[X86] Expand transform (icmp eq/ne (ABS A), C) -> (and/or (icmp eq/ne A, C), (icmp eq/ne A, -C))

[goldstein.w.n]

Summary

This also makes sense if A is a vector type with i64 elements but
the target doesn't have avx512 but has avx2/sse4.1 (for ymm/xmm respectively).

In that case ABS will expand with 3 instructions `blendv(A, sub(set0,
A))` so its better to just to transform the version with fewer/faster
instructions.

[goldstein.w.n]

Should this be merged with D142345?
Also this has a habit causing extra constants to manifest, maybe not worth it? Or could guard behind a check that the necessary constant nodes already exist. Seems worth it but maybe not.

[goldstein.w.n]

Rebase

[goldstein.w.n]

Rebase

[goldstein.w.n]

ping.

[RKSimon]

llvm/lib/Target/X86/X86ISelLowering.cpp

53450

SSE41 implies SSE2

[RKSimon]

llvm/lib/Target/X86/X86ISelLowering.cpp

53461

Doesn't this need to apply to the vector cases as well?

[goldstein.w.n]

llvm/lib/Target/X86/X86ISelLowering.cpp

53461

Doesn't this need to apply to the vector cases as well?

No, for the scalar case we have a little hack to handle (X == Pow2C || X == -Pow2C) which is the only case this is really worth it.

For the vector case if there is no fast abs its preferable for an arbitrary C to do X == C || X == -C as opposed to Abs(X) == Abs(C).

[goldstein.w.n]

Remove unnecessary sse2 check + fixup commit

[goldstein.w.n]

ping

[RKSimon]

llvm/lib/Target/X86/X86ISelLowering.cpp

53461

In which case, could we move the isConstOrConstSplat check inside the isScalarInteger test and replace the -CInt with getNode() / FoldConstantArithmetic() ?

[goldstein.w.n]

llvm/lib/Target/X86/X86ISelLowering.cpp

53461

What do you mean by this? As in don't go through APInt to get the value of C/-C? Is there an issue how with it is now?

[pengfei]

llvm/lib/Target/X86/X86ISelLowering.cpp

53465

whereas

53465

The comment is not clear to me. Can you refactor it?

53466

is

llvm/test/CodeGen/X86/icmp-abs-C-vec.ll

104–107

I doubt if this is beneficial. The transform neither reduces instructions nor improves throughput, but it introduces extra memory load. WDYT?

[goldstein.w.n]

llvm/test/CodeGen/X86/icmp-abs-C-vec.ll

104–107

It's not a lot more memory, only 8 more bytes for the broadcast. If the new constant micro-fused with the vpcmp then it would be +32 bytes but save a true instruction.

Also note vblendvpd is 2 uops, not 1.

But I see the point. Think it would generally make sense as in a loop the load can be hoisted in which case vpcmpeq + vpor is better than vpsub + vblendvpd but granted not by much.

Could make this transform only happen if -C already exists as a node in the DAG, you think that preferable?

[RKSimon]

llvm/lib/Target/X86/X86ISelLowering.cpp

53461

As it is now it will only work for RHS with uniform/splat values - but there doesn't appear to be any reason for the vector case not to work for non-uniform cases

[RKSimon]

Also I'm curious how well this could work on pre-SSSE3 codegen - where we don't have PABS instructions at all

[goldstein.w.n]

In D142602#4121033, @RKSimon wrote:

Also I'm curious how well this could work on pre-SSSE3 codegen - where we don't have PABS instructions at all

Pre ssse3 abs gets the following codegen:

0000000000000000 <abs_v2i64>:
   0:	66 0f 6f c8          	movdqa %xmm0,%xmm1
   4:	66 0f 72 e1 1f       	psrad  $0x1f,%xmm1
   9:	66 0f 70 c9 f5       	pshufd $0xf5,%xmm1,%xmm1
   e:	66 0f ef c1          	pxor   %xmm1,%xmm0
  12:	66 0f fb c1          	psubq  %xmm1,%xmm0
  16:	c3                   	ret    
  17:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  1e:	00 00 

