[Codegen] Merge tail blocks with no successors after block placement

[xbolva00]

Summary

I found the following case having tail blocks with no successors merging opportunities after block placement.

Before block placement:

bb0:

...
bne a0, 0, bb2:

bb1:

mv a0, 1
ret

bb2:

...

bb3:

mv a0, 1
ret

bb4:

mv a0, -1
ret

The conditional branch bne in bb0 is opposite to beq.

After block placement:

bb0:

...
beq a0, 0, bb1

bb2:

...

bb4:

mv a0, -1
ret

bb1:

mv a0, 1
ret

bb3:

mv a0, 1
ret

After block placement, that appears new tail merging opportunity, bb1 and bb3 can be merged as one block. So the conditional constraint for merging tail blocks with no successors should be removed. In my experiment for RISC-V, it decreases code size.

Author of original patch: Jim Lin

[dmgreen]

Hello. I agree that this looks like an improvement. Can you add a testcase?

[Jim]

Update test cases.

Tail blocks with no successors can be merged after block placement in test cases.

[aheejin]

test/CodeGen/WebAssembly/cfg-stackify.ll

544 ↗

(On Diff #175614)

You can probably drop this line, because this test is only checking control flow instructions.

[Jim]

Remove unnecessary checking in test/CodeGen/WebAssembly/cfg-stackify.ll.

[dmgreen]

I ran a few bootstraps to check compile time (on AArch64). It didn't seem to make any noticable difference there, and this certainly looks like its good for codesize.

Adding some people who may know about x86 tests (which look fine to me, but I'm no expert)

test/CodeGen/X86/loop-search.ll

23–24

Looks like this comment can be removed now

test/CodeGen/X86/tail-opts.ll

611

Can you explain this change? The comment makes it look like it should be the same test as above.

But it somehow has different fall-through branches with the switches?

[Jim]

Remove unused fixme comment in test/CodeGen/X86/loop-search.ll.

[aheejin]

test/CodeGen/WebAssembly/cfg-stackify.ll

544 ↗

(On Diff #175614)

I'm not sure if you are still planning to land this, but we deleted all OPT check lines in this file in D58953, so I think you should drop all changes to this file.

[xbolva00]

Please rebase/update

[craig.topper]

The X86 changes look ok to me except the open question on tail-opts.ll

[RKSimon]

test/CodeGen/X86/tail-opts.ll

611

icmp with undef will now constant fold in SelectionDAG - you're probably being affected by that

[xbolva00]

@Jim are you going to update this patch?

[xbolva00]

Rebased to master.

Please check it again.

[xbolva00]

Updated

[xbolva00]

@craig.topper , @dmgreen if patch is ok now, please approve it formally. Thanks.

[rnk]

lib/CodeGen/BranchFolding.cpp

1076–1077

The fact that you have to update so many tests shows that this comment is incorrect, at the very least.

test/CodeGen/X86/tail-opts.ll

594

I think we have to fix this test by replacing uses of undef with some new i32 parameter, then it will test the relevant code again.

[xbolva00]

FIxed review notes by @rnk. Thanks.

[xbolva00]

Fixed all undefs.

[xbolva00]

Preserve test logic in tail opts.

[Jim]

lib/CodeGen/BranchFolding.cpp

1074

This change is it neccessary?

test/CodeGen/X86/tail-opts.ll

611

This testcase tests that two tail_call_me can't be merged into one for performance issue.
But bby and bbx are likely the same. This patch makes bby and bbx merge into one.
And make tail_call_me only need one.
So the two comparison of switch in bby and bbx should be changed difference.

This is my testcase to keep tail_call_me tail-duplicated.

define void @two_nosize(i32 %x, i32 %y, i32 %z) nounwind {
entry:
  %0 = icmp eq i32 %x, 0
  br i1 %0, label %bbx, label %bby

bby:
  switch i32 %y, label %bb7 [
    i32 0, label %return
  ]

bb7:
  store volatile i32 0, i32* @XYZ
  tail call void @tail_call_me()
  ret void

bbx:
  switch i32 %z, label %bb12 [
    i32 -1, label %return
  ]

bb12:
  store volatile i32 0, i32* @XYZ
  tail call void @tail_call_me()
  ret void

return:
  ret void
}

Let two comparison compare with 0 or -1. So that tail call tail_call_me can be put on the fall through edge.

[xbolva00]

lib/CodeGen/BranchFolding.cpp

1074

I think it is fine since we touch this code/function, we should clang-format it too..

test/CodeGen/X86/tail-opts.ll

611

Thanks for testcase, I will update it.

[xbolva00]

Updated tail opts with testcase from @Jim. Thanks.

[Jim]

test/CodeGen/X86/tail-opts.ll

611

Thanks.

[dmgreen]

LGTM, if everyone are happy with tests.

Thanks @xbolva00 for pushing this forward, and thanks @Jim for the idea and getting things started!

[xbolva00]

Thanks!

@rnk, @RKSimon fine for you too?

[Jim]

LGTM.

lib/CodeGen/BranchFolding.cpp

while (MergePotentials.size() > 1) {
     // that match it with a smaller number of instructions.
     MadeChange = true;
   }
   return MadeChange;
 }
 
 bool BranchFolder::TailMergeBlocks(MachineFunction &MF) {
   bool MadeChange = false;
-  if (!EnableTailMerge) return MadeChange;
+  if (!EnableTailMerge)
+    return MadeChange;
 
   // First find blocks with no successors.
-  // Block placement does not create new tail merging opportunities for these
-  // blocks.
-  if (!AfterBlockPlacement) {
-    MergePotentials.clear();
-    for (MachineBasicBlock &MBB : MF) {
-      if (MergePotentials.size() == TailMergeThreshold)
-        break;
-      if (!TriedMerging.count(&MBB) && MBB.succ_empty())
-        MergePotentials.push_back(MergePotentialsElt(HashEndOfMBB(MBB), &MBB));
-    }
+  // Block placement may create new tail merging opportunities for these blocks.
 
-    // If this is a large problem, avoid visiting the same basic blocks
-    // multiple times.
-    if (MergePotentials.size() == TailMergeThreshold)
-      for (unsigned i = 0, e = MergePotentials.size(); i != e; ++i)
-        TriedMerging.insert(MergePotentials[i].getBlock());
 
-    // See if we can do any tail merging on those.
-    if (MergePotentials.size() >= 2)
-      MadeChange |= TryTailMergeBlocks(nullptr, nullptr, MinCommonTailLength);
-  }
 
   // Look at blocks (IBB) with multiple predecessors (PBB).
   // We change each predecessor to a canonical form, by
   // (1) temporarily removing any unconditional branch from the predecessor
   // to IBB, and
   // (2) alter conditional branches so they branch to the other block
   // not IBB; this may require adding back an unconditional branch to IBB
   // later, where there wasn't one coming in.  E.g.

test/CodeGen/Thumb2/v8_IT_3.ll

 ; CHECK-PIC: cmp
 ; CHECK-PIC: cmp
 ; CHECK-PIC: it eq
 ; CHECK-PIC-NEXT: ldreq
 ; CHECK-PIC-NEXT: it eq
 ; CHECK-PIC-NEXT: cmpeq
 ; CHECK-PIC-NEXT: beq
 ; CHECK-PIC: %bb6
-; CHECK-PIC-NEXT: movs
-; CHECK-PIC-NEXT: add
-; CHECK-PIC-NEXT: pop
+; CHECK-PIC: mov
   ret i32 0
 
 bb6:
   ret i32 1
 
 bb8:
   ret i32 -1
 }
 
 declare i32 @printf(i8*, ...)
 
 declare %struct.FF* @Get()
 
 declare i32 @foo(i8*, i64, i32)
 
 declare i32 @bar(i32, i32, i32)

test/CodeGen/WinEH/wineh-noret-cleanup.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: sed -e s/.Cxx:// %s | llc -mtriple=x86_64-pc-windows-msvc | FileCheck %s --check-prefix=CXX
 ; RUN: sed -e s/.Seh:// %s | llc -mtriple=x86_64-pc-windows-msvc | FileCheck %s --check-prefix=SEH
 
 declare i32 @__CxxFrameHandler3(...)
 declare i32 @__C_specific_handler(...)
 declare void @dummy_filter()
 
 declare void @f(i32)

