[X86][AArch64][NFC] Add tests for masked merge unfolding

[lebedev.ri]

Summary

This is PR37104.

PR6773 will introduce an IR canonicalization that is likely bad for the end assembly.
Previously, andl+andn/andps+andnps / bic/bsl would be generated. (see @out)
Now, they would no longer be generated (see @in).
I'm guessing llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp should be able to unfold this.

[lebedev.ri]

Added some more tests with constant mask, for a good measure.
Not sure if they are of much use, or whether that is too much?

[lebedev.ri]

Right, i can drop half of the x86 output if i split it into scalar and vector files.

[lebedev.ri]

Split x86 testcase into scalar and vector files, halving amount of RUN-lines in each of them.

[lebedev.ri]

Actually test aarch64 in aarch64 test file, oops.

[lebedev.ri]

Need to think more about the patterns/tests. Not needed *yet* anyway.

[spatel]

Don't know what changes are planned here, but this is on the right track. We want to have coverage of the possible canonical IR variations for various targets.

PowerPC with Altivec has a vsel instruction if you want even more coverage, but I don't think the PPC backend has the isel pattern-matching logic to produce that currently (cc @nemanjai).

test/CodeGen/X86/unfold-masked-merge-vector.ll

2 ↗

(On Diff #142177)

Not sure this RUN adds much value - I think SSE is required by the x86-64 ABI, so we may already be in undefined territory with these tests. :)

A target with -mattr=avx may be slightly more interesting, but there might not be enough ISA difference there to even make that worthwhile.

[lebedev.ri]

In D45563#1069916, @spatel wrote:

Don't know what changes are planned here, but this is on the right track. We want to have coverage of the possible canonical IR variations for various targets.

I'm working on that right now, got it working, maybe will update this + post the dagcombiner part (that is where i should have put it, right?) in a few hours.

PowerPC with Altivec has a vsel instruction if you want even more coverage, but I don't think the PPC backend has the isel pattern-matching logic to produce that currently (cc @nemanjai).

Downside: i dropped vector tests for now, only only handle scalars for now.

[spatel]

In D45563#1069922, @lebedev.ri wrote:

In D45563#1069916, @spatel wrote:

Don't know what changes are planned here, but this is on the right track. We want to have coverage of the possible canonical IR variations for various targets.

I'm working on that right now, got it working, maybe will update this + post the dagcombiner part (that is where i should have put it, right?) in a few hours.

Yes, this will be in DAGCombiner.

PowerPC with Altivec has a vsel instruction if you want even more coverage, but I don't think the PPC backend has the isel pattern-matching logic to produce that currently (cc @nemanjai).

Downside: i dropped vector tests for now, only only handle scalars for now.

That's actually preferred. Small steps - easier to review and fix when the bug reports come in. :)

[nemanjai]

In D45563#1069916, @spatel wrote:

Don't know what changes are planned here, but this is on the right track. We want to have coverage of the possible canonical IR variations for various targets.

PowerPC with Altivec has a vsel instruction if you want even more coverage, but I don't think the PPC backend has the isel pattern-matching logic to produce that currently (cc @nemanjai).

Not sure this answer is pertinent any longer, but on PPC we can generate the VSX version of the vector select (xxsel) for rather specific situations. See test/CodeGen/PowerPC/vselect-constants.ll and test/CodeGen/PowerPC/vsx.ll.

[spatel]

In D45563#1069968, @nemanjai wrote:

In D45563#1069916, @spatel wrote:

Not sure this answer is pertinent any longer, but on PPC we can generate the VSX version of the vector select (xxsel) for rather specific situations. See test/CodeGen/PowerPC/vselect-constants.ll and test/CodeGen/PowerPC/vsx.ll.

I think it's still valid. Didn't mean to be cryptic - here's the vector example from this patch compiled for PPC64le:

define <4 x i32> @out_vec(<4 x i32> %x, <4 x i32> %y, <4 x i32> %mask) {
  %mx = and <4 x i32> %x, %mask
  %notmask = xor <4 x i32> %mask, <i32 -1, i32 -1, i32 -1, i32 -1>
  %my = and <4 x i32> %y, %notmask
  %r = or <4 x i32> %mx, %my
  ret <4 x i32> %r
}

$ ./llc -o - vsel.ll -mtriple=powerpc64le
xxland 0, 34, 36
xxlandc 1, 35, 36
xxlor 34, 0, 1
blr

xxsel 0, 35, 34, 36 ?

[nemanjai]

In D45563#1069984, @spatel wrote:

...
$ ./llc -o - vsel.ll -mtriple=powerpc64le
xxland 0, 34, 36
xxlandc 1, 35, 36
xxlor 34, 0, 1
blr

xxsel 0, 35, 34, 36 ?

Yes.

[lebedev.ri]

Revised tests, dropped vectors for now.

[spatel]

test/CodeGen/AArch64/unfold-masked-merge-scalar.ll

454–457 ↗

(On Diff #142807)

If you mark functions with 'nounwind', it should remove the cfi noise.

[lebedev.ri]

test/CodeGen/AArch64/unfold-masked-merge-scalar.ll

454–457 ↗

(On Diff #142807)

Does not work for aarch64, and i'd prefer to keep it consistent.

[lebedev.ri]

Revisited tests once, more, added some more complex patterns (with non-trivial 'y' and/or 'm'), that i expect could be failed to be matched.

[spatel]

test/CodeGen/AArch64/unfold-masked-merge-scalar.ll

454–457 ↗

(On Diff #142807)

By 'does not work', you mean the script wasn't working, right? Can you try again after:
rL330453

Hopefully, we can get rid of the cfi noise for both targets now.

Note that there's little consistency between targets, but I appreciate that goal (the vast majority of AArch tests don't have auto-generated checks).

[lebedev.ri]

Get rid of CFI noise now that it is possibe after rL330453.

test/CodeGen/AArch64/unfold-masked-merge-scalar.ll

454–457 ↗

(On Diff #142807)

Thank you, that was it!

[spatel]

LGTM. You could increase diversity in the constant mask tests by not using a single-string-of-set-bits constant (eg 0x0f0f0f0f instead of 0x0000ffff).

[lebedev.ri]

In D45563#1074051, @spatel wrote:

LGTM. You could increase diversity in the constant mask tests by not using a single-string-of-set-bits constant (eg 0x0f0f0f0f instead of 0x0000ffff).

But since we don't do anything (not fold, not unfold) with these patterns
with constant masks, is there any point in adding even more tests?

[spatel]

In D45563#1074387, @lebedev.ri wrote:

In D45563#1074051, @spatel wrote:

LGTM. You could increase diversity in the constant mask tests by not using a single-string-of-set-bits constant (eg 0x0f0f0f0f instead of 0x0000ffff).

But since we don't do anything (not fold, not unfold) with these patterns
with constant masks, is there any point in adding even more tests?

I wouldn't add more tests, but different constants might show the variety of codegen options that AArch is using on these sequences (x86 probably has no differences in that respect?).

[lebedev.ri]

Split tests with variable mask and constant mask into separate files, add a bit more tests with different constant mask patterns.

llvm/trunk/test/CodeGen/AArch64/unfold-masked-merge-scalar-constmask-innerouter.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
+
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+; X: [byte3]              [byte0]
+; Y:        [byte2][byte1]
+
+define i8 @out8_constmask(i8 %x, i8 %y) {
+; CHECK-LABEL: out8_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    lsr w8, w0, #2
+; CHECK-NEXT:    bfi w1, w8, #2, #4
+; CHECK-NEXT:    mov w0, w1
+; CHECK-NEXT:    ret
+  %mx = and i8 %x, 60
+  %my = and i8 %y, -61
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16_constmask(i16 %x, i16 %y) {
+; CHECK-LABEL: out16_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    lsr w8, w0, #4
+; CHECK-NEXT:    bfi w1, w8, #4, #8
+; CHECK-NEXT:    mov w0, w1
+; CHECK-NEXT:    ret
+  %mx = and i16 %x, 4080
+  %my = and i16 %y, -4081
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32_constmask(i32 %x, i32 %y) {
+; CHECK-LABEL: out32_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    lsr w8, w0, #8
+; CHECK-NEXT:    bfi w1, w8, #8, #16
+; CHECK-NEXT:    mov w0, w1
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, 16776960
+  %my = and i32 %y, -16776961
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64_constmask(i64 %x, i64 %y) {
+; CHECK-LABEL: out64_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    lsr x8, x0, #16
+; CHECK-NEXT:    bfi x1, x8, #16, #32
+; CHECK-NEXT:    mov x0, x1
+; CHECK-NEXT:    ret
+  %mx = and i64 %x, 281474976645120
+  %my = and i64 %y, -281474976645121
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8_constmask(i8 %x, i8 %y) {
+; CHECK-LABEL: in8_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0x3c
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, 60
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16_constmask(i16 %x, i16 %y) {
+; CHECK-LABEL: in16_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xff0
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, 4080
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32_constmask(i32 %x, i32 %y) {
+; CHECK-LABEL: in32_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff00
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64_constmask(i64 %x, i64 %y) {
+; CHECK-LABEL: in64_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor x8, x0, x1
+; CHECK-NEXT:    and x8, x8, #0xffffffff0000
+; CHECK-NEXT:    eor x0, x8, x1
+; CHECK-NEXT:    ret
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, 281474976645120
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+
+; ============================================================================ ;
+; Constant Commutativity tests.
+; ============================================================================ ;
+
+define i32 @in_constmask_commutativity_0_1(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_0_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff00
+; CHECK-NEXT:    eor w0, w1, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_0(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_1_0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff00
+; CHECK-NEXT:    eor w0, w8, w0
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_1(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_1_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff00
+; CHECK-NEXT:    eor w0, w0, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+
+define i32 @in_complex_y0_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-LABEL: in_complex_y0_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, #0xffff00
+; CHECK-NEXT:    eor w0, w9, w8
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_complex_y1_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-LABEL: in_complex_y1_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, #0xffff00
+; CHECK-NEXT:    eor w0, w8, w9
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+
+; Multi-use tests.
+
+declare void @use32(i32) nounwind
+
+define i32 @in_multiuse_A_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-LABEL: in_multiuse_A_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w20, w8, #0xffff00
+; CHECK-NEXT:    mov w0, w20
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_multiuse_B_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-LABEL: in_multiuse_B_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w0, w0, w1
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    and w20, w0, #0xffff00
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+; Various bad variants
+
+define i32 @n0_badconstmask(i32 %x, i32 %y) {
+; CHECK-LABEL: n0_badconstmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w9, #256
+; CHECK-NEXT:    movk w9, #65280, lsl #16
+; CHECK-NEXT:    and w8, w0, #0xffff00
+; CHECK-NEXT:    and w9, w1, w9
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, 16776960
+  %my = and i32 %y, -16776960 ; instead of -16776961
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i32 @n1_thirdvar_constmask(i32 %x, i32 %y, i32 %z) {
+; CHECK-LABEL: n1_thirdvar_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff00
+; CHECK-NEXT:    eor w0, w8, w2
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}