0000000000000020 <abs_v4i32>:
  20:	66 0f 6f c8          	movdqa %xmm0,%xmm1
  24:	66 0f 72 e1 1f       	psrad  $0x1f,%xmm1
  29:	66 0f ef c1          	pxor   %xmm1,%xmm0
  2d:	66 0f fa c1          	psubd  %xmm1,%xmm0
  31:	c3                   	ret    
  32:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  39:	00 00 00 
  3c:	0f 1f 40 00          	nopl   0x0(%rax)

0000000000000040 <abs_v8i16>:
  40:	66 0f ef c9          	pxor   %xmm1,%xmm1
  44:	66 0f f9 c8          	psubw  %xmm0,%xmm1
  48:	66 0f ee c1          	pmaxsw %xmm1,%xmm0
  4c:	c3                   	ret    
  4d:	0f 1f 00             	nopl   (%rax)

0000000000000050 <abs_v16i8>:
  50:	66 0f ef c9          	pxor   %xmm1,%xmm1
  54:	66 0f f8 c8          	psubb  %xmm0,%xmm1
  58:	66 0f da c1          	pminub %xmm1,%xmm0
  5c:	c3                   	ret

Probably makes sense for i64 but for the rest will make this only if the node already exists.

[goldstein.w.n]

In D142602#4121358, @goldstein.w.n wrote:

In D142602#4121033, @RKSimon wrote:

Also I'm curious how well this could work on pre-SSSE3 codegen - where we don't have PABS instructions at all

Pre ssse3 abs gets the following codegen:

0000000000000000 <abs_v2i64>:
   0:	66 0f 6f c8          	movdqa %xmm0,%xmm1
   4:	66 0f 72 e1 1f       	psrad  $0x1f,%xmm1
   9:	66 0f 70 c9 f5       	pshufd $0xf5,%xmm1,%xmm1
   e:	66 0f ef c1          	pxor   %xmm1,%xmm0
  12:	66 0f fb c1          	psubq  %xmm1,%xmm0
  16:	c3                   	ret    
  17:	66 0f 1f 84 00 00 00 	nopw   0x0(%rax,%rax,1)
  1e:	00 00 

0000000000000020 <abs_v4i32>:
  20:	66 0f 6f c8          	movdqa %xmm0,%xmm1
  24:	66 0f 72 e1 1f       	psrad  $0x1f,%xmm1
  29:	66 0f ef c1          	pxor   %xmm1,%xmm0
  2d:	66 0f fa c1          	psubd  %xmm1,%xmm0
  31:	c3                   	ret    
  32:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  39:	00 00 00 
  3c:	0f 1f 40 00          	nopl   0x0(%rax)

0000000000000040 <abs_v8i16>:
  40:	66 0f ef c9          	pxor   %xmm1,%xmm1
  44:	66 0f f9 c8          	psubw  %xmm0,%xmm1
  48:	66 0f ee c1          	pmaxsw %xmm1,%xmm0
  4c:	c3                   	ret    
  4d:	0f 1f 00             	nopl   (%rax)

0000000000000050 <abs_v16i8>:
  50:	66 0f ef c9          	pxor   %xmm1,%xmm1
  54:	66 0f f8 c8          	psubb  %xmm0,%xmm1
  58:	66 0f da c1          	pminub %xmm1,%xmm0
  5c:	c3                   	ret

Probably makes sense for i64 but for the rest will make this only if the node already exists.

For the time being, think I'm going to drop this commit, doesn't seem to be much gain. Might revisit later.

llvm/lib/Target/X86/X86ISelLowering.cpp

         APInt UpperBits = APInt::getBitsSetFrom(SrcVT.getScalarSizeInBits(),
                                                 OpVT.getScalarSizeInBits());
         const TargetLowering &TLI = DAG.getTargetLoweringInfo();
         if (DAG.MaskedValueIsZero(LHS.getOperand(0), UpperBits) &&
             TLI.isTypeLegal(LHS.getOperand(0).getValueType()))
           return DAG.getSetCC(DL, VT, LHS.getOperand(0),
                               DAG.getConstant(0, DL, SrcVT), CC);
       }
+    }
 