 ; SEH-LABEL: .Llsda_begin0:
 ; SEH-NEXT:    .long   .Ltmp0@IMGREL+1
 ; SEH-NEXT:    .long   .Ltmp1@IMGREL+1
 ; SEH-NEXT:    .long   dummy_filter@IMGREL
 ; SEH-NEXT:    .long   .LBB0_3@IMGREL
 ; SEH-NEXT:    .long   .Ltmp0@IMGREL+1
 ; SEH-NEXT:    .long   .Ltmp1@IMGREL+1
 ; SEH-NEXT:    .long   dummy_filter@IMGREL
-; SEH-NEXT:    .long   .LBB0_5@IMGREL
+; SEH-NEXT:    .long   .LBB0_2@IMGREL
 ; SEH-NEXT:    .long   .Ltmp2@IMGREL+1
 ; SEH-NEXT:    .long   .Ltmp3@IMGREL+1
-; SEH-NEXT:    .long   "?dtor$2@?0?test@4HA"@IMGREL
+; SEH-NEXT:    .long   "?dtor$5@?0?test@4HA"@IMGREL 
 ; SEH-NEXT:    .long   0
 ; SEH-NEXT:    .long   .Ltmp2@IMGREL+1
 ; SEH-NEXT:    .long   .Ltmp3@IMGREL+1
 ; SEH-NEXT:    .long   dummy_filter@IMGREL
-; SEH-NEXT:    .long   .LBB0_5@IMGREL
+; SEH-NEXT:    .long   .LBB0_2@IMGREL
 ; SEH-NEXT:  .Llsda_end0:

test/CodeGen/X86/conditional-tailcall.ll

 }
 
 declare x86_thiscallcc zeroext i1 @baz(i8*, i32)
 define x86_thiscallcc zeroext i1 @BlockPlacementTest(i8* %this, i32 %x) optsize {
 ; CHECK32-LABEL: BlockPlacementTest:
 ; CHECK32:       # %bb.0: # %entry
 ; CHECK32-NEXT:    movl {{[0-9]+}}(%esp), %edx # encoding: [0x8b,0x54,0x24,0x04]
 ; CHECK32-NEXT:    testb $42, %dl # encoding: [0xf6,0xc2,0x2a]
-; CHECK32-NEXT:    je .LBB2_1 # encoding: [0x74,A]
-; CHECK32-NEXT:    # fixup A - offset: 1, value: .LBB2_1-1, kind: FK_PCRel_1
-; CHECK32-NEXT:  # %bb.2: # %land.rhs
+; CHECK32-NEXT:    je .LBB2_3 # encoding: [0x74,A]
+; CHECK32-NEXT:    # fixup A - offset: 1, value: .LBB2_3-1, kind: FK_PCRel_1
+; CHECK32-NEXT:  # %bb.1: # %land.rhs
 ; CHECK32-NEXT:    movb $1, %al # encoding: [0xb0,0x01]
 ; CHECK32-NEXT:    testb $44, %dl # encoding: [0xf6,0xc2,0x2c]
 ; CHECK32-NEXT:    je baz # TAILCALL
 ; CHECK32-NEXT:    # encoding: [0x74,A]
 ; CHECK32-NEXT:    # fixup A - offset: 1, value: baz-1, kind: FK_PCRel_1
-; CHECK32-NEXT:  # %bb.3: # %land.end
+; CHECK32-NEXT:  .LBB2_2: # %land.end
 ; CHECK32-NEXT:    # kill: def $al killed $al killed $eax
 ; CHECK32-NEXT:    retl $4 # encoding: [0xc2,0x04,0x00]
-; CHECK32-NEXT:  .LBB2_1:
+; CHECK32-NEXT:  .LBB2_3:
 ; CHECK32-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
-; CHECK32-NEXT:    # kill: def $al killed $al killed $eax
-; CHECK32-NEXT:    retl $4 # encoding: [0xc2,0x04,0x00]
+; CHECK32-NEXT:    jmp .LBB2_2 # encoding: [0xeb,A]
+; CHECK32-NEXT:    # fixup A - offset: 1, value: .LBB2_2-1, kind: FK_PCRel_1
 ;
 ; CHECK64-LABEL: BlockPlacementTest:
 ; CHECK64:       # %bb.0: # %entry
 ; CHECK64-NEXT:    testb $42, %sil # encoding: [0x40,0xf6,0xc6,0x2a]
-; CHECK64-NEXT:    je .LBB2_1 # encoding: [0x74,A]
-; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB2_1-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  # %bb.2: # %land.rhs
+; CHECK64-NEXT:    je .LBB2_3 # encoding: [0x74,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB2_3-1, kind: FK_PCRel_1
+; CHECK64-NEXT:  # %bb.1: # %land.rhs
 ; CHECK64-NEXT:    movb $1, %al # encoding: [0xb0,0x01]
 ; CHECK64-NEXT:    testb $44, %sil # encoding: [0x40,0xf6,0xc6,0x2c]
 ; CHECK64-NEXT:    je baz # TAILCALL
 ; CHECK64-NEXT:    # encoding: [0x74,A]
 ; CHECK64-NEXT:    # fixup A - offset: 1, value: baz-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  # %bb.3: # %land.end
+; CHECK64-NEXT:  .LBB2_2: # %land.end
 ; CHECK64-NEXT:    # kill: def $al killed $al killed $eax
 ; CHECK64-NEXT:    retq # encoding: [0xc3]
-; CHECK64-NEXT:  .LBB2_1:
+; CHECK64-NEXT:  .LBB2_3:
 ; CHECK64-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
-; CHECK64-NEXT:    # kill: def $al killed $al killed $eax
-; CHECK64-NEXT:    retq # encoding: [0xc3]
+; CHECK64-NEXT:    jmp .LBB2_2 # encoding: [0xeb,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB2_2-1, kind: FK_PCRel_1
 ;
 ; WIN64-LABEL: BlockPlacementTest:
 ; WIN64:       # %bb.0: # %entry
 ; WIN64-NEXT:    testb $42, %dl # encoding: [0xf6,0xc2,0x2a]
-; WIN64-NEXT:    je .LBB2_1 # encoding: [0x74,A]
-; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB2_1-1, kind: FK_PCRel_1
-; WIN64-NEXT:  # %bb.2: # %land.rhs
+; WIN64-NEXT:    je .LBB2_3 # encoding: [0x74,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB2_3-1, kind: FK_PCRel_1
+; WIN64-NEXT:  # %bb.1: # %land.rhs
 ; WIN64-NEXT:    movb $1, %al # encoding: [0xb0,0x01]
 ; WIN64-NEXT:    testb $44, %dl # encoding: [0xf6,0xc2,0x2c]
 ; WIN64-NEXT:    je baz # TAILCALL
 ; WIN64-NEXT:    # encoding: [0x74,A]
 ; WIN64-NEXT:    # fixup A - offset: 1, value: baz-1, kind: FK_PCRel_1
-; WIN64-NEXT:  # %bb.3: # %land.end
+; WIN64-NEXT:  .LBB2_2: # %land.end
 ; WIN64-NEXT:    # kill: def $al killed $al killed $eax
 ; WIN64-NEXT:    retq # encoding: [0xc3]
-; WIN64-NEXT:  .LBB2_1:
+; WIN64-NEXT:  .LBB2_3:
 ; WIN64-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
-; WIN64-NEXT:    # kill: def $al killed $al killed $eax
-; WIN64-NEXT:    retq # encoding: [0xc3]
+; WIN64-NEXT:    jmp .LBB2_2 # encoding: [0xeb,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB2_2-1, kind: FK_PCRel_1
 entry:
   %and = and i32 %x, 42
   %tobool = icmp eq i32 %and, 0
   br i1 %tobool, label %land.end, label %land.rhs
 