llvm/trunk/test/CodeGen/AArch64/unfold-masked-merge-scalar-constmask-interleavedbits.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
+
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+; X:       [bit2]      [bit0]
+; Y: [bit3]      [bit1]
+
+define i8 @out8_constmask(i8 %x, i8 %y) {
+; CHECK-LABEL: out8_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w8, #85
+; CHECK-NEXT:    mov w9, #-86
+; CHECK-NEXT:    and w8, w0, w8
+; CHECK-NEXT:    and w9, w1, w9
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i8 %x, 85
+  %my = and i8 %y, -86
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16_constmask(i16 %x, i16 %y) {
+; CHECK-LABEL: out16_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w8, #21845
+; CHECK-NEXT:    mov w9, #-21846
+; CHECK-NEXT:    and w8, w0, w8
+; CHECK-NEXT:    and w9, w1, w9
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i16 %x, 21845
+  %my = and i16 %y, -21846
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32_constmask(i32 %x, i32 %y) {
+; CHECK-LABEL: out32_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w0, #0x55555555
+; CHECK-NEXT:    and w9, w1, #0xaaaaaaaa
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, 1431655765
+  %my = and i32 %y, -1431655766
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64_constmask(i64 %x, i64 %y) {
+; CHECK-LABEL: out64_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and x8, x0, #0x5555555555555555
+; CHECK-NEXT:    and x9, x1, #0xaaaaaaaaaaaaaaaa
+; CHECK-NEXT:    orr x0, x8, x9
+; CHECK-NEXT:    ret
+  %mx = and i64 %x, 6148914691236517205
+  %my = and i64 %y, -6148914691236517206
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8_constmask(i8 %x, i8 %y) {
+; CHECK-LABEL: in8_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    mov w9, #85
+; CHECK-NEXT:    and w8, w8, w9
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, 85
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16_constmask(i16 %x, i16 %y) {
+; CHECK-LABEL: in16_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    mov w9, #21845
+; CHECK-NEXT:    and w8, w8, w9
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, 21845
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32_constmask(i32 %x, i32 %y) {
+; CHECK-LABEL: in32_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0x55555555
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64_constmask(i64 %x, i64 %y) {
+; CHECK-LABEL: in64_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor x8, x0, x1
+; CHECK-NEXT:    and x8, x8, #0x5555555555555555
+; CHECK-NEXT:    eor x0, x8, x1
+; CHECK-NEXT:    ret
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, 6148914691236517205
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+
+; ============================================================================ ;
+; Constant Commutativity tests.
+; ============================================================================ ;
+
+define i32 @in_constmask_commutativity_0_1(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_0_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0x55555555
+; CHECK-NEXT:    eor w0, w1, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_0(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_1_0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0x55555555
+; CHECK-NEXT:    eor w0, w8, w0
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_1(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_1_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0x55555555
+; CHECK-NEXT:    eor w0, w0, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+
+define i32 @in_complex_y0_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-LABEL: in_complex_y0_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, #0x55555555
+; CHECK-NEXT:    eor w0, w9, w8
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_complex_y1_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-LABEL: in_complex_y1_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, #0x55555555
+; CHECK-NEXT:    eor w0, w8, w9
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+
+; Multi-use tests.
+
+declare void @use32(i32) nounwind
+
+define i32 @in_multiuse_A_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-LABEL: in_multiuse_A_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w20, w8, #0x55555555
+; CHECK-NEXT:    mov w0, w20
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_multiuse_B_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-LABEL: in_multiuse_B_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w0, w0, w1
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    and w20, w0, #0x55555555
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+; Various bad variants
+
+define i32 @n0_badconstmask(i32 %x, i32 %y) {
+; CHECK-LABEL: n0_badconstmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w9, #43691
+; CHECK-NEXT:    movk w9, #43690, lsl #16
+; CHECK-NEXT:    and w8, w0, #0x55555555
+; CHECK-NEXT:    and w9, w1, w9
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, 1431655765
+  %my = and i32 %y, -1431655765 ; instead of -1431655766
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i32 @n1_thirdvar_constmask(i32 %x, i32 %y, i32 %z) {
+; CHECK-LABEL: n1_thirdvar_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0x55555555
+; CHECK-NEXT:    eor w0, w8, w2
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}

llvm/trunk/test/CodeGen/AArch64/unfold-masked-merge-scalar-constmask-interleavedbytehalves.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
+
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+; X:           [bit 3210]
+; Y: [bit 7654]
+
+define i8 @out8_constmask(i8 %x, i8 %y) {
+; CHECK-LABEL: out8_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    bfxil w1, w0, #0, #4
+; CHECK-NEXT:    mov w0, w1
+; CHECK-NEXT:    ret
+  %mx = and i8 %x, 15
+  %my = and i8 %y, -16
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16_constmask(i16 %x, i16 %y) {
+; CHECK-LABEL: out16_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w8, #3855
+; CHECK-NEXT:    mov w9, #-3856
+; CHECK-NEXT:    and w8, w0, w8
+; CHECK-NEXT:    and w9, w1, w9
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i16 %x, 3855
+  %my = and i16 %y, -3856
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32_constmask(i32 %x, i32 %y) {
+; CHECK-LABEL: out32_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w0, #0xf0f0f0f
+; CHECK-NEXT:    and w9, w1, #0xf0f0f0f0
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, 252645135
+  %my = and i32 %y, -252645136
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64_constmask(i64 %x, i64 %y) {
+; CHECK-LABEL: out64_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and x8, x0, #0xf0f0f0f0f0f0f0f
+; CHECK-NEXT:    and x9, x1, #0xf0f0f0f0f0f0f0f0
+; CHECK-NEXT:    orr x0, x8, x9
+; CHECK-NEXT:    ret
+  %mx = and i64 %x, 1085102592571150095
+  %my = and i64 %y, -1085102592571150096
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8_constmask(i8 %x, i8 %y) {
+; CHECK-LABEL: in8_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xf
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, 15
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16_constmask(i16 %x, i16 %y) {
+; CHECK-LABEL: in16_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    mov w9, #3855
+; CHECK-NEXT:    and w8, w8, w9
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, 3855
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32_constmask(i32 %x, i32 %y) {
+; CHECK-LABEL: in32_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xf0f0f0f
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64_constmask(i64 %x, i64 %y) {
+; CHECK-LABEL: in64_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor x8, x0, x1
+; CHECK-NEXT:    and x8, x8, #0xf0f0f0f0f0f0f0f
+; CHECK-NEXT:    eor x0, x8, x1
+; CHECK-NEXT:    ret
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, 1085102592571150095
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+
+; ============================================================================ ;
+; Constant Commutativity tests.
+; ============================================================================ ;
+
+define i32 @in_constmask_commutativity_0_1(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_0_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xf0f0f0f
+; CHECK-NEXT:    eor w0, w1, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_0(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_1_0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xf0f0f0f
+; CHECK-NEXT:    eor w0, w8, w0
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_1(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_1_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xf0f0f0f
+; CHECK-NEXT:    eor w0, w0, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+
+define i32 @in_complex_y0_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-LABEL: in_complex_y0_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, #0xf0f0f0f
+; CHECK-NEXT:    eor w0, w9, w8
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_complex_y1_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-LABEL: in_complex_y1_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, #0xf0f0f0f
+; CHECK-NEXT:    eor w0, w8, w9
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+
+; Multi-use tests.
+
+declare void @use32(i32) nounwind
+
+define i32 @in_multiuse_A_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-LABEL: in_multiuse_A_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w20, w8, #0xf0f0f0f
+; CHECK-NEXT:    mov w0, w20
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_multiuse_B_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-LABEL: in_multiuse_B_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w0, w0, w1
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    and w20, w0, #0xf0f0f0f
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+; Various bad variants
+
+define i32 @n0_badconstmask(i32 %x, i32 %y) {
+; CHECK-LABEL: n0_badconstmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    mov w9, #61681
+; CHECK-NEXT:    movk w9, #61680, lsl #16
+; CHECK-NEXT:    and w8, w0, #0xf0f0f0f
+; CHECK-NEXT:    and w9, w1, w9
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, 252645135
+  %my = and i32 %y, -252645135 ; instead of -252645136
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i32 @n1_thirdvar_constmask(i32 %x, i32 %y, i32 %z) {
+; CHECK-LABEL: n1_thirdvar_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xf0f0f0f
+; CHECK-NEXT:    eor w0, w8, w2
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}