-      // With C as a power of 2 and C != 0 and C != INT_MIN:
-      //    icmp eq Abs(X) C ->
-      //        (icmp eq A, C) | (icmp eq A, -C)
-      //    icmp ne Abs(X) C ->
-      //        (icmp ne A, C) & (icmp ne A, -C)
-      // Both of these patterns can be better optimized in
-      // DAGCombiner::foldAndOrOfSETCC. Note this only applies for scalar
-      // integers which is checked above.
-      if (LHS.getOpcode() == ISD::ABS && LHS.hasOneUse()) {
-        if (auto *C = dyn_cast<ConstantSDNode>(RHS)) {
-          const APInt &CInt = C->getAPIntValue();
+    if (OpVT.isInteger() && LHS.getOpcode() == ISD::ABS && LHS.hasOneUse()) {
+      if (auto *C = isConstOrConstSplat(RHS)) {
+        const APInt &CInt = C->getAPIntValue();
+        bool ConvertToLogicOpOfSETCC = false;
+        if (OpVT.isVector() && OpVT.getVectorElementType() == MVT::i64 &&
+            !Subtarget.hasAVX512()) {
+          // If ABS(vNxi64) requires avx512 even for xmm/ymm wereas SETCC/ALU
+          // are available with (sse2/sse4.1)/avx2. If ABS it not available,
+          // check if SETCC/ALU are , and if so, fold.
+          if (OpVT.getSizeInBits() == 128)
+            ConvertToLogicOpOfSETCC =
+                Subtarget.hasSSE41() && Subtarget.hasSSE2();
+          else if (OpVT.getSizeInBits() == 256)
+            ConvertToLogicOpOfSETCC = Subtarget.hasAVX2();
+        } else if (OpVT.isScalarInteger()) {
+          // With C as a power of 2 and C != 0 and C != INT_MIN:
+          //    icmp eq Abs(X) C ->
+          //        (icmp eq A, C) | (icmp eq A, -C)
+          //    icmp ne Abs(X) C ->
+          //        (icmp ne A, C) & (icmp ne A, -C)
           // We can better optimize this case in DAGCombiner::foldAndOrOfSETCC.
-          if (CInt.isPowerOf2() && !CInt.isMinSignedValue()) {
-            SDValue BaseOp = LHS.getOperand(0);
-            SDValue SETCC0 = DAG.getSetCC(DL, VT, BaseOp, RHS, CC);
-            SDValue SETCC1 = DAG.getSetCC(
-                DL, VT, BaseOp, DAG.getConstant(-CInt, DL, OpVT), CC);
-            return DAG.getNode(CC == ISD::SETEQ ? ISD::OR : ISD::AND, DL, VT,
-                               SETCC0, SETCC1);
-          }
+          ConvertToLogicOpOfSETCC =
+              CInt.isPowerOf2() && !CInt.isMinSignedValue();
+        }
+
+        if (ConvertToLogicOpOfSETCC) {
+          SDValue BaseOp = LHS.getOperand(0);
+          SDValue SETCC0 = DAG.getSetCC(DL, VT, BaseOp, RHS, CC);
+          SDValue SETCC1 = DAG.getSetCC(DL, VT, BaseOp,
+                                        DAG.getConstant(-CInt, DL, OpVT), CC);
+          return DAG.getNode(CC == ISD::SETEQ ? ISD::OR : ISD::AND, DL, VT,
+                             SETCC0, SETCC1);
         }
       }
     }
   }
 
   if (VT.isVector() && VT.getVectorElementType() == MVT::i1 &&
       (CC == ISD::SETNE || CC == ISD::SETEQ || ISD::isSignedIntSetCC(CC))) {
     // Using temporaries to avoid messing up operand ordering for later