 land.rhs:
   %and6 = and i32 %x, 44
   %tobool7 = icmp eq i32 %and6, 0

 ; CHECK64-NEXT:    pushq $2 # encoding: [0x6a,0x02]
 ; CHECK64-NEXT:    .cfi_adjust_cfa_offset 8
 ; CHECK64-NEXT:    popq %r9 # encoding: [0x41,0x59]
 ; CHECK64-NEXT:    .cfi_adjust_cfa_offset -8
 ; CHECK64-NEXT:    pushq $1 # encoding: [0x6a,0x01]
 ; CHECK64-NEXT:    .cfi_adjust_cfa_offset 8
 ; CHECK64-NEXT:    popq %r8 # encoding: [0x41,0x58]
 ; CHECK64-NEXT:    .cfi_adjust_cfa_offset -8
-; CHECK64-NEXT:    jmp .LBB3_1 # encoding: [0xeb,A]
-; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_1-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  .LBB3_2: # %for.body
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
-; CHECK64-NEXT:    cmpl $2, %ecx # encoding: [0x83,0xf9,0x02]
-; CHECK64-NEXT:    je .LBB3_11 # encoding: [0x74,A]
+; CHECK64-NEXT:    jmp .LBB3_11 # encoding: [0xeb,A]
 ; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_11-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  # %bb.3: # %for.body
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; CHECK64-NEXT:  .LBB3_1: # %for.body
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
+; CHECK64-NEXT:    cmpl $2, %ecx # encoding: [0x83,0xf9,0x02]
+; CHECK64-NEXT:    je .LBB3_9 # encoding: [0x74,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_9-1, kind: FK_PCRel_1
+; CHECK64-NEXT:  # %bb.2: # %for.body
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
 ; CHECK64-NEXT:    cmpl $1, %ecx # encoding: [0x83,0xf9,0x01]
-; CHECK64-NEXT:    je .LBB3_10 # encoding: [0x74,A]
-; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_10-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  # %bb.4: # %for.body
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; CHECK64-NEXT:    je .LBB3_7 # encoding: [0x74,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_7-1, kind: FK_PCRel_1
+; CHECK64-NEXT:  # %bb.3: # %for.body
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
 ; CHECK64-NEXT:    testl %ecx, %ecx # encoding: [0x85,0xc9]
-; CHECK64-NEXT:    jne .LBB3_12 # encoding: [0x75,A]
-; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_12-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  # %bb.5: # %sw.bb
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; CHECK64-NEXT:    jne .LBB3_10 # encoding: [0x75,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_10-1, kind: FK_PCRel_1
+; CHECK64-NEXT:  # %bb.4: # %sw.bb
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
 ; CHECK64-NEXT:    movzbl (%rdi), %edx # encoding: [0x0f,0xb6,0x17]
 ; CHECK64-NEXT:    cmpl $43, %edx # encoding: [0x83,0xfa,0x2b]
 ; CHECK64-NEXT:    movl %r8d, %ecx # encoding: [0x44,0x89,0xc1]
-; CHECK64-NEXT:    je .LBB3_12 # encoding: [0x74,A]
-; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_12-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  # %bb.6: # %sw.bb
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; CHECK64-NEXT:    je .LBB3_10 # encoding: [0x74,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_10-1, kind: FK_PCRel_1
+; CHECK64-NEXT:  # %bb.5: # %sw.bb
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
 ; CHECK64-NEXT:    cmpb $45, %dl # encoding: [0x80,0xfa,0x2d]
 ; CHECK64-NEXT:    movl %r8d, %ecx # encoding: [0x44,0x89,0xc1]
-; CHECK64-NEXT:    je .LBB3_12 # encoding: [0x74,A]
-; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_12-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  # %bb.7: # %if.else
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; CHECK64-NEXT:    je .LBB3_10 # encoding: [0x74,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_10-1, kind: FK_PCRel_1
+; CHECK64-NEXT:  # %bb.6: # %if.else
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
 ; CHECK64-NEXT:    addl $-48, %edx # encoding: [0x83,0xc2,0xd0]
 ; CHECK64-NEXT:    cmpl $10, %edx # encoding: [0x83,0xfa,0x0a]
 ; CHECK64-NEXT:    jmp .LBB3_8 # encoding: [0xeb,A]
 ; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_8-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  .LBB3_10: # %sw.bb14
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; CHECK64-NEXT:  .LBB3_7: # %sw.bb14
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
 ; CHECK64-NEXT:    movzbl (%rdi), %ecx # encoding: [0x0f,0xb6,0x0f]
 ; CHECK64-NEXT:    addl $-48, %ecx # encoding: [0x83,0xc1,0xd0]
 ; CHECK64-NEXT:    cmpl $10, %ecx # encoding: [0x83,0xf9,0x0a]
 ; CHECK64-NEXT:  .LBB3_8: # %if.else
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
 ; CHECK64-NEXT:    movl %r9d, %ecx # encoding: [0x44,0x89,0xc9]
-; CHECK64-NEXT:    jb .LBB3_12 # encoding: [0x72,A]
-; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_12-1, kind: FK_PCRel_1
-; CHECK64-NEXT:    jmp .LBB3_9 # encoding: [0xeb,A]
-; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_9-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  .LBB3_11: # %sw.bb22
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; CHECK64-NEXT:    jb .LBB3_10 # encoding: [0x72,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_10-1, kind: FK_PCRel_1
+; CHECK64-NEXT:    jmp .LBB3_13 # encoding: [0xeb,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_13-1, kind: FK_PCRel_1
+; CHECK64-NEXT:  .LBB3_9: # %sw.bb22
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
 ; CHECK64-NEXT:    movzbl (%rdi), %ecx # encoding: [0x0f,0xb6,0x0f]
 ; CHECK64-NEXT:    addl $-48, %ecx # encoding: [0x83,0xc1,0xd0]
 ; CHECK64-NEXT:    cmpl $10, %ecx # encoding: [0x83,0xf9,0x0a]
 ; CHECK64-NEXT:    movl %r9d, %ecx # encoding: [0x44,0x89,0xc9]
 ; CHECK64-NEXT:    jae _Z20isValidIntegerSuffixN9__gnu_cxx17__normal_iteratorIPKcSsEES3_ # TAILCALL
 ; CHECK64-NEXT:    # encoding: [0x73,A]
 ; CHECK64-NEXT:    # fixup A - offset: 1, value: _Z20isValidIntegerSuffixN9__gnu_cxx17__normal_iteratorIPKcSsEES3_-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  .LBB3_12: # %for.inc
-; CHECK64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; CHECK64-NEXT:  .LBB3_10: # %for.inc
+; CHECK64-NEXT:    # in Loop: Header=BB3_11 Depth=1
 ; CHECK64-NEXT:    incq %rdi # encoding: [0x48,0xff,0xc7]
 ; CHECK64-NEXT:    decq %rax # encoding: [0x48,0xff,0xc8]
-; CHECK64-NEXT:  .LBB3_1: # %for.cond
+; CHECK64-NEXT:  .LBB3_11: # %for.cond
 ; CHECK64-NEXT:    # =>This Inner Loop Header: Depth=1
 ; CHECK64-NEXT:    testq %rax, %rax # encoding: [0x48,0x85,0xc0]
-; CHECK64-NEXT:    jne .LBB3_2 # encoding: [0x75,A]
-; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_2-1, kind: FK_PCRel_1
-; CHECK64-NEXT:  # %bb.13:
+; CHECK64-NEXT:    jne .LBB3_1 # encoding: [0x75,A]
+; CHECK64-NEXT:    # fixup A - offset: 1, value: .LBB3_1-1, kind: FK_PCRel_1
+; CHECK64-NEXT:  # %bb.12:
 ; CHECK64-NEXT:    cmpl $2, %ecx # encoding: [0x83,0xf9,0x02]
 ; CHECK64-NEXT:    sete %al # encoding: [0x0f,0x94,0xc0]
 ; CHECK64-NEXT:    # kill: def $al killed $al killed $eax
 ; CHECK64-NEXT:    retq # encoding: [0xc3]
-; CHECK64-NEXT:  .LBB3_9:
+; CHECK64-NEXT:  .LBB3_13:
 ; CHECK64-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
 ; CHECK64-NEXT:    # kill: def $al killed $al killed $eax
 ; CHECK64-NEXT:    retq # encoding: [0xc3]
 ;
 ; WIN64-LABEL: pr31257:
 ; WIN64:       # %bb.0: # %entry
 ; WIN64-NEXT:    movq (%rcx), %rcx # encoding: [0x48,0x8b,0x09]
 ; WIN64-NEXT:    movq -24(%rcx), %r8 # encoding: [0x4c,0x8b,0x41,0xe8]
 ; WIN64-NEXT:    leaq (%rcx,%r8), %rdx # encoding: [0x4a,0x8d,0x14,0x01]
 ; WIN64-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
-; WIN64-NEXT:    jmp .LBB3_1 # encoding: [0xeb,A]
-; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_1-1, kind: FK_PCRel_1
-; WIN64-NEXT:  .LBB3_2: # %for.body
-; WIN64-NEXT:    # in Loop: Header=BB3_1 Depth=1
-; WIN64-NEXT:    cmpl $2, %eax # encoding: [0x83,0xf8,0x02]
-; WIN64-NEXT:    je .LBB3_10 # encoding: [0x74,A]
+; WIN64-NEXT:    jmp .LBB3_10 # encoding: [0xeb,A]
 ; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_10-1, kind: FK_PCRel_1
-; WIN64-NEXT:  # %bb.3: # %for.body
-; WIN64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; WIN64-NEXT:  .LBB3_1: # %for.body
+; WIN64-NEXT:    # in Loop: Header=BB3_10 Depth=1
+; WIN64-NEXT:    cmpl $2, %eax # encoding: [0x83,0xf8,0x02]
+; WIN64-NEXT:    je .LBB3_8 # encoding: [0x74,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_8-1, kind: FK_PCRel_1
+; WIN64-NEXT:  # %bb.2: # %for.body
+; WIN64-NEXT:    # in Loop: Header=BB3_10 Depth=1
 ; WIN64-NEXT:    cmpl $1, %eax # encoding: [0x83,0xf8,0x01]
-; WIN64-NEXT:    je .LBB3_9 # encoding: [0x74,A]
-; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_9-1, kind: FK_PCRel_1
-; WIN64-NEXT:  # %bb.4: # %for.body
-; WIN64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; WIN64-NEXT:    je .LBB3_6 # encoding: [0x74,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_6-1, kind: FK_PCRel_1
+; WIN64-NEXT:  # %bb.3: # %for.body
+; WIN64-NEXT:    # in Loop: Header=BB3_10 Depth=1
 ; WIN64-NEXT:    testl %eax, %eax # encoding: [0x85,0xc0]
-; WIN64-NEXT:    jne .LBB3_11 # encoding: [0x75,A]
-; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_11-1, kind: FK_PCRel_1
-; WIN64-NEXT:  # %bb.5: # %sw.bb
-; WIN64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; WIN64-NEXT:    jne .LBB3_9 # encoding: [0x75,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_9-1, kind: FK_PCRel_1
+; WIN64-NEXT:  # %bb.4: # %sw.bb
+; WIN64-NEXT:    # in Loop: Header=BB3_10 Depth=1
 ; WIN64-NEXT:    movzbl (%rcx), %r9d # encoding: [0x44,0x0f,0xb6,0x09]
 ; WIN64-NEXT:    cmpl $43, %r9d # encoding: [0x41,0x83,0xf9,0x2b]
 ; WIN64-NEXT:    movl $1, %eax # encoding: [0xb8,0x01,0x00,0x00,0x00]
-; WIN64-NEXT:    je .LBB3_11 # encoding: [0x74,A]
-; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_11-1, kind: FK_PCRel_1
-; WIN64-NEXT:  # %bb.6: # %sw.bb
-; WIN64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; WIN64-NEXT:    je .LBB3_9 # encoding: [0x74,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_9-1, kind: FK_PCRel_1
+; WIN64-NEXT:  # %bb.5: # %sw.bb
+; WIN64-NEXT:    # in Loop: Header=BB3_10 Depth=1
 ; WIN64-NEXT:    cmpb $45, %r9b # encoding: [0x41,0x80,0xf9,0x2d]
-; WIN64-NEXT:    je .LBB3_11 # encoding: [0x74,A]
-; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_11-1, kind: FK_PCRel_1
+; WIN64-NEXT:    je .LBB3_9 # encoding: [0x74,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_9-1, kind: FK_PCRel_1
 ; WIN64-NEXT:    jmp .LBB3_7 # encoding: [0xeb,A]
 ; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_7-1, kind: FK_PCRel_1
-; WIN64-NEXT:  .LBB3_9: # %sw.bb14
-; WIN64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; WIN64-NEXT:  .LBB3_6: # %sw.bb14
+; WIN64-NEXT:    # in Loop: Header=BB3_10 Depth=1
 ; WIN64-NEXT:    movzbl (%rcx), %r9d # encoding: [0x44,0x0f,0xb6,0x09]
 ; WIN64-NEXT:  .LBB3_7: # %if.else
-; WIN64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; WIN64-NEXT:    # in Loop: Header=BB3_10 Depth=1
 ; WIN64-NEXT:    addl $-48, %r9d # encoding: [0x41,0x83,0xc1,0xd0]
 ; WIN64-NEXT:    movl $2, %eax # encoding: [0xb8,0x02,0x00,0x00,0x00]
 ; WIN64-NEXT:    cmpl $10, %r9d # encoding: [0x41,0x83,0xf9,0x0a]
-; WIN64-NEXT:    jb .LBB3_11 # encoding: [0x72,A]
-; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_11-1, kind: FK_PCRel_1
-; WIN64-NEXT:    jmp .LBB3_8 # encoding: [0xeb,A]
-; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_8-1, kind: FK_PCRel_1
-; WIN64-NEXT:  .LBB3_10: # %sw.bb22
-; WIN64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; WIN64-NEXT:    jb .LBB3_9 # encoding: [0x72,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_9-1, kind: FK_PCRel_1
+; WIN64-NEXT:    jmp .LBB3_12 # encoding: [0xeb,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_12-1, kind: FK_PCRel_1
+; WIN64-NEXT:  .LBB3_8: # %sw.bb22
+; WIN64-NEXT:    # in Loop: Header=BB3_10 Depth=1
 ; WIN64-NEXT:    movzbl (%rcx), %r9d # encoding: [0x44,0x0f,0xb6,0x09]
 ; WIN64-NEXT:    addl $-48, %r9d # encoding: [0x41,0x83,0xc1,0xd0]
 ; WIN64-NEXT:    movl $2, %eax # encoding: [0xb8,0x02,0x00,0x00,0x00]
 ; WIN64-NEXT:    cmpl $10, %r9d # encoding: [0x41,0x83,0xf9,0x0a]
 ; WIN64-NEXT:    jae _Z20isValidIntegerSuffixN9__gnu_cxx17__normal_iteratorIPKcSsEES3_ # TAILCALL
 ; WIN64-NEXT:    # encoding: [0x73,A]
 ; WIN64-NEXT:    # fixup A - offset: 1, value: _Z20isValidIntegerSuffixN9__gnu_cxx17__normal_iteratorIPKcSsEES3_-1, kind: FK_PCRel_1
-; WIN64-NEXT:  .LBB3_11: # %for.inc
-; WIN64-NEXT:    # in Loop: Header=BB3_1 Depth=1
+; WIN64-NEXT:  .LBB3_9: # %for.inc
+; WIN64-NEXT:    # in Loop: Header=BB3_10 Depth=1
 ; WIN64-NEXT:    incq %rcx # encoding: [0x48,0xff,0xc1]
 ; WIN64-NEXT:    decq %r8 # encoding: [0x49,0xff,0xc8]
-; WIN64-NEXT:  .LBB3_1: # %for.cond
+; WIN64-NEXT:  .LBB3_10: # %for.cond
 ; WIN64-NEXT:    # =>This Inner Loop Header: Depth=1
 ; WIN64-NEXT:    testq %r8, %r8 # encoding: [0x4d,0x85,0xc0]
-; WIN64-NEXT:    jne .LBB3_2 # encoding: [0x75,A]
-; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_2-1, kind: FK_PCRel_1
-; WIN64-NEXT:  # %bb.12:
+; WIN64-NEXT:    jne .LBB3_1 # encoding: [0x75,A]
+; WIN64-NEXT:    # fixup A - offset: 1, value: .LBB3_1-1, kind: FK_PCRel_1
+; WIN64-NEXT:  # %bb.11:
 ; WIN64-NEXT:    cmpl $2, %eax # encoding: [0x83,0xf8,0x02]
 ; WIN64-NEXT:    sete %al # encoding: [0x0f,0x94,0xc0]
 ; WIN64-NEXT:    # kill: def $al killed $al killed $eax
 ; WIN64-NEXT:    retq # encoding: [0xc3]
-; WIN64-NEXT:  .LBB3_8:
+; WIN64-NEXT:  .LBB3_12:
 ; WIN64-NEXT:    xorl %eax, %eax # encoding: [0x31,0xc0]
 ; WIN64-NEXT:    # kill: def $al killed $al killed $eax
 ; WIN64-NEXT:    retq # encoding: [0xc3]
 entry:
   %_M_p.i.i = getelementptr inbounds %"class.std::basic_string", %"class.std::basic_string"* %s, i64 0, i32 0, i32 0
   %0 = load i8*, i8** %_M_p.i.i, align 8
   %arrayidx.i.i.i54 = getelementptr inbounds i8, i8* %0, i64 -24
   %_M_length.i.i55 = bitcast i8* %arrayidx.i.i.i54 to i64*