llvm/trunk/test/CodeGen/AArch64/unfold-masked-merge-scalar-constmask-lowhigh.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
+
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+; X:               [byte1][byte0]
+; Y: [byte3][byte2]
+
+define i8 @out8_constmask(i8 %x, i8 %y) {
+; CHECK-LABEL: out8_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    bfxil w1, w0, #0, #4
+; CHECK-NEXT:    mov w0, w1
+; CHECK-NEXT:    ret
+  %mx = and i8 %x, 15
+  %my = and i8 %y, -16
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16_constmask(i16 %x, i16 %y) {
+; CHECK-LABEL: out16_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    bfxil w1, w0, #0, #8
+; CHECK-NEXT:    mov w0, w1
+; CHECK-NEXT:    ret
+  %mx = and i16 %x, 255
+  %my = and i16 %y, -256
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32_constmask(i32 %x, i32 %y) {
+; CHECK-LABEL: out32_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    bfxil w1, w0, #0, #16
+; CHECK-NEXT:    mov w0, w1
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, 65535
+  %my = and i32 %y, -65536
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64_constmask(i64 %x, i64 %y) {
+; CHECK-LABEL: out64_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    bfxil x1, x0, #0, #32
+; CHECK-NEXT:    mov x0, x1
+; CHECK-NEXT:    ret
+  %mx = and i64 %x, 4294967295
+  %my = and i64 %y, -4294967296
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8_constmask(i8 %x, i8 %y) {
+; CHECK-LABEL: in8_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xf
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, 15
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16_constmask(i16 %x, i16 %y) {
+; CHECK-LABEL: in16_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xff
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, 255
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32_constmask(i32 %x, i32 %y) {
+; CHECK-LABEL: in32_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64_constmask(i64 %x, i64 %y) {
+; CHECK-LABEL: in64_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    eor x0, x8, x1
+; CHECK-NEXT:    ret
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, 4294967295
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+
+; ============================================================================ ;
+; Constant Commutativity tests.
+; ============================================================================ ;
+
+define i32 @in_constmask_commutativity_0_1(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_0_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff
+; CHECK-NEXT:    eor w0, w1, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_0(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_1_0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff
+; CHECK-NEXT:    eor w0, w8, w0
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_1(i32 %x, i32 %y) {
+; CHECK-LABEL: in_constmask_commutativity_1_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff
+; CHECK-NEXT:    eor w0, w0, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+
+define i32 @in_complex_y0_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-LABEL: in_complex_y0_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, #0xffff
+; CHECK-NEXT:    eor w0, w9, w8
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_complex_y1_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-LABEL: in_complex_y1_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, #0xffff
+; CHECK-NEXT:    eor w0, w8, w9
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+
+; Multi-use tests.
+
+declare void @use32(i32) nounwind
+
+define i32 @in_multiuse_A_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-LABEL: in_multiuse_A_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w20, w8, #0xffff
+; CHECK-NEXT:    mov w0, w20
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_multiuse_B_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-LABEL: in_multiuse_B_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w0, w0, w1
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    and w20, w0, #0xffff
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+; Various bad variants
+
+define i32 @n0_badconstmask(i32 %x, i32 %y) {
+; CHECK-LABEL: n0_badconstmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w0, #0xffff
+; CHECK-NEXT:    and w9, w1, #0xffff0001
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, 65535
+  %my = and i32 %y, -65535 ; instead of -65536
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i32 @n1_thirdvar_constmask(i32 %x, i32 %y, i32 %z) {
+; CHECK-LABEL: n1_thirdvar_constmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, #0xffff
+; CHECK-NEXT:    eor w0, w8, w2
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}