llvm/test/CodeGen/X86/icmp-abs-C-vec.ll

 ; AVX512-NEXT:    vpcmpeqq {{\.?LCPI[0-9]+_[0-9]+}}(%rip){1to4}, %ymm0, %k1
 ; AVX512-NEXT:    vpcmpeqd %xmm0, %xmm0, %xmm0
 ; AVX512-NEXT:    vmovdqa32 %xmm0, %xmm0 {%k1} {z}
 ; AVX512-NEXT:    vzeroupper
 ; AVX512-NEXT:    retq
 ;
 ; AVX2-LABEL: illegal_abs_to_eq_or:
 ; AVX2:       # %bb.0:
-; AVX2-NEXT:    vpxor %xmm1, %xmm1, %xmm1
-; AVX2-NEXT:    vpsubq %ymm0, %ymm1, %ymm1
-; AVX2-NEXT:    vblendvpd %ymm0, %ymm1, %ymm0, %ymm0
 ; AVX2-NEXT:    vpbroadcastq {{.*#+}} ymm1 = [129,129,129,129]
+; AVX2-NEXT:    vpbroadcastq {{.*#+}} ymm2 = [18446744073709551487,18446744073709551487,18446744073709551487,18446744073709551487]
+; AVX2-NEXT:    vpcmpeqq %ymm2, %ymm0, %ymm2
 ; AVX2-NEXT:    vpcmpeqq %ymm1, %ymm0, %ymm0
+; AVX2-NEXT:    vpor %ymm2, %ymm0, %ymm0
 ; AVX2-NEXT:    vextracti128 $1, %ymm0, %xmm1
 ; AVX2-NEXT:    vpackssdw %xmm1, %xmm0, %xmm0
 ; AVX2-NEXT:    vzeroupper
 ; AVX2-NEXT:    retq
 ;
 ; SSE41-LABEL: illegal_abs_to_eq_or:
 ; SSE41:       # %bb.0:
-; SSE41-NEXT:    movdqa %xmm0, %xmm2
-; SSE41-NEXT:    pxor %xmm3, %xmm3
-; SSE41-NEXT:    pxor %xmm4, %xmm4
-; SSE41-NEXT:    psubq %xmm0, %xmm4
-; SSE41-NEXT:    blendvpd %xmm0, %xmm4, %xmm2
-; SSE41-NEXT:    psubq %xmm1, %xmm3
-; SSE41-NEXT:    movdqa %xmm1, %xmm0
-; SSE41-NEXT:    blendvpd %xmm0, %xmm3, %xmm1
-; SSE41-NEXT:    movdqa {{.*#+}} xmm0 = [129,129]
-; SSE41-NEXT:    pcmpeqq %xmm0, %xmm1
-; SSE41-NEXT:    pcmpeqq %xmm0, %xmm2
-; SSE41-NEXT:    packssdw %xmm1, %xmm2
-; SSE41-NEXT:    movdqa %xmm2, %xmm0
+; SSE41-NEXT:    movdqa {{.*#+}} xmm2 = [129,129]
+; SSE41-NEXT:    movdqa {{.*#+}} xmm3 = [18446744073709551487,18446744073709551487]
+; SSE41-NEXT:    movdqa %xmm1, %xmm4
+; SSE41-NEXT:    pcmpeqq %xmm3, %xmm4
+; SSE41-NEXT:    pcmpeqq %xmm2, %xmm1
+; SSE41-NEXT:    por %xmm4, %xmm1
+; SSE41-NEXT:    pcmpeqq %xmm0, %xmm3
+; SSE41-NEXT:    pcmpeqq %xmm2, %xmm0
+; SSE41-NEXT:    por %xmm3, %xmm0
+; SSE41-NEXT:    packssdw %xmm1, %xmm0
 ; SSE41-NEXT:    retq
 ;
 ; SSE2-LABEL: illegal_abs_to_eq_or:
 ; SSE2:       # %bb.0:
 ; SSE2-NEXT:    movdqa %xmm0, %xmm2
 ; SSE2-NEXT:    psrad $31, %xmm2
 ; SSE2-NEXT:    pshufd {{.*#+}} xmm2 = xmm2[1,1,3,3]
 ; SSE2-NEXT:    pxor %xmm2, %xmm0

 ; AVX512:       # %bb.0:
 ; AVX512-NEXT:    vpabsq %ymm0, %ymm0
 ; AVX512-NEXT:    vpbroadcastq {{.*#+}} ymm1 = [129,129,129,129]
 ; AVX512-NEXT:    vpcmpeqq %ymm1, %ymm0, %ymm0
 ; AVX512-NEXT:    retq
 ;
 ; AVX2-LABEL: illegal_abs_to_eq_or_sext:
 ; AVX2:       # %bb.0:
-; AVX2-NEXT:    vpxor %xmm1, %xmm1, %xmm1
-; AVX2-NEXT:    vpsubq