test/CodeGen/X86/loop-search.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
 
 ; This test comes from PR27136
 ; We should hoist loop constant invariant
 
 define zeroext i1 @search(i32 %needle, i32* nocapture readonly %haystack, i32 %count) {
 ; CHECK-LABEL: search:
 ; CHECK:       ## %bb.0: ## %entry
 ; CHECK-NEXT:    testl %edx, %edx
-; CHECK-NEXT:    jle LBB0_1
-; CHECK-NEXT:  ## %bb.4: ## %for.body.preheader
+; CHECK-NEXT:    jle LBB0_5
+; CHECK-NEXT:  ## %bb.1: ## %for.body.preheader
 ; CHECK-NEXT:    movslq %edx, %rax
 ; CHECK-NEXT:    xorl %ecx, %ecx
 ; CHECK-NEXT:    .p2align 4, 0x90
-; CHECK-NEXT:  LBB0_5: ## %for.body
+; CHECK-NEXT:  LBB0_2: ## %for.body
 ; CHECK-NEXT:    ## =>This Inner Loop Header: Depth=1
 ; CHECK-NEXT:    cmpl %edi, (%rsi,%rcx,4)
 ; CHECK-NEXT:    je LBB0_6
-; CHECK-NEXT:  ## %bb.2: ## %for.cond
-; CHECK-NEXT:    ## in Loop: Header=BB0_5 Depth=1
+; CHECK-NEXT:  ## %bb.3: ## %for.cond
+; CHECK-NEXT:    ## in Loop: Header=BB0_2 Depth=1
 ; CHECK-NEXT:    incq %rcx
 ; CHECK-NEXT:    cmpq %rax, %rcx
-; CHECK-NEXT:    jl LBB0_5
-;            ### FIXME: %bb.3 and LBB0_1 should be merged
-; CHECK-NEXT:  ## %bb.3:
-; CHECK-NEXT:    xorl %eax, %eax
-; CHECK-NEXT:    ## kill: def $al killed $al killed $eax
-; CHECK-NEXT:    retq
-; CHECK-NEXT:  LBB0_1:
+; CHECK-NEXT:    jl LBB0_2
+; CHECK-NEXT:  LBB0_5:
 ; CHECK-NEXT:    xorl %eax, %eax
 ; CHECK-NEXT:    ## kill: def $al killed $al killed $eax
 ; CHECK-NEXT:    retq
 ; CHECK-NEXT:  LBB0_6:
 ; CHECK-NEXT:    movb $1, %al
 ; CHECK-NEXT:    ## kill: def $al killed $al killed $eax
 ; CHECK-NEXT:    retq
 entry:

test/CodeGen/X86/machine-cp.ll

 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc < %s -mtriple=x86_64-apple-macosx -mattr=+sse2 -verify-machineinstrs | FileCheck %s
 