llvm/trunk/test/CodeGen/AArch64/unfold-masked-merge-scalar-variablemask.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
+
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+define i8 @out8(i8 %x, i8 %y, i8 %mask) {
+; CHECK-LABEL: out8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w0, w2
+; CHECK-NEXT:    bic w9, w1, w2
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i8 %x, %mask
+  %notmask = xor i8 %mask, -1
+  %my = and i8 %y, %notmask
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16(i16 %x, i16 %y, i16 %mask) {
+; CHECK-LABEL: out16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w0, w2
+; CHECK-NEXT:    bic w9, w1, w2
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i16 %x, %mask
+  %notmask = xor i16 %mask, -1
+  %my = and i16 %y, %notmask
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: out32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w0, w2
+; CHECK-NEXT:    bic w9, w1, w2
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, %mask
+  %notmask = xor i32 %mask, -1
+  %my = and i32 %y, %notmask
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64(i64 %x, i64 %y, i64 %mask) {
+; CHECK-LABEL: out64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and x8, x0, x2
+; CHECK-NEXT:    bic x9, x1, x2
+; CHECK-NEXT:    orr x0, x8, x9
+; CHECK-NEXT:    ret
+  %mx = and i64 %x, %mask
+  %notmask = xor i64 %mask, -1
+  %my = and i64 %y, %notmask
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8(i8 %x, i8 %y, i8 %mask) {
+; CHECK-LABEL: in8:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, w2
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, %mask
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16(i16 %x, i16 %y, i16 %mask) {
+; CHECK-LABEL: in16:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, w2
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, %mask
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: in32:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, w2
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64(i64 %x, i64 %y, i64 %mask) {
+; CHECK-LABEL: in64:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor x8, x0, x1
+; CHECK-NEXT:    and x8, x8, x2
+; CHECK-NEXT:    eor x0, x8, x1
+; CHECK-NEXT:    ret
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, %mask
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+; ============================================================================ ;
+; Commutativity tests.
+; ============================================================================ ;
+define i32 @in_commutativity_0_0_1(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: in_commutativity_0_0_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w2, w8
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0 ; swapped
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_commutativity_0_1_0(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: in_commutativity_0_1_0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, w2
+; CHECK-NEXT:    eor w0, w1, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+define i32 @in_commutativity_0_1_1(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: in_commutativity_0_1_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w2, w8
+; CHECK-NEXT:    eor w0, w1, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0 ; swapped
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+define i32 @in_commutativity_1_0_0(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: in_commutativity_1_0_0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, w2
+; CHECK-NEXT:    eor w0, w8, w0
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+define i32 @in_commutativity_1_0_1(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: in_commutativity_1_0_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w2, w8
+; CHECK-NEXT:    eor w0, w8, w0
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0 ; swapped
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+define i32 @in_commutativity_1_1_0(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: in_commutativity_1_1_0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, w2
+; CHECK-NEXT:    eor w0, w0, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+define i32 @in_commutativity_1_1_1(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: in_commutativity_1_1_1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w2, w8
+; CHECK-NEXT:    eor w0, w0, w8
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0 ; swapped
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+define i32 @in_complex_y0(i32 %x, i32 %y_hi, i32 %y_low, i32 %mask) {
+; CHECK-LABEL: in_complex_y0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, w3
+; CHECK-NEXT:    eor w0, w9, w8
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_complex_y1(i32 %x, i32 %y_hi, i32 %y_low, i32 %mask) {
+; CHECK-LABEL: in_complex_y1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w0, w8
+; CHECK-NEXT:    and w9, w9, w3
+; CHECK-NEXT:    eor w0, w8, w9
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+; ============================================================================ ;
+; M is an 'xor' too.
+; ============================================================================ ;
+define i32 @in_complex_m0(i32 %x, i32 %y, i32 %m_a, i32 %m_b) {
+; CHECK-LABEL: in_complex_m0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w2, w3
+; CHECK-NEXT:    eor w9, w0, w1
+; CHECK-NEXT:    and w8, w9, w8
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_complex_m1(i32 %x, i32 %y, i32 %m_a, i32 %m_b) {
+; CHECK-LABEL: in_complex_m1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w2, w3
+; CHECK-NEXT:    eor w9, w0, w1
+; CHECK-NEXT:    and w8, w8, w9
+; CHECK-NEXT:    eor w0, w8, w1
+; CHECK-NEXT:    ret
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+; ============================================================================ ;
+; Both Y and M are complex.
+; ============================================================================ ;
+define i32 @in_complex_y0_m0(i32 %x, i32 %y_hi, i32 %y_low, i32 %m_a, i32 %m_b) {
+; CHECK-LABEL: in_complex_y0_m0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w3, w4
+; CHECK-NEXT:    eor w10, w0, w8
+; CHECK-NEXT:    and w9, w10, w9
+; CHECK-NEXT:    eor w0, w9, w8
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_complex_y1_m0(i32 %x, i32 %y_hi, i32 %y_low, i32 %m_a, i32 %m_b) {
+; CHECK-LABEL: in_complex_y1_m0:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w3, w4
+; CHECK-NEXT:    eor w10, w0, w8
+; CHECK-NEXT:    and w9, w10, w9
+; CHECK-NEXT:    eor w0, w8, w9
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+define i32 @in_complex_y0_m1(i32 %x, i32 %y_hi, i32 %y_low, i32 %m_a, i32 %m_b) {
+; CHECK-LABEL: in_complex_y0_m1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w3, w4
+; CHECK-NEXT:    eor w10, w0, w8
+; CHECK-NEXT:    and w9, w9, w10
+; CHECK-NEXT:    eor w0, w9, w8
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_complex_y1_m1(i32 %x, i32 %y_hi, i32 %y_low, i32 %m_a, i32 %m_b) {
+; CHECK-LABEL: in_complex_y1_m1:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w1, w2
+; CHECK-NEXT:    eor w9, w3, w4
+; CHECK-NEXT:    eor w10, w0, w8
+; CHECK-NEXT:    and w9, w9, w10
+; CHECK-NEXT:    eor w0, w8, w9
+; CHECK-NEXT:    ret
+  %y = and i32 %y_hi, %y_low
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+; Multi-use tests.
+declare void @use32(i32) nounwind
+define i32 @in_multiuse_A(i32 %x, i32 %y, i32 %z, i32 %mask) nounwind {
+; CHECK-LABEL: in_multiuse_A:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w20, w8, w3
+; CHECK-NEXT:    mov w0, w20
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_multiuse_B(i32 %x, i32 %y, i32 %z, i32 %mask) nounwind {
+; CHECK-LABEL: in_multiuse_B:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    str x20, [sp, #-32]! // 8-byte Folded Spill
+; CHECK-NEXT:    eor w0, w0, w1
+; CHECK-NEXT:    stp x19, x30, [sp, #16] // 8-byte Folded Spill
+; CHECK-NEXT:    mov w19, w1
+; CHECK-NEXT:    and w20, w0, w3
+; CHECK-NEXT:    bl use32
+; CHECK-NEXT:    eor w0, w20, w19
+; CHECK-NEXT:    ldp x19, x30, [sp, #16] // 8-byte Folded Reload
+; CHECK-NEXT:    ldr x20, [sp], #32 // 8-byte Folded Reload
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+; Various bad variants
+define i32 @n0_badmask(i32 %x, i32 %y, i32 %mask, i32 %mask2) {
+; CHECK-LABEL: n0_badmask:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    and w8, w0, w2
+; CHECK-NEXT:    bic w9, w1, w3
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, %mask
+  %notmask = xor i32 %mask2, -1 ; %mask2 instead of %mask
+  %my = and i32 %y, %notmask
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+define i32 @n0_badxor(i32 %x, i32 %y, i32 %mask) {
+; CHECK-LABEL: n0_badxor:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w9, w2, #0x1
+; CHECK-NEXT:    and w8, w0, w2
+; CHECK-NEXT:    and w9, w1, w9
+; CHECK-NEXT:    orr w0, w8, w9
+; CHECK-NEXT:    ret
+  %mx = and i32 %x, %mask
+  %notmask = xor i32 %mask, 1 ; instead of -1
+  %my = and i32 %y, %notmask
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+define i32 @n1_thirdvar(i32 %x, i32 %y, i32 %z, i32 %mask) {
+; CHECK-LABEL: n1_thirdvar:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    eor w8, w0, w1
+; CHECK-NEXT:    and w8, w8, w3
+; CHECK-NEXT:    eor w0, w8, w2
+; CHECK-NEXT:    ret
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}

llvm/trunk/test/CodeGen/X86/unfold-masked-merge-scalar-constmask-innerouter.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=-bmi < %s | FileCheck %s --check-prefix=CHECK-NOBMI
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi < %s | FileCheck %s --check-prefix=CHECK-BMI
+
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+; X: [byte3]              [byte0]
+; Y:        [byte2][byte1]
+
+define i8 @out8_constmask(i8 %x, i8 %y) {
+; CHECK-NOBMI-LABEL: out8_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andb $60, %dil
+; CHECK-NOBMI-NEXT:    andb $-61, %sil
+; CHECK-NOBMI-NEXT:    orb %dil, %sil
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out8_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andb $60, %dil
+; CHECK-BMI-NEXT:    andb $-61, %sil
+; CHECK-BMI-NEXT:    orb %dil, %sil
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i8 %x, 60
+  %my = and i8 %y, -61
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16_constmask(i16 %x, i16 %y) {
+; CHECK-NOBMI-LABEL: out16_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-NOBMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-NOBMI-NEXT:    andl $4080, %edi # imm = 0xFF0
+; CHECK-NOBMI-NEXT:    andl $-4081, %esi # imm = 0xF00F
+; CHECK-NOBMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-NOBMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out16_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-BMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-BMI-NEXT:    andl $4080, %edi # imm = 0xFF0
+; CHECK-BMI-NEXT:    andl $-4081, %esi # imm = 0xF00F
+; CHECK-BMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-BMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i16 %x, 4080
+  %my = and i16 %y, -4081
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32_constmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: out32_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-NOBMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-NOBMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    andl $-16776961, %esi # imm = 0xFF0000FF
+; CHECK-NOBMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out32_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-BMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-BMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    andl $-16776961, %esi # imm = 0xFF0000FF
+; CHECK-BMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, 16776960
+  %my = and i32 %y, -16776961
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64_constmask(i64 %x, i64 %y) {
+; CHECK-NOBMI-LABEL: out64_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    movabsq $281474976645120, %rcx # imm = 0xFFFFFFFF0000
+; CHECK-NOBMI-NEXT:    andq %rdi, %rcx
+; CHECK-NOBMI-NEXT:    movabsq $-281474976645121, %rax # imm = 0xFFFF00000000FFFF
+; CHECK-NOBMI-NEXT:    andq %rsi, %rax
+; CHECK-NOBMI-NEXT:    orq %rcx, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out64_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    movabsq $281474976645120, %rcx # imm = 0xFFFFFFFF0000
+; CHECK-BMI-NEXT:    andq %rdi, %rcx
+; CHECK-BMI-NEXT:    movabsq $-281474976645121, %rax # imm = 0xFFFF00000000FFFF
+; CHECK-BMI-NEXT:    andq %rsi, %rax
+; CHECK-BMI-NEXT:    orq %rcx, %rax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i64 %x, 281474976645120
+  %my = and i64 %y, -281474976645121
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8_constmask(i8 %x, i8 %y) {
+; CHECK-NOBMI-LABEL: in8_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andb $60, %dil
+; CHECK-NOBMI-NEXT:    xorb %dil, %sil
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in8_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andb $60, %dil
+; CHECK-BMI-NEXT:    xorb %dil, %sil
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, 60
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16_constmask(i16 %x, i16 %y) {
+; CHECK-NOBMI-LABEL: in16_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $4080, %edi # imm = 0xFF0
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in16_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $4080, %edi # imm = 0xFF0
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, 4080
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32_constmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in32_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in32_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64_constmask(i64 %x, i64 %y) {
+; CHECK-NOBMI-LABEL: in64_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorq %rsi, %rdi
+; CHECK-NOBMI-NEXT:    movabsq $281474976645120, %rax # imm = 0xFFFFFFFF0000
+; CHECK-NOBMI-NEXT:    andq %rdi, %rax
+; CHECK-NOBMI-NEXT:    xorq %rsi, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in64_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorq %rsi, %rdi
+; CHECK-BMI-NEXT:    movabsq $281474976645120, %rax # imm = 0xFFFFFFFF0000
+; CHECK-BMI-NEXT:    andq %rdi, %rax
+; CHECK-BMI-NEXT:    xorq %rsi, %rax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, 281474976645120
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+
+; ============================================================================ ;
+; Constant Commutativity tests.
+; ============================================================================ ;
+
+define i32 @in_constmask_commutativity_0_1(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_0_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_0_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_0(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_1_0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl $16776960, %esi # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_1_0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl $16776960, %esi # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_1(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_1_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl $16776960, %esi # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_1_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl $16776960, %esi # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+
+define i32 @in_complex_y0_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-NOBMI-LABEL: in_complex_y0_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y0_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_complex_y1_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-NOBMI-LABEL: in_complex_y1_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y1_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+
+; Multi-use tests.
+
+declare void @use32(i32) nounwind
+
+define i32 @in_multiuse_A_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_A_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %esi, %ebx
+; CHECK-NOBMI-NEXT:    movl %edi, %ebp
+; CHECK-NOBMI-NEXT:    xorl %esi, %ebp
+; CHECK-NOBMI-NEXT:    andl $16776960, %ebp # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    movl %ebp, %edi
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_A_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %esi, %ebx
+; CHECK-BMI-NEXT:    movl %edi, %ebp
+; CHECK-BMI-NEXT:    xorl %esi, %ebp
+; CHECK-BMI-NEXT:    andl $16776960, %ebp # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    movl %ebp, %edi
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_multiuse_B_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_B_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %esi, %ebx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %ebp
+; CHECK-NOBMI-NEXT:    andl $16776960, %ebp # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_B_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %esi, %ebx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %ebp
+; CHECK-BMI-NEXT:    andl $16776960, %ebp # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+; Various bad variants
+
+define i32 @n0_badconstmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: n0_badconstmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    andl $-16776960, %esi # imm = 0xFF000100
+; CHECK-NOBMI-NEXT:    orl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n0_badconstmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    andl $-16776960, %esi # imm = 0xFF000100
+; CHECK-BMI-NEXT:    orl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, 16776960
+  %my = and i32 %y, -16776960 ; instead of -16776961
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i32 @n1_thirdvar_constmask(i32 %x, i32 %y, i32 %z) {
+; CHECK-NOBMI-LABEL: n1_thirdvar_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-NOBMI-NEXT:    xorl %edx, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n1_thirdvar_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $16776960, %edi # imm = 0xFFFF00
+; CHECK-BMI-NEXT:    xorl %edx, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 16776960
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}

llvm/trunk/test/CodeGen/X86/unfold-masked-merge-scalar-constmask-interleavedbits.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=-bmi < %s | FileCheck %s --check-prefix=CHECK-NOBMI
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi < %s | FileCheck %s --check-prefix=CHECK-BMI
+
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+; X:       [bit2]      [bit0]
+; Y: [bit3]      [bit1]
+
+define i8 @out8_constmask(i8 %x, i8 %y) {
+; CHECK-NOBMI-LABEL: out8_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andb $85, %dil
+; CHECK-NOBMI-NEXT:    andb $-86, %sil
+; CHECK-NOBMI-NEXT:    orb %dil, %sil
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out8_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andb $85, %dil
+; CHECK-BMI-NEXT:    andb $-86, %sil
+; CHECK-BMI-NEXT:    orb %dil, %sil
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i8 %x, 85
+  %my = and i8 %y, -86
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16_constmask(i16 %x, i16 %y) {
+; CHECK-NOBMI-LABEL: out16_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-NOBMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-NOBMI-NEXT:    andl $21845, %edi # imm = 0x5555
+; CHECK-NOBMI-NEXT:    andl $-21846, %esi # imm = 0xAAAA
+; CHECK-NOBMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-NOBMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out16_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-BMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-BMI-NEXT:    andl $21845, %edi # imm = 0x5555
+; CHECK-BMI-NEXT:    andl $-21846, %esi # imm = 0xAAAA
+; CHECK-BMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-BMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i16 %x, 21845
+  %my = and i16 %y, -21846
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32_constmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: out32_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-NOBMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-NOBMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    andl $-1431655766, %esi # imm = 0xAAAAAAAA
+; CHECK-NOBMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out32_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-BMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-BMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-BMI-NEXT:    andl $-1431655766, %esi # imm = 0xAAAAAAAA
+; CHECK-BMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, 1431655765
+  %my = and i32 %y, -1431655766
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64_constmask(i64 %x, i64 %y) {
+; CHECK-NOBMI-LABEL: out64_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    movabsq $6148914691236517205, %rcx # imm = 0x5555555555555555
+; CHECK-NOBMI-NEXT:    andq %rdi, %rcx
+; CHECK-NOBMI-NEXT:    movabsq $-6148914691236517206, %rax # imm = 0xAAAAAAAAAAAAAAAA
+; CHECK-NOBMI-NEXT:    andq %rsi, %rax
+; CHECK-NOBMI-NEXT:    orq %rcx, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out64_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    movabsq $6148914691236517205, %rcx # imm = 0x5555555555555555
+; CHECK-BMI-NEXT:    andq %rdi, %rcx
+; CHECK-BMI-NEXT:    movabsq $-6148914691236517206, %rax # imm = 0xAAAAAAAAAAAAAAAA
+; CHECK-BMI-NEXT:    andq %rsi, %rax
+; CHECK-BMI-NEXT:    orq %rcx, %rax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i64 %x, 6148914691236517205
+  %my = and i64 %y, -6148914691236517206
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8_constmask(i8 %x, i8 %y) {
+; CHECK-NOBMI-LABEL: in8_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andb $85, %dil
+; CHECK-NOBMI-NEXT:    xorb %dil, %sil
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in8_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andb $85, %dil
+; CHECK-BMI-NEXT:    xorb %dil, %sil
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, 85
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16_constmask(i16 %x, i16 %y) {
+; CHECK-NOBMI-LABEL: in16_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $21845, %edi # imm = 0x5555
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in16_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $21845, %edi # imm = 0x5555
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, 21845
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32_constmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in32_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in32_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64_constmask(i64 %x, i64 %y) {
+; CHECK-NOBMI-LABEL: in64_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorq %rsi, %rdi
+; CHECK-NOBMI-NEXT:    movabsq $6148914691236517205, %rax # imm = 0x5555555555555555
+; CHECK-NOBMI-NEXT:    andq %rdi, %rax
+; CHECK-NOBMI-NEXT:    xorq %rsi, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in64_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorq %rsi, %rdi
+; CHECK-BMI-NEXT:    movabsq $6148914691236517205, %rax # imm = 0x5555555555555555
+; CHECK-BMI-NEXT:    andq %rdi, %rax
+; CHECK-BMI-NEXT:    xorq %rsi, %rax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, 6148914691236517205
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+
+; ============================================================================ ;
+; Constant Commutativity tests.
+; ============================================================================ ;
+
+define i32 @in_constmask_commutativity_0_1(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_0_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_0_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_0(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_1_0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl $1431655765, %esi # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_1_0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl $1431655765, %esi # imm = 0x55555555
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_1(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_1_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl $1431655765, %esi # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_1_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl $1431655765, %esi # imm = 0x55555555
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+
+define i32 @in_complex_y0_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-NOBMI-LABEL: in_complex_y0_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y0_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_complex_y1_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-NOBMI-LABEL: in_complex_y1_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y1_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+
+; Multi-use tests.
+
+declare void @use32(i32) nounwind
+
+define i32 @in_multiuse_A_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_A_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %esi, %ebx
+; CHECK-NOBMI-NEXT:    movl %edi, %ebp
+; CHECK-NOBMI-NEXT:    xorl %esi, %ebp
+; CHECK-NOBMI-NEXT:    andl $1431655765, %ebp # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    movl %ebp, %edi
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_A_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %esi, %ebx
+; CHECK-BMI-NEXT:    movl %edi, %ebp
+; CHECK-BMI-NEXT:    xorl %esi, %ebp
+; CHECK-BMI-NEXT:    andl $1431655765, %ebp # imm = 0x55555555
+; CHECK-BMI-NEXT:    movl %ebp, %edi
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_multiuse_B_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_B_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %esi, %ebx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %ebp
+; CHECK-NOBMI-NEXT:    andl $1431655765, %ebp # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_B_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %esi, %ebx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %ebp
+; CHECK-BMI-NEXT:    andl $1431655765, %ebp # imm = 0x55555555
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+; Various bad variants
+
+define i32 @n0_badconstmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: n0_badconstmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    andl $-1431655765, %esi # imm = 0xAAAAAAAB
+; CHECK-NOBMI-NEXT:    orl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n0_badconstmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-BMI-NEXT:    andl $-1431655765, %esi # imm = 0xAAAAAAAB
+; CHECK-BMI-NEXT:    orl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, 1431655765
+  %my = and i32 %y, -1431655765 ; instead of -1431655766
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i32 @n1_thirdvar_constmask(i32 %x, i32 %y, i32 %z) {
+; CHECK-NOBMI-LABEL: n1_thirdvar_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-NOBMI-NEXT:    xorl %edx, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n1_thirdvar_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $1431655765, %edi # imm = 0x55555555
+; CHECK-BMI-NEXT:    xorl %edx, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 1431655765
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}