 ; After tail duplication, two copies in an early exit BB can be cancelled out.
 ; rdar://10640363
 define i32 @t1(i32 %a, i32 %b) nounwind  {
 ; CHECK-LABEL: t1:
 ; CHECK:       ## %bb.0: ## %entry
 ; CHECK-NEXT:    movl %edi, %eax
 ; CHECK-NEXT:    testl %esi, %esi
-; CHECK-NEXT:    je LBB0_1
-; CHECK-NEXT:  ## %bb.2: ## %while.body.preheader
+; CHECK-NEXT:    je LBB0_4
+; CHECK-NEXT:  ## %bb.1: ## %while.body.preheader
 ; CHECK-NEXT:    movl %esi, %edx
 ; CHECK-NEXT:    .p2align 4, 0x90
-; CHECK-NEXT:  LBB0_3: ## %while.body
+; CHECK-NEXT:  LBB0_2: ## %while.body
 ; CHECK-NEXT:    ## =>This Inner Loop Header: Depth=1
 ; CHECK-NEXT:    movl %edx, %ecx
 ; CHECK-NEXT:    cltd
 ; CHECK-NEXT:    idivl %ecx
 ; CHECK-NEXT:    testl %edx, %edx
 ; CHECK-NEXT:    movl %ecx, %eax
-; CHECK-NEXT:    jne LBB0_3
-; CHECK-NEXT:  ## %bb.4: ## %while.end
+; CHECK-NEXT:    jne LBB0_2
+; CHECK-NEXT:  ## %bb.3: ## %while.end
 ; CHECK-NEXT:    movl %ecx, %eax
-; CHECK-NEXT:    retq
-; CHECK-NEXT:  LBB0_1:
+; CHECK-NEXT:  LBB0_4:
 ; CHECK-NEXT:    retq
 entry:
   %cmp1 = icmp eq i32 %b, 0
   br i1 %cmp1, label %while.end, label %while.body
 
 while.body:                                       ; preds = %entry, %while.body
   %a.addr.03 = phi i32 [ %b.addr.02, %while.body ], [ %a, %entry ]
   %b.addr.02 = phi i32 [ %rem, %while.body ], [ %b, %entry ]
entry:
   ret <8 x i16> %tmp8
 }
 
 define i32 @t3(i64 %a, i64 %b) nounwind  {
 ; CHECK-LABEL: t3:
 ; CHECK:       ## %bb.0: ## %entry
 ; CHECK-NEXT:    movq %rdi, %rax
 ; CHECK-NEXT:    testq %rsi, %rsi
-; CHECK-NEXT:    je LBB2_1
-; CHECK-NEXT:  ## %bb.2: ## %while.body.preheader
+; CHECK-NEXT:    je LBB2_4
+; CHECK-NEXT:  ## %bb.1: ## %while.body.preheader
 ; CHECK-NEXT:    movq %rsi, %rdx
 ; CHECK-NEXT:    .p2align 4, 0x90
-; CHECK-NEXT:  LBB2_3: ## %while.body
+; CHECK-NEXT:  LBB2_2: ## %while.body
 ; CHECK-NEXT:    ## =>This Inner Loop Header: Depth=1
 ; CHECK-NEXT:    movq %rdx, %rcx
 ; CHECK-NEXT:    cqto
 ; CHECK-NEXT:    idivq %rcx
 ; CHECK-NEXT:    testq %rdx, %rdx
 ; CHECK-NEXT:    movq %rcx, %rax
-; CHECK-NEXT:    jne LBB2_3
-; CHECK-NEXT:  ## %bb.4: ## %while.end
+; CHECK-NEXT:    jne LBB2_2
+; CHECK-NEXT:  ## %bb.3: ## %while.end
 ; CHECK-NEXT:    movl %ecx, %eax
-; CHECK-NEXT:    retq
-; CHECK-NEXT:  LBB2_1:
+; CHECK-NEXT:  LBB2_4:
 ; CHECK-NEXT:    retq
 entry:
   %cmp1 = icmp eq i64 %b, 0
   br i1 %cmp1, label %while.end, label %while.body
 
 while.body:                                       ; preds = %entry, %while.body
   %a.addr.03 = phi i64 [ %b.addr.02, %while.body ], [ %a, %entry ]
   %b.addr.02 = phi i64 [ %rem, %while.body ], [ %b, %entry ]