llvm/trunk/test/CodeGen/X86/unfold-masked-merge-scalar-constmask-interleavedbytehalves.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=-bmi < %s | FileCheck %s --check-prefix=CHECK-NOBMI
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi < %s | FileCheck %s --check-prefix=CHECK-BMI
+
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+; X:           [bit 3210]
+; Y: [bit 7654]
+
+define i8 @out8_constmask(i8 %x, i8 %y) {
+; CHECK-NOBMI-LABEL: out8_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andb $15, %dil
+; CHECK-NOBMI-NEXT:    andb $-16, %sil
+; CHECK-NOBMI-NEXT:    orb %dil, %sil
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out8_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andb $15, %dil
+; CHECK-BMI-NEXT:    andb $-16, %sil
+; CHECK-BMI-NEXT:    orb %dil, %sil
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i8 %x, 15
+  %my = and i8 %y, -16
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16_constmask(i16 %x, i16 %y) {
+; CHECK-NOBMI-LABEL: out16_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-NOBMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-NOBMI-NEXT:    andl $3855, %edi # imm = 0xF0F
+; CHECK-NOBMI-NEXT:    andl $-3856, %esi # imm = 0xF0F0
+; CHECK-NOBMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-NOBMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out16_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-BMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-BMI-NEXT:    andl $3855, %edi # imm = 0xF0F
+; CHECK-BMI-NEXT:    andl $-3856, %esi # imm = 0xF0F0
+; CHECK-BMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-BMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i16 %x, 3855
+  %my = and i16 %y, -3856
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32_constmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: out32_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-NOBMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-NOBMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    andl $-252645136, %esi # imm = 0xF0F0F0F0
+; CHECK-NOBMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out32_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    # kill: def $esi killed $esi def $rsi
+; CHECK-BMI-NEXT:    # kill: def $edi killed $edi def $rdi
+; CHECK-BMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    andl $-252645136, %esi # imm = 0xF0F0F0F0
+; CHECK-BMI-NEXT:    leal (%rsi,%rdi), %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, 252645135
+  %my = and i32 %y, -252645136
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64_constmask(i64 %x, i64 %y) {
+; CHECK-NOBMI-LABEL: out64_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    movabsq $1085102592571150095, %rcx # imm = 0xF0F0F0F0F0F0F0F
+; CHECK-NOBMI-NEXT:    andq %rdi, %rcx
+; CHECK-NOBMI-NEXT:    movabsq $-1085102592571150096, %rax # imm = 0xF0F0F0F0F0F0F0F0
+; CHECK-NOBMI-NEXT:    andq %rsi, %rax
+; CHECK-NOBMI-NEXT:    orq %rcx, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out64_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    movabsq $1085102592571150095, %rcx # imm = 0xF0F0F0F0F0F0F0F
+; CHECK-BMI-NEXT:    andq %rdi, %rcx
+; CHECK-BMI-NEXT:    movabsq $-1085102592571150096, %rax # imm = 0xF0F0F0F0F0F0F0F0
+; CHECK-BMI-NEXT:    andq %rsi, %rax
+; CHECK-BMI-NEXT:    orq %rcx, %rax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i64 %x, 1085102592571150095
+  %my = and i64 %y, -1085102592571150096
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8_constmask(i8 %x, i8 %y) {
+; CHECK-NOBMI-LABEL: in8_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andb $15, %dil
+; CHECK-NOBMI-NEXT:    xorb %dil, %sil
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in8_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andb $15, %dil
+; CHECK-BMI-NEXT:    xorb %dil, %sil
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, 15
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16_constmask(i16 %x, i16 %y) {
+; CHECK-NOBMI-LABEL: in16_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $3855, %edi # imm = 0xF0F
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in16_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $3855, %edi # imm = 0xF0F
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, 3855
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32_constmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in32_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in32_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64_constmask(i64 %x, i64 %y) {
+; CHECK-NOBMI-LABEL: in64_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorq %rsi, %rdi
+; CHECK-NOBMI-NEXT:    movabsq $1085102592571150095, %rax # imm = 0xF0F0F0F0F0F0F0F
+; CHECK-NOBMI-NEXT:    andq %rdi, %rax
+; CHECK-NOBMI-NEXT:    xorq %rsi, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in64_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorq %rsi, %rdi
+; CHECK-BMI-NEXT:    movabsq $1085102592571150095, %rax # imm = 0xF0F0F0F0F0F0F0F
+; CHECK-BMI-NEXT:    andq %rdi, %rax
+; CHECK-BMI-NEXT:    xorq %rsi, %rax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, 1085102592571150095
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+
+; ============================================================================ ;
+; Constant Commutativity tests.
+; ============================================================================ ;
+
+define i32 @in_constmask_commutativity_0_1(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_0_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_0_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_0(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_1_0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl $252645135, %esi # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_1_0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl $252645135, %esi # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_1(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_1_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl $252645135, %esi # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_1_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl $252645135, %esi # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+
+define i32 @in_complex_y0_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-NOBMI-LABEL: in_complex_y0_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y0_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_complex_y1_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-NOBMI-LABEL: in_complex_y1_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y1_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+
+; Multi-use tests.
+
+declare void @use32(i32) nounwind
+
+define i32 @in_multiuse_A_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_A_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %esi, %ebx
+; CHECK-NOBMI-NEXT:    movl %edi, %ebp
+; CHECK-NOBMI-NEXT:    xorl %esi, %ebp
+; CHECK-NOBMI-NEXT:    andl $252645135, %ebp # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    movl %ebp, %edi
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_A_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %esi, %ebx
+; CHECK-BMI-NEXT:    movl %edi, %ebp
+; CHECK-BMI-NEXT:    xorl %esi, %ebp
+; CHECK-BMI-NEXT:    andl $252645135, %ebp # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    movl %ebp, %edi
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_multiuse_B_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_B_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %esi, %ebx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %ebp
+; CHECK-NOBMI-NEXT:    andl $252645135, %ebp # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_B_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %esi, %ebx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %ebp
+; CHECK-BMI-NEXT:    andl $252645135, %ebp # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+; Various bad variants
+
+define i32 @n0_badconstmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: n0_badconstmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    andl $-252645135, %esi # imm = 0xF0F0F0F1
+; CHECK-NOBMI-NEXT:    orl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n0_badconstmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    andl $-252645135, %esi # imm = 0xF0F0F0F1
+; CHECK-BMI-NEXT:    orl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, 252645135
+  %my = and i32 %y, -252645135 ; instead of -252645136
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i32 @n1_thirdvar_constmask(i32 %x, i32 %y, i32 %z) {
+; CHECK-NOBMI-LABEL: n1_thirdvar_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-NOBMI-NEXT:    xorl %edx, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n1_thirdvar_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl $252645135, %edi # imm = 0xF0F0F0F
+; CHECK-BMI-NEXT:    xorl %edx, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 252645135
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}

llvm/trunk/test/CodeGen/X86/unfold-masked-merge-scalar-constmask-lowhigh.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=-bmi < %s | FileCheck %s --check-prefix=CHECK-NOBMI
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi < %s | FileCheck %s --check-prefix=CHECK-BMI
+
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+; X:               [byte1][byte0]
+; Y: [byte3][byte2]
+
+define i8 @out8_constmask(i8 %x, i8 %y) {
+; CHECK-NOBMI-LABEL: out8_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andb $15, %dil
+; CHECK-NOBMI-NEXT:    andb $-16, %sil
+; CHECK-NOBMI-NEXT:    orb %dil, %sil
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out8_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andb $15, %dil
+; CHECK-BMI-NEXT:    andb $-16, %sil
+; CHECK-BMI-NEXT:    orb %dil, %sil
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i8 %x, 15
+  %my = and i8 %y, -16
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16_constmask(i16 %x, i16 %y) {
+; CHECK-NOBMI-LABEL: out16_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    movzbl %dil, %eax
+; CHECK-NOBMI-NEXT:    andl $-256, %esi
+; CHECK-NOBMI-NEXT:    orl %esi, %eax
+; CHECK-NOBMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out16_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    movzbl %dil, %eax
+; CHECK-BMI-NEXT:    andl $-256, %esi
+; CHECK-BMI-NEXT:    orl %esi, %eax
+; CHECK-BMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i16 %x, 255
+  %my = and i16 %y, -256
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32_constmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: out32_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    movzwl %di, %eax
+; CHECK-NOBMI-NEXT:    andl $-65536, %esi # imm = 0xFFFF0000
+; CHECK-NOBMI-NEXT:    orl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out32_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    movzwl %di, %eax
+; CHECK-BMI-NEXT:    andl $-65536, %esi # imm = 0xFFFF0000
+; CHECK-BMI-NEXT:    orl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, 65535
+  %my = and i32 %y, -65536
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64_constmask(i64 %x, i64 %y) {
+; CHECK-NOBMI-LABEL: out64_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    movl %edi, %ecx
+; CHECK-NOBMI-NEXT:    movabsq $-4294967296, %rax # imm = 0xFFFFFFFF00000000
+; CHECK-NOBMI-NEXT:    andq %rsi, %rax
+; CHECK-NOBMI-NEXT:    orq %rcx, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out64_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    movl %edi, %ecx
+; CHECK-BMI-NEXT:    movabsq $-4294967296, %rax # imm = 0xFFFFFFFF00000000
+; CHECK-BMI-NEXT:    andq %rsi, %rax
+; CHECK-BMI-NEXT:    orq %rcx, %rax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i64 %x, 4294967295
+  %my = and i64 %y, -4294967296
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8_constmask(i8 %x, i8 %y) {
+; CHECK-NOBMI-LABEL: in8_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andb $15, %dil
+; CHECK-NOBMI-NEXT:    xorb %dil, %sil
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in8_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andb $15, %dil
+; CHECK-BMI-NEXT:    xorb %dil, %sil
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, 15
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16_constmask(i16 %x, i16 %y) {
+; CHECK-NOBMI-LABEL: in16_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movzbl %dil, %eax
+; CHECK-NOBMI-NEXT:    xorl %esi, %eax
+; CHECK-NOBMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in16_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movzbl %dil, %eax
+; CHECK-BMI-NEXT:    xorl %esi, %eax
+; CHECK-BMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, 255
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32_constmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in32_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movzwl %di, %eax
+; CHECK-NOBMI-NEXT:    xorl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in32_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movzwl %di, %eax
+; CHECK-BMI-NEXT:    xorl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64_constmask(i64 %x, i64 %y) {
+; CHECK-NOBMI-LABEL: in64_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    xorl %edi, %eax
+; CHECK-NOBMI-NEXT:    xorq %rsi, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in64_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    xorl %edi, %eax
+; CHECK-BMI-NEXT:    xorq %rsi, %rax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, 4294967295
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+
+; ============================================================================ ;
+; Constant Commutativity tests.
+; ============================================================================ ;
+
+define i32 @in_constmask_commutativity_0_1(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_0_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movzwl %di, %eax
+; CHECK-NOBMI-NEXT:    xorl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_0_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movzwl %di, %eax
+; CHECK-BMI-NEXT:    xorl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_0(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_1_0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movzwl %si, %eax
+; CHECK-NOBMI-NEXT:    xorl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_1_0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movzwl %si, %eax
+; CHECK-BMI-NEXT:    xorl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+
+define i32 @in_constmask_commutativity_1_1(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: in_constmask_commutativity_1_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movzwl %si, %eax
+; CHECK-NOBMI-NEXT:    xorl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_constmask_commutativity_1_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movzwl %si, %eax
+; CHECK-BMI-NEXT:    xorl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+
+define i32 @in_complex_y0_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-NOBMI-LABEL: in_complex_y0_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movzwl %di, %eax
+; CHECK-NOBMI-NEXT:    xorl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y0_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movzwl %di, %eax
+; CHECK-BMI-NEXT:    xorl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_complex_y1_constmask(i32 %x, i32 %y_hi, i32 %y_low) {
+; CHECK-NOBMI-LABEL: in_complex_y1_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movzwl %di, %eax
+; CHECK-NOBMI-NEXT:    xorl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y1_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movzwl %di, %eax
+; CHECK-BMI-NEXT:    xorl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+
+; Multi-use tests.
+
+declare void @use32(i32) nounwind
+
+define i32 @in_multiuse_A_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_A_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %esi, %ebx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movzwl %di, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %edi
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_A_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %esi, %ebx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movzwl %di, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %edi
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i32 @in_multiuse_B_constmask(i32 %x, i32 %y, i32 %z) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_B_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %esi, %ebx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movzwl %di, %ebp
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_B_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %esi, %ebx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movzwl %di, %ebp
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+; Various bad variants
+
+define i32 @n0_badconstmask(i32 %x, i32 %y) {
+; CHECK-NOBMI-LABEL: n0_badconstmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    movzwl %di, %eax
+; CHECK-NOBMI-NEXT:    andl $-65535, %esi # imm = 0xFFFF0001
+; CHECK-NOBMI-NEXT:    orl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n0_badconstmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    movzwl %di, %eax
+; CHECK-BMI-NEXT:    andl $-65535, %esi # imm = 0xFFFF0001
+; CHECK-BMI-NEXT:    orl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, 65535
+  %my = and i32 %y, -65535 ; instead of -65536
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i32 @n1_thirdvar_constmask(i32 %x, i32 %y, i32 %z) {
+; CHECK-NOBMI-LABEL: n1_thirdvar_constmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movzwl %di, %eax
+; CHECK-NOBMI-NEXT:    xorl %edx, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n1_thirdvar_constmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movzwl %di, %eax
+; CHECK-BMI-NEXT:    xorl %edx, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, 65535
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}