test/CodeGen/X86/mul-constant-result.ll

 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %ecx
 ; X86-NEXT:    testl %edx, %edx
 ; X86-NEXT:    je .LBB0_4
 ; X86-NEXT:  # %bb.3:
 ; X86-NEXT:    movl %esi, %eax
 ; X86-NEXT:  .LBB0_4:
 ; X86-NEXT:    decl %ecx
 ; X86-NEXT:    cmpl $31, %ecx
-; X86-NEXT:    ja .LBB0_39
+; X86-NEXT:    ja .LBB0_7
 ; X86-NEXT:  # %bb.5:
 ; X86-NEXT:    jmpl *.LJTI0_0(,%ecx,4)
 ; X86-NEXT:  .LBB0_6:
 ; X86-NEXT:    addl %eax, %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_39:
-; X86-NEXT:    .cfi_def_cfa_offset 8
-; X86-NEXT:    xorl %eax, %eax
-; X86-NEXT:  .LBB0_40:
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
 ; X86-NEXT:  .LBB0_7:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
-; X86-NEXT:    leal (%eax,%eax,2), %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
+; X86-NEXT:    xorl %eax, %eax
 ; X86-NEXT:  .LBB0_8:
-; X86-NEXT:    .cfi_def_cfa_offset 8
-; X86-NEXT:    shll $2, %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_9:
-; X86-NEXT:    .cfi_def_cfa_offset 8
-; X86-NEXT:    leal (%eax,%eax,4), %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
 ; X86-NEXT:  .LBB0_10:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
-; X86-NEXT:    addl %eax, %eax
-; X86-NEXT:    leal (%eax,%eax,2), %eax
+; X86-NEXT:    shll $2, %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_11:
+; X86-NEXT:  .LBB0_12:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
-; X86-NEXT:    leal (,%eax,8), %ecx
-; X86-NEXT:    jmp .LBB0_12
+; X86-NEXT:    addl %eax, %eax
+; X86-NEXT:    jmp .LBB0_9
 ; X86-NEXT:  .LBB0_13:
-; X86-NEXT:    shll $3, %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
+; X86-NEXT:    leal (,%eax,8), %ecx
+; X86-NEXT:    jmp .LBB0_41
 ; X86-NEXT:  .LBB0_14:
-; X86-NEXT:    .cfi_def_cfa_offset 8
-; X86-NEXT:    leal (%eax,%eax,8), %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_15:
-; X86-NEXT:    .cfi_def_cfa_offset 8
-; X86-NEXT:    addl %eax, %eax
-; X86-NEXT:    leal (%eax,%eax,4), %eax
+; X86-NEXT:    shll $3, %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
 ; X86-NEXT:  .LBB0_16:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
-; X86-NEXT:    leal (%eax,%eax,4), %ecx
-; X86-NEXT:    leal (%eax,%ecx,2), %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
+; X86-NEXT:    addl %eax, %eax
+; X86-NEXT:    jmp .LBB0_11
 ; X86-NEXT:  .LBB0_17:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    leal (%eax,%eax,4), %ecx
+; X86-NEXT:    jmp .LBB0_18
+; X86-NEXT:  .LBB0_19:
 ; X86-NEXT:    shll $2, %eax
-; X86-NEXT:    leal (%eax,%eax,2), %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_18:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    jmp .LBB0_9
+; X86-NEXT:  .LBB0_20:
 ; X86-NEXT:    leal (%eax,%eax,2), %ecx
-; X86-NEXT:    leal (%eax,%ecx,4), %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_19:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    jmp .LBB0_21
+; X86-NEXT:  .LBB0_22:
 ; X86-NEXT:    movl %eax, %ecx
 ; X86-NEXT:    shll $4, %ecx
 ; X86-NEXT:    subl %eax, %ecx
-; X86-NEXT:    jmp .LBB0_12
-; X86-NEXT:  .LBB0_21:
+; X86-NEXT:    jmp .LBB0_41
+; X86-NEXT:  .LBB0_23:
 ; X86-NEXT:    leal (%eax,%eax,4), %eax
-; X86-NEXT:    leal (%eax,%eax,2), %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_22:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    jmp .LBB0_9
+; X86-NEXT:  .LBB0_24:
 ; X86-NEXT:    shll $4, %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_23:
+; X86-NEXT:  .LBB0_25:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
 ; X86-NEXT:    movl %eax, %ecx
 ; X86-NEXT:    shll $4, %ecx
-; X86-NEXT:    addl %ecx, %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_24:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    jmp .LBB0_26
+; X86-NEXT:  .LBB0_27:
 ; X86-NEXT:    addl %eax, %eax
+; X86-NEXT:  .LBB0_15:
 ; X86-NEXT:    leal (%eax,%eax,8), %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_25:
+; X86-NEXT:  .LBB0_28:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
 ; X86-NEXT:    leal (%eax,%eax,8), %ecx
+; X86-NEXT:  .LBB0_18:
 ; X86-NEXT:    leal (%eax,%ecx,2), %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_26:
+; X86-NEXT:  .LBB0_29:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
 ; X86-NEXT:    shll $2, %eax
-; X86-NEXT:    leal (%eax,%eax,4), %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_27:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    jmp .LBB0_11
+; X86-NEXT:  .LBB0_30:
 ; X86-NEXT:    leal (%eax,%eax,4), %ecx
+; X86-NEXT:  .LBB0_21:
 ; X86-NEXT:    leal (%eax,%ecx,4), %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_28:
+; X86-NEXT:  .LBB0_31:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
 ; X86-NEXT:    leal (%eax,%eax,4), %ecx
 ; X86-NEXT:    leal (%eax,%ecx,4), %ecx
-; X86-NEXT:    addl %ecx, %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_29:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    jmp .LBB0_26
+; X86-NEXT:  .LBB0_32:
 ; X86-NEXT:    leal (%eax,%eax,2), %ecx
 ; X86-NEXT:    shll $3, %ecx
-; X86-NEXT:    jmp .LBB0_12
-; X86-NEXT:  .LBB0_30:
+; X86-NEXT:    jmp .LBB0_41
+; X86-NEXT:  .LBB0_33:
 ; X86-NEXT:    shll $3, %eax
-; X86-NEXT:    leal (%eax,%eax,2), %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_31:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    jmp .LBB0_9
+; X86-NEXT:  .LBB0_34:
 ; X86-NEXT:    leal (%eax,%eax,4), %eax
+; X86-NEXT:  .LBB0_11:
 ; X86-NEXT:    leal (%eax,%eax,4), %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_32:
+; X86-NEXT:  .LBB0_35:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
 ; X86-NEXT:    leal (%eax,%eax,4), %ecx
 ; X86-NEXT:    leal (%ecx,%ecx,4), %ecx
-; X86-NEXT:    addl %ecx, %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_33:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    jmp .LBB0_26
+; X86-NEXT:  .LBB0_36:
 ; X86-NEXT:    leal (%eax,%eax,8), %eax
+; X86-NEXT:  .LBB0_9:
 ; X86-NEXT:    leal (%eax,%eax,2), %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_34:
+; X86-NEXT:  .LBB0_37:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
 ; X86-NEXT:    leal (%eax,%eax,8), %ecx
 ; X86-NEXT:    leal (%ecx,%ecx,2), %ecx
-; X86-NEXT:    addl %ecx, %eax
-; X86-NEXT:    popl %esi
-; X86-NEXT:    .cfi_def_cfa_offset 4
-; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_35:
-; X86-NEXT:    .cfi_def_cfa_offset 8
+; X86-NEXT:    jmp .LBB0_26
+; X86-NEXT:  .LBB0_38:
 ; X86-NEXT:    leal (%eax,%eax,8), %ecx
 ; X86-NEXT:    leal (%ecx,%ecx,2), %ecx
 ; X86-NEXT:    addl %eax, %ecx
+; X86-NEXT:  .LBB0_26:
 ; X86-NEXT:    addl %ecx, %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_36:
+; X86-NEXT:  .LBB0_39:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
 ; X86-NEXT:    movl %eax, %ecx
 ; X86-NEXT:    shll $5, %ecx
 ; X86-NEXT:    subl %eax, %ecx
-; X86-NEXT:    jmp .LBB0_12
-; X86-NEXT:  .LBB0_37:
+; X86-NEXT:    jmp .LBB0_41
+; X86-NEXT:  .LBB0_40:
 ; X86-NEXT:    movl %eax, %ecx
 ; X86-NEXT:    shll $5, %ecx
-; X86-NEXT:  .LBB0_12:
+; X86-NEXT:  .LBB0_41:
 ; X86-NEXT:    subl %eax, %ecx
 ; X86-NEXT:    movl %ecx, %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
-; X86-NEXT:  .LBB0_38:
+; X86-NEXT:  .LBB0_42:
 ; X86-NEXT:    .cfi_def_cfa_offset 8
 ; X86-NEXT:    shll $5, %eax
 ; X86-NEXT:    popl %esi
 ; X86-NEXT:    .cfi_def_cfa_offset 4
 ; X86-NEXT:    retl
 ;
 ; X64-HSW-LABEL: mult:
 ; X64-HSW:       # %bb.0:
 ; X64-HSW-NEXT:    # kill: def $edi killed $edi def $rdi
 ; X64-HSW-NEXT:    cmpl $1, %esi
 ; X64-HSW-NEXT:    movl $1, %ecx
 ; X64-HSW-NEXT:    movl %esi, %eax
 ; X64-HSW-NEXT:    cmovgl %ecx, %eax
 ; X64-HSW-NEXT:    testl %esi, %esi
 ; X64-HSW-NEXT:    cmovel %ecx, %eax
 ; X64-HSW-NEXT:    decl %edi
 ; X64-HSW-NEXT:    cmpl $31, %edi
-; X64-HSW-NEXT:    ja .LBB0_36
+; X64-HSW-NEXT:    ja .LBB0_3
 ; X64-HSW-NEXT:  # %bb.1:
 ; X64-HSW-NEXT:    jmpq *.LJTI0_0(,%rdi,8)
 ; X64-HSW-NEXT:  .LBB0_2:
 ; X64-HSW-NEXT:    addl %eax, %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_36:
-; X64-HSW-NEXT:    xorl %eax, %eax
-; X64-HSW-NEXT:  .LBB0_37:
-; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
-; X64-HSW-NEXT:    retq
 ; X64-HSW-NEXT:  .LBB0_3:
-; X64-HSW-NEXT:    leal (%rax,%rax,2), %eax
-; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
-; X64-HSW-NEXT:    retq
+; X64-HSW-NEXT:    xorl %eax, %eax
 ; X64-HSW-NEXT:  .LBB0_4:
-; X64-HSW-NEXT:    shll $2, %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_5:
-; X64-HSW-NEXT:    leal (%rax,%rax,4), %eax
+; X64-HSW-NEXT:  .LBB0_6:
+; X64-HSW-NEXT:    shll $2, %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_6:
+; X64-HSW-NEXT:  .LBB0_8:
 ; X64-HSW-NEXT:    addl %eax, %eax
+; X64-HSW-NEXT:  .LBB0_5:
 ; X64-HSW-NEXT:    leal (%rax,%rax,2), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_7:
-; X64-HSW-NEXT:    leal (,%rax,8), %ecx
-; X64-HSW-NEXT:    jmp .LBB0_8
 ; X64-HSW-NEXT:  .LBB0_9:
-; X64-HSW-NEXT:    shll $3, %eax
-; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
-; X64-HSW-NEXT:    retq
+; X64-HSW-NEXT:    leal (,%rax,8), %ecx
+; X64-HSW-NEXT:    jmp .LBB0_37
 ; X64-HSW-NEXT:  .LBB0_10:
-; X64-HSW-NEXT:    leal (%rax,%rax,8), %eax
+; X64-HSW-NEXT:    shll $3, %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_11:
+; X64-HSW-NEXT:  .LBB0_12:
 ; X64-HSW-NEXT:    addl %eax, %eax
+; X64-HSW-NEXT:  .LBB0_7:
 ; X64-HSW-NEXT:    leal (%rax,%rax,4), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_12:
+; X64-HSW-NEXT:  .LBB0_13:
 ; X64-HSW-NEXT:    leal (%rax,%rax,4), %ecx
 ; X64-HSW-NEXT:    leal (%rax,%rcx,2), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_13:
+; X64-HSW-NEXT:  .LBB0_15:
 ; X64-HSW-NEXT:    shll $2, %eax
 ; X64-HSW-NEXT:    leal (%rax,%rax,2), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_14:
+; X64-HSW-NEXT:  .LBB0_16:
 ; X64-HSW-NEXT:    leal (%rax,%rax,2), %ecx
 ; X64-HSW-NEXT:    leal (%rax,%rcx,4), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_15:
+; X64-HSW-NEXT:  .LBB0_18:
 ; X64-HSW-NEXT:    movl %eax, %ecx
 ; X64-HSW-NEXT:    shll $4, %ecx
 ; X64-HSW-NEXT:    subl %eax, %ecx
-; X64-HSW-NEXT:    jmp .LBB0_8
-; X64-HSW-NEXT:  .LBB0_17:
+; X64-HSW-NEXT:    jmp .LBB0_37
+; X64-HSW-NEXT:  .LBB0_19:
 ; X64-HSW-NEXT:    leal (%rax,%rax,4), %eax
 ; X64-HSW-NEXT:    leal (%rax,%rax,2), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_18:
+; X64-HSW-NEXT:  .LBB0_20:
 ; X64-HSW-NEXT:    shll $4, %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_19:
+; X64-HSW-NEXT:  .LBB0_21:
 ; X64-HSW-NEXT:    movl %eax, %ecx
 ; X64-HSW-NEXT:    shll $4, %ecx
-; X64-HSW-NEXT:    jmp .LBB0_20
-; X64-HSW-NEXT:  .LBB0_21:
+; X64-HSW-NEXT:    jmp .LBB0_34
+; X64-HSW-NEXT:  .LBB0_22:
 ; X64-HSW-NEXT:    addl %eax, %eax
+; X64-HSW-NEXT:  .LBB0_11:
 ; X64-HSW-NEXT:    leal (%rax,%rax,8), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_22:
+; X64-HSW-NEXT:  .LBB0_23:
 ; X64-HSW-NEXT:    leal (%rax,%rax,8), %ecx
 ; X64-HSW-NEXT:    leal (%rax,%rcx,2), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_23:
+; X64-HSW-NEXT:  .LBB0_24:
 ; X64-HSW-NEXT:    shll $2, %eax
 ; X64-HSW-NEXT:    leal (%rax,%rax,4), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_24:
+; X64-HSW-NEXT:  .LBB0_25:
 ; X64-HSW-NEXT:    leal (%rax,%rax,4), %ecx
 ; X64-HSW-NEXT:    leal (%rax,%rcx,4), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_25:
+; X64-HSW-NEXT:  .LBB0_26:
 ; X64-HSW-NEXT:    leal (%rax,%rax,4), %ecx
 ; X64-HSW-NEXT:    leal (%rax,%rcx,4), %ecx
-; X64-HSW-NEXT:    jmp .LBB0_20
-; X64-HSW-NEXT:  .LBB0_26:
+; X64-HSW-NEXT:    jmp .LBB0_34
+; X64-HSW-NEXT:  .LBB0_27:
 ; X64-HSW-NEXT:    leal (%rax,%rax,2), %ecx
 ; X64-HSW-NEXT:    shll $3, %ecx
-; X64-HSW-NEXT:    jmp .LBB0_8
-; X64-HSW-NEXT:  .LBB0_27:
+; X64-HSW-NEXT:    jmp .LBB0_37
+; X64-HSW-NEXT:  .LBB0_28:
 ; X64-HSW-NEXT:    shll $3, %eax
 ; X64-HSW-NEXT:    leal (%rax,%rax,2), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_28:
+; X64-HSW-NEXT:  .LBB0_29:
 ; X64-HSW-NEXT:    leal (%rax,%rax,4), %eax
 ; X64-HSW-NEXT:    leal (%rax,%rax,4), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_29:
+; X64-HSW-NEXT:  .LBB0_30:
 ; X64-HSW-NEXT:    leal (%rax,%rax,4), %ecx
 ; X64-HSW-NEXT:    leal (%rcx,%rcx,4), %ecx
-; X64-HSW-NEXT:    jmp .LBB0_20
-; X64-HSW-NEXT:  .LBB0_30:
+; X64-HSW-NEXT:    jmp .LBB0_34
+; X64-HSW-NEXT:  .LBB0_31:
 ; X64-HSW-NEXT:    leal (%rax,%rax,8), %eax
 ; X64-HSW-NEXT:    leal (%rax,%rax,2), %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_31:
+; X64-HSW-NEXT:  .LBB0_32:
 ; X64-HSW-NEXT:    leal (%rax,%rax,8), %ecx
 ; X64-HSW-NEXT:    leal (%rcx,%rcx,2), %ecx
-; X64-HSW-NEXT:    jmp .LBB0_20
-; X64-HSW-NEXT:  .LBB0_32:
+; X64-HSW-NEXT:    jmp .LBB0_34
+; X64-HSW-NEXT:  .LBB0_33:
 ; X64-HSW-NEXT:    leal (%rax,%rax,8), %ecx
 ; X64-HSW-NEXT:    leal (%rcx,%rcx,2), %ecx
 ; X64-HSW-NEXT:    addl %eax, %ecx
-; X64-HSW-NEXT:  .LBB0_20:
+; X64-HSW-NEXT:  .LBB0_34:
 ; X64-HSW-NEXT:    addl %eax, %ecx
 ; X64-HSW-NEXT:    movl %ecx, %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_33:
+; X64-HSW-NEXT:  .LBB0_35:
 ; X64-HSW-NEXT:    movl %eax, %ecx
 ; X64-HSW-NEXT:    shll $5, %ecx
 ; X64-HSW-NEXT:    subl %eax, %ecx
-; X64-HSW-NEXT:    jmp .LBB0_8
-; X64-HSW-NEXT:  .LBB0_34:
+; X64-HSW-NEXT:    jmp .LBB0_37
+; X64-HSW-NEXT:  .LBB0_36:
 ; X64-HSW-NEXT:    movl %eax, %ecx
 ; X64-HSW-NEXT:    shll $5, %ecx
-; X64-HSW-NEXT:  .LBB0_8:
+; X64-HSW-NEXT:  .LBB0_37:
 ; X64-HSW-NEXT:    subl %eax, %ecx
 ; X64-HSW-NEXT:    movl %ecx, %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
-; X64-HSW-NEXT:  .LBB0_35:
+; X64-HSW-NEXT:  .LBB0_39:
 ; X64-HSW-NEXT:    shll $5, %eax
 ; X64-HSW-NEXT:    # kill: def $eax killed $eax killed $rax
 ; X64-HSW-NEXT:    retq
   %3 = icmp eq i32 %1, 0
   %4 = icmp sgt i32 %1, 1
   %5 = or i1 %3, %4
   %6 = select i1 %5, i32 1, i32 %1
   switch i32 %0, label %69 [

test/CodeGen/X86/tail-merge-after-mbp.mir

 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
 # RUN: llc -mtriple=x86_64-linux -run-pass=block-placement -o - %s | FileCheck %s
 
 ---
 # check loop bb.7 is not merged with bb.10, bb.13
 # check loop bb.9 is not merged with bb.12
 
 name:            foo
 body:             |
   ; CHECK-LABEL: name: foo
   ; CHECK: bb.0:
   ; CHECK:   successors: %bb.1(0x40000000), %bb.2(0x40000000)
   ; CHECK:   TEST8ri $dl, 1, implicit-def $eflags, implicit killed $edx
-  ; CHECK:   JCC_1 %bb.2, 4, implicit $eflags
-  ; CHECK: bb.1:
-  ; CHECK:   $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
-  ; CHECK:   RETQ $eax
+  ; CHECK:   JCC_1 %bb.1, 5, implicit $eflags
   ; CHECK: bb.2:
-  ; CHECK:   successors: %bb.3(0x30000000), %bb.4(0x50000000)
+  ; CHECK:   successors: %bb.1(0x30000000), %bb.3(0x50000000)
   ; CHECK:   $rax = MOV64rm $r14, 1, $noreg, 0, $noreg :: (load 8)
   ; CHECK:   TEST64rr $rax, $rax, implicit-def $eflags
-  ; CHECK:   JCC_1 %bb.3, 4, implicit $eflags
-  ; CHECK: bb.4:
-  ; CHECK:   successors: %bb.5(0x30000000), %bb.10(0x50000000)
+  ; CHECK:   JCC_1 %bb.1, 4, implicit $eflags
+  ; CHECK: bb.3:
+  ; CHECK:   successors: %bb.4(0x30000000), %bb.8(0x50000000)
   ; CHECK:   CMP64mi8 killed $rax, 1, $noreg, 8, $noreg, 0, implicit-def $eflags :: (load 8)
-  ; CHECK:   JCC_1 %bb.10, 5, implicit $eflags
-  ; CHECK: bb.5:
-  ; CHECK:   successors: %bb.6(0x30000000), %bb.7(0x50000000)
+  ; CHECK:   JCC_1 %bb.8, 5, implicit $eflags
+  ; CHECK: bb.4:
+  ; CHECK:   successors: %bb.1(0x30000000), %bb.5(0x50000000)
   ; CHECK:   $rax = MOV64rm $r14, 1, $noreg, 0, $noreg :: (load 8)
   ; CHECK:   TEST64rr $rax, $rax, implicit-def $eflags
-  ; CHECK:   JCC_1 %bb.6, 4, implicit $eflags
-  ; CHECK: bb.7 (align 4):
-  ; CHECK:   successors: %bb.8(0x71555555), %bb.10(0x0eaaaaab)
+  ; CHECK:   JCC_1 %bb.1, 4, implicit $eflags
+  ; CHECK: bb.5 (align 4):
+  ; CHECK:   successors: %bb.6(0x71555555), %bb.8(0x0eaaaaab)
   ; CHECK:   CMP64mi8 killed $rax, 1, $noreg, 8, $noreg, 0, implicit-def $eflags :: (load 8), (load 8)
-  ; CHECK:   JCC_1 %bb.10, 5, implicit $eflags
-  ; CHECK: bb.8:
-  ; CHECK:   successors: %bb.9(0x04000000), %bb.7(0x7c000000)
+  ; CHECK:   JCC_1 %bb.8, 5, implicit $eflags
+  ; CHECK: bb.6:
+  ; CHECK:   successors: %bb.1(0x04000000), %bb.5(0x7c000000)
   ; CHECK:   $rax = MOV64rm $r14, 1, $noreg, 0, $noreg :: (load 8)
   ; CHECK:   TEST64rr $rax, $rax, implicit-def $eflags
-  ; CHECK:   JCC_1 %bb.7, 5, implicit $eflags
-  ; CHECK: bb.9:
+  ; CHECK:   JCC_1 %bb.5, 5, implicit $eflags
+  ; CHECK: bb.1:
   ; CHECK:   $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
   ; CHECK:   RETQ $eax
-  ; CHECK: bb.10:
+  ; CHECK: bb.8:
   ; CHECK:   $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
   ; CHECK:   dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al
   ; CHECK:   RETQ $eax
-  ; CHECK: bb.3:
-  ; CHECK:   $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
-  ; CHECK:   RETQ $eax
-  ; CHECK: bb.6:
-  ; CHECK:   $ebp = XOR32rr undef $ebp, undef $ebp, implicit-def dead $eflags
-  ; CHECK:   RETQ $eax
   bb.0:
     successors: %bb.1(0x40000000), %bb.7(0x40000000)
 
     TEST8ri $dl, 1, implicit-def $eflags, implicit killed $edx
     JCC_1 %bb.7, 4, implicit $eflags
 
   bb.1:
     successors: %bb.16(0x80000000)

test/CodeGen/X86/tail-opts.ll

 
 return:
   ret void
 }
 
 ; two_nosize - Same as two, but without the optsize attribute.
 ; Now two instructions are enough to be tail-duplicated.
 
-define void @two_nosize() nounwind {
+define void @two_nosize(i32 %x, i32 %y, i32 %z) nounwind {
 ; CHECK-LABEL: two_nosize:
 ; CHECK:       # %bb.0: # %entry
-; CHECK-NEXT:    xorl %eax, %eax
-; CHECK-NEXT:    testb %al, %al
-; CHECK-NEXT:    jne .LBB8_3
+; CHECK-NEXT:    testl %edi, %edi
+; CHECK-NEXT:    je .LBB8_3
 ; CHECK-NEXT:  # %bb.1: # %bby
-; CHECK-NEXT:    xorl %eax, %eax
-; CHECK-NEXT:    testb %al, %al
-; CHECK-NEXT:    jne .LBB8_4
+; CHECK-NEXT:    testl %esi, %esi
+; CHECK-NEXT:    je .LBB8_4
 ; CHECK-NEXT:  # %bb.2: # %bb7
 ; CHECK-NEXT:    movl $0, {{.*}}(%rip)
 ; CHECK-NEXT:    jmp tail_call_me # TAILCALL
 ; CHECK-NEXT:  .LBB8_3: # %bbx
-; CHECK-NEXT:    xorl %eax, %eax
-; CHECK-NEXT:    testb %al, %al
-; CHECK-NEXT:    je .LBB8_5
-; CHECK-NEXT:  .LBB8_4: # %return
-; CHECK-NEXT:    retq
-; CHECK-NEXT:  .LBB8_5: # %bb12
+; CHECK-NEXT:    cmpl $-1, %edx
+; CHECK-NEXT:    je .LBB8_4
+; CHECK-NEXT:  # %bb.5: # %bb12
 ; CHECK-NEXT:    movl $0, {{.*}}(%rip)
 ; CHECK-NEXT:    jmp tail_call_me # TAILCALL
+; CHECK-NEXT:  .LBB8_4: # %return
+; CHECK-NEXT:    retq
 entry:
-  %0 = icmp eq i32 undef, 0
+  %0 = icmp eq i32 %x, 0
   br i1 %0, label %bbx, label %bby
 
 bby:
-  switch i32 undef, label %bb7 [
-    i32 16, label %return
+  switch i32 %y, label %bb7 [
+    i32 0, label %return
   ]
 
 bb7:
   store volatile i32 0, i32* @XYZ
   tail call void @tail_call_me()
   ret void
 
 bbx:
-  switch i32 undef, label %bb12 [
-    i32 128, label %return
+  switch i32 %z, label %bb12 [
+    i32 -1, label %return
   ]
 
 bb12:
   store volatile i32 0, i32* @XYZ
   tail call void @tail_call_me()
   ret void
 
 return:
   ret void
 }

test/CodeGen/X86/tail-threshold.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=x86_64-pc-linux-gnu -tail-merge-threshold 2 < %s | FileCheck %s
 
 ; Test that we still do some merging if a block has more than
 ; tail-merge-threshold predecessors.
 
-; CHECK:  callq bar
-; CHECK:  callq bar
-; CHECK:  callq bar
-; CHECK-NOT:    callq
-
 declare void @bar()
 
-define void @foo(i32 %xxx) {
-entry:
+define void @foo(i32 %xxx) nounwind {
+; CHECK-LABEL: foo:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    cmpl $3, %edi
+; CHECK-NEXT:    ja .LBB0_4
+; CHECK-NEXT:  # %bb.1:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    jmpq *.LJTI0_0(,%rax,8)
+; CHECK-NEXT:  .LBB0_3: # %bb3
+; CHECK-NEXT:    callq bar
+; CHECK-NEXT:    popq %rax
+; CHECK-NEXT:    retq
+; CHECK-NEXT:  .LBB0_4: # %bb4
+; CHECK-NEXT:    callq bar
+; CHECK-NEXT:    popq %rax
+; CHECK-NEXT:    retq
   switch i32 %xxx, label %bb4 [
     i32 0, label %bb0
     i32 1, label %bb1
     i32 2, label %bb2
     i32 3, label %bb3
   ]
 
 bb0:

test/CodeGen/X86/test-shrink-bug.ll

 ; CHECK-X86-LABEL: fail:
 ; CHECK-X86:       ## %bb.0:
 ; CHECK-X86-NEXT:    subl $12, %esp
 ; CHECK-X86-NEXT:    .cfi_def_cfa_offset 16
 ; CHECK-X86-NEXT:    movzwl {{[0-9]+}}(%esp), %ecx
 ; CHECK-X86-NEXT:    cmpb $123, {{[0-9]+}}(%esp)
 ; CHECK-X86-NEXT:    sete %al
 ; CHECK-X86-NEXT:    testl $263, %ecx ## imm = 0x107
-; CHECK-X86-NEXT:    je LBB1_2
+; CHECK-X86-NEXT:    je LBB1_3
 ; CHECK-X86-NEXT:  ## %bb.1:
 ; CHECK-X86-NEXT:    testb %al, %al
-; CHECK-X86-NEXT:    jne LBB1_2
-; CHECK-X86-NEXT:  ## %bb.3: ## %no
+; CHECK-X86-NEXT:    jne LBB1_3
+; CHECK-X86-NEXT:  ## %bb.2: ## %no
 ; CHECK-X86-NEXT:    calll _bar
-; CHECK-X86-NEXT:    addl $12, %esp
-; CHECK-X86-NEXT:    retl
-; CHECK-X86-NEXT:  LBB1_2: ## %yes
+; CHECK-X86-NEXT:  LBB1_3: ## %yes
 ; CHECK-X86-NEXT:    addl $12, %esp
 ; CHECK-X86-NEXT:    retl
 ;
 ; CHECK-X64-LABEL: fail:
 ; CHECK-X64:       # %bb.0:
 ; CHECK-X64-NEXT:    pushq %rax
 ; CHECK-X64-NEXT:    .cfi_def_cfa_offset 16
 ; CHECK-X64-NEXT:    testl $263, %edi # imm = 0x107
-; CHECK-X64-NEXT:    je .LBB1_2
+; CHECK-X64-NEXT:    je .LBB1_3
 ; CHECK-X64-NEXT:  # %bb.1:
 ; CHECK-X64-NEXT:    pand {{.*}}(%rip), %xmm0
 ; CHECK-X64-NEXT:    pcmpeqd {{.*}}(%rip), %xmm0
 ; CHECK-X64-NEXT:    pshufd {{.*#+}} xmm1 = xmm0[1,0,3,2]
 ; CHECK-X64-NEXT:    pand %xmm0, %xmm1
 ; CHECK-X64-NEXT:    pextrw $4, %xmm1, %eax
 ; CHECK-X64-NEXT:    testb $1, %al
-; CHECK-X64-NEXT:    jne .LBB1_2
-; CHECK-X64-NEXT:  # %bb.3: # %no
+; CHECK-X64-NEXT:    jne .LBB1_3
+; CHECK-X64-NEXT:  # %bb.2: # %no
 ; CHECK-X64-NEXT:    callq bar
-; CHECK-X64-NEXT:    popq %rax
-; CHECK-X64-NEXT:    .cfi_def_cfa_offset 8
-; CHECK-X64-NEXT:    retq
-; CHECK-X64-NEXT:  .LBB1_2: # %yes
-; CHECK-X64-NEXT:    .cfi_def_cfa_offset 16
+; CHECK-X64-NEXT:  .LBB1_3: # %yes
 ; CHECK-X64-NEXT:    popq %rax
 ; CHECK-X64-NEXT:    .cfi_def_cfa_offset 8
 ; CHECK-X64-NEXT:    retq
   %1 = icmp eq <2 x i8> %b, <i8 40, i8 123>
   %2 = extractelement <2 x i1> %1, i32 1
   %3 = and i16 %a, 263
   %4 = icmp eq i16 %3, 0
   %merge = or i1 %4, %2