llvm/trunk/test/CodeGen/X86/unfold-masked-merge-scalar-variablemask.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=-bmi < %s | FileCheck %s --check-prefix=CHECK-NOBMI
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi < %s | FileCheck %s --check-prefix=CHECK-BMI
+; https://bugs.llvm.org/show_bug.cgi?id=37104
+
+define i8 @out8(i8 %x, i8 %y, i8 %mask) {
+; CHECK-NOBMI-LABEL: out8:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    notb %dl
+; CHECK-NOBMI-NEXT:    andb %sil, %dl
+; CHECK-NOBMI-NEXT:    orb %dil, %dl
+; CHECK-NOBMI-NEXT:    movl %edx, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out8:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    notb %dl
+; CHECK-BMI-NEXT:    andb %sil, %dl
+; CHECK-BMI-NEXT:    orb %dil, %dl
+; CHECK-BMI-NEXT:    movl %edx, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i8 %x, %mask
+  %notmask = xor i8 %mask, -1
+  %my = and i8 %y, %notmask
+  %r = or i8 %mx, %my
+  ret i8 %r
+}
+
+define i16 @out16(i16 %x, i16 %y, i16 %mask) {
+; CHECK-NOBMI-LABEL: out16:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    notl %edx
+; CHECK-NOBMI-NEXT:    andl %esi, %edx
+; CHECK-NOBMI-NEXT:    orl %edi, %edx
+; CHECK-NOBMI-NEXT:    movl %edx, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out16:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    andnl %esi, %edx, %eax
+; CHECK-BMI-NEXT:    orl %edi, %eax
+; CHECK-BMI-NEXT:    # kill: def $ax killed $ax killed $eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i16 %x, %mask
+  %notmask = xor i16 %mask, -1
+  %my = and i16 %y, %notmask
+  %r = or i16 %mx, %my
+  ret i16 %r
+}
+
+define i32 @out32(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: out32:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    notl %edx
+; CHECK-NOBMI-NEXT:    andl %esi, %edx
+; CHECK-NOBMI-NEXT:    orl %edi, %edx
+; CHECK-NOBMI-NEXT:    movl %edx, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out32:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    andnl %esi, %edx, %eax
+; CHECK-BMI-NEXT:    orl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, %mask
+  %notmask = xor i32 %mask, -1
+  %my = and i32 %y, %notmask
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+
+define i64 @out64(i64 %x, i64 %y, i64 %mask) {
+; CHECK-NOBMI-LABEL: out64:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andq %rdx, %rdi
+; CHECK-NOBMI-NEXT:    notq %rdx
+; CHECK-NOBMI-NEXT:    andq %rsi, %rdx
+; CHECK-NOBMI-NEXT:    orq %rdi, %rdx
+; CHECK-NOBMI-NEXT:    movq %rdx, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: out64:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andq %rdx, %rdi
+; CHECK-BMI-NEXT:    andnq %rsi, %rdx, %rax
+; CHECK-BMI-NEXT:    orq %rdi, %rax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i64 %x, %mask
+  %notmask = xor i64 %mask, -1
+  %my = and i64 %y, %notmask
+  %r = or i64 %mx, %my
+  ret i64 %r
+}
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Should be the same as the previous one.
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+define i8 @in8(i8 %x, i8 %y, i8 %mask) {
+; CHECK-NOBMI-LABEL: in8:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in8:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i8 %x, %y
+  %n1 = and i8 %n0, %mask
+  %r = xor i8 %n1, %y
+  ret i8 %r
+}
+
+define i16 @in16(i16 %x, i16 %y, i16 %mask) {
+; CHECK-NOBMI-LABEL: in16:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in16:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i16 %x, %y
+  %n1 = and i16 %n0, %mask
+  %r = xor i16 %n1, %y
+  ret i16 %r
+}
+
+define i32 @in32(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: in32:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in32:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+
+define i64 @in64(i64 %x, i64 %y, i64 %mask) {
+; CHECK-NOBMI-LABEL: in64:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorq %rsi, %rdi
+; CHECK-NOBMI-NEXT:    andq %rdx, %rdi
+; CHECK-NOBMI-NEXT:    xorq %rsi, %rdi
+; CHECK-NOBMI-NEXT:    movq %rdi, %rax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in64:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorq %rsi, %rdi
+; CHECK-BMI-NEXT:    andq %rdx, %rdi
+; CHECK-BMI-NEXT:    xorq %rsi, %rdi
+; CHECK-BMI-NEXT:    movq %rdi, %rax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i64 %x, %y
+  %n1 = and i64 %n0, %mask
+  %r = xor i64 %n1, %y
+  ret i64 %r
+}
+; ============================================================================ ;
+; Commutativity tests.
+; ============================================================================ ;
+define i32 @in_commutativity_0_0_1(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: in_commutativity_0_0_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_commutativity_0_0_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0 ; swapped
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_commutativity_0_1_0(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: in_commutativity_0_1_0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_commutativity_0_1_0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+define i32 @in_commutativity_0_1_1(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: in_commutativity_0_1_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_commutativity_0_1_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0 ; swapped
+  %r = xor i32 %y, %n1 ; swapped
+  ret i32 %r
+}
+define i32 @in_commutativity_1_0_0(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: in_commutativity_1_0_0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_commutativity_1_0_0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+define i32 @in_commutativity_1_0_1(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: in_commutativity_1_0_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_commutativity_1_0_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0 ; swapped
+  %r = xor i32 %n1, %x ; %x instead of %y
+  ret i32 %r
+}
+define i32 @in_commutativity_1_1_0(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: in_commutativity_1_1_0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_commutativity_1_1_0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+define i32 @in_commutativity_1_1_1(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: in_commutativity_1_1_1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %edi, %esi
+; CHECK-NOBMI-NEXT:    movl %esi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_commutativity_1_1_1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %edi, %esi
+; CHECK-BMI-NEXT:    movl %esi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0 ; swapped
+  %r = xor i32 %x, %n1 ; swapped, %x instead of %y
+  ret i32 %r
+}
+; ============================================================================ ;
+; Y is an 'and' too.
+; ============================================================================ ;
+define i32 @in_complex_y0(i32 %x, i32 %y_hi, i32 %y_low, i32 %mask) {
+; CHECK-NOBMI-LABEL: in_complex_y0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %ecx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %ecx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_complex_y1(i32 %x, i32 %y_hi, i32 %y_low, i32 %mask) {
+; CHECK-NOBMI-LABEL: in_complex_y1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %ecx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %ecx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+; ============================================================================ ;
+; M is an 'xor' too.
+; ============================================================================ ;
+define i32 @in_complex_m0(i32 %x, i32 %y, i32 %m_a, i32 %m_b) {
+; CHECK-NOBMI-LABEL: in_complex_m0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %ecx, %edx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_m0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %ecx, %edx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_complex_m1(i32 %x, i32 %y, i32 %m_a, i32 %m_b) {
+; CHECK-NOBMI-LABEL: in_complex_m1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %ecx, %edx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_m1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %ecx, %edx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+; ============================================================================ ;
+; Both Y and M are complex.
+; ============================================================================ ;
+define i32 @in_complex_y0_m0(i32 %x, i32 %y_hi, i32 %y_low, i32 %m_a, i32 %m_b) {
+; CHECK-NOBMI-LABEL: in_complex_y0_m0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %r8d, %ecx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %ecx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y0_m0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %r8d, %ecx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %ecx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_complex_y1_m0(i32 %x, i32 %y_hi, i32 %y_low, i32 %m_a, i32 %m_b) {
+; CHECK-NOBMI-LABEL: in_complex_y1_m0:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %r8d, %ecx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %ecx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y1_m0:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %r8d, %ecx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %ecx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+define i32 @in_complex_y0_m1(i32 %x, i32 %y_hi, i32 %y_low, i32 %m_a, i32 %m_b) {
+; CHECK-NOBMI-LABEL: in_complex_y0_m1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %r8d, %ecx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %ecx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y0_m1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %r8d, %ecx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %ecx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_complex_y1_m1(i32 %x, i32 %y_hi, i32 %y_low, i32 %m_a, i32 %m_b) {
+; CHECK-NOBMI-LABEL: in_complex_y1_m1:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %esi
+; CHECK-NOBMI-NEXT:    xorl %r8d, %ecx
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %ecx, %edi
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_complex_y1_m1:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %esi
+; CHECK-BMI-NEXT:    xorl %r8d, %ecx
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %ecx, %edi
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %y = and i32 %y_hi, %y_low
+  %mask = xor i32 %m_a, %m_b
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %mask, %n0
+  %r = xor i32 %y, %n1
+  ret i32 %r
+}
+; ============================================================================ ;
+; Negative tests. Should not be folded.
+; ============================================================================ ;
+; Multi-use tests.
+declare void @use32(i32) nounwind
+define i32 @in_multiuse_A(i32 %x, i32 %y, i32 %z, i32 %mask) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_A:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %esi, %ebx
+; CHECK-NOBMI-NEXT:    movl %edi, %ebp
+; CHECK-NOBMI-NEXT:    xorl %esi, %ebp
+; CHECK-NOBMI-NEXT:    andl %ecx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %edi
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebx, %ebp
+; CHECK-NOBMI-NEXT:    movl %ebp, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_A:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %esi, %ebx
+; CHECK-BMI-NEXT:    movl %edi, %ebp
+; CHECK-BMI-NEXT:    xorl %esi, %ebp
+; CHECK-BMI-NEXT:    andl %ecx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %edi
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebx, %ebp
+; CHECK-BMI-NEXT:    movl %ebp, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  call void @use32(i32 %n1)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+define i32 @in_multiuse_B(i32 %x, i32 %y, i32 %z, i32 %mask) nounwind {
+; CHECK-NOBMI-LABEL: in_multiuse_B:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    pushq %rbp
+; CHECK-NOBMI-NEXT:    pushq %rbx
+; CHECK-NOBMI-NEXT:    pushq %rax
+; CHECK-NOBMI-NEXT:    movl %ecx, %ebx
+; CHECK-NOBMI-NEXT:    movl %esi, %ebp
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %edi, %ebx
+; CHECK-NOBMI-NEXT:    callq use32
+; CHECK-NOBMI-NEXT:    xorl %ebp, %ebx
+; CHECK-NOBMI-NEXT:    movl %ebx, %eax
+; CHECK-NOBMI-NEXT:    addq $8, %rsp
+; CHECK-NOBMI-NEXT:    popq %rbx
+; CHECK-NOBMI-NEXT:    popq %rbp
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: in_multiuse_B:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    pushq %rbp
+; CHECK-BMI-NEXT:    pushq %rbx
+; CHECK-BMI-NEXT:    pushq %rax
+; CHECK-BMI-NEXT:    movl %ecx, %ebx
+; CHECK-BMI-NEXT:    movl %esi, %ebp
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %edi, %ebx
+; CHECK-BMI-NEXT:    callq use32
+; CHECK-BMI-NEXT:    xorl %ebp, %ebx
+; CHECK-BMI-NEXT:    movl %ebx, %eax
+; CHECK-BMI-NEXT:    addq $8, %rsp
+; CHECK-BMI-NEXT:    popq %rbx
+; CHECK-BMI-NEXT:    popq %rbp
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  call void @use32(i32 %n0)
+  %r = xor i32 %n1, %y
+  ret i32 %r
+}
+; Various bad variants
+define i32 @n0_badmask(i32 %x, i32 %y, i32 %mask, i32 %mask2) {
+; CHECK-NOBMI-LABEL: n0_badmask:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    notl %ecx
+; CHECK-NOBMI-NEXT:    andl %esi, %ecx
+; CHECK-NOBMI-NEXT:    orl %edi, %ecx
+; CHECK-NOBMI-NEXT:    movl %ecx, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n0_badmask:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    andnl %esi, %ecx, %eax
+; CHECK-BMI-NEXT:    orl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, %mask
+  %notmask = xor i32 %mask2, -1 ; %mask2 instead of %mask
+  %my = and i32 %y, %notmask
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+define i32 @n0_badxor(i32 %x, i32 %y, i32 %mask) {
+; CHECK-NOBMI-LABEL: n0_badxor:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    andl %edx, %edi
+; CHECK-NOBMI-NEXT:    xorl $1, %edx
+; CHECK-NOBMI-NEXT:    andl %esi, %edx
+; CHECK-NOBMI-NEXT:    orl %edi, %edx
+; CHECK-NOBMI-NEXT:    movl %edx, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n0_badxor:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    andl %edx, %edi
+; CHECK-BMI-NEXT:    xorl $1, %edx
+; CHECK-BMI-NEXT:    andl %esi, %edx
+; CHECK-BMI-NEXT:    orl %edi, %edx
+; CHECK-BMI-NEXT:    movl %edx, %eax
+; CHECK-BMI-NEXT:    retq
+  %mx = and i32 %x, %mask
+  %notmask = xor i32 %mask, 1 ; instead of -1
+  %my = and i32 %y, %notmask
+  %r = or i32 %mx, %my
+  ret i32 %r
+}
+define i32 @n1_thirdvar(i32 %x, i32 %y, i32 %z, i32 %mask) {
+; CHECK-NOBMI-LABEL: n1_thirdvar:
+; CHECK-NOBMI:       # %bb.0:
+; CHECK-NOBMI-NEXT:    xorl %esi, %edi
+; CHECK-NOBMI-NEXT:    andl %ecx, %edi
+; CHECK-NOBMI-NEXT:    xorl %edx, %edi
+; CHECK-NOBMI-NEXT:    movl %edi, %eax
+; CHECK-NOBMI-NEXT:    retq
+;
+; CHECK-BMI-LABEL: n1_thirdvar:
+; CHECK-BMI:       # %bb.0:
+; CHECK-BMI-NEXT:    xorl %esi, %edi
+; CHECK-BMI-NEXT:    andl %ecx, %edi
+; CHECK-BMI-NEXT:    xorl %edx, %edi
+; CHECK-BMI-NEXT:    movl %edi, %eax
+; CHECK-BMI-NEXT:    retq
+  %n0 = xor i32 %x, %y
+  %n1 = and i32 %n0, %mask
+  %r = xor i32 %n1, %z ; instead of %y
+  ret i32 %r
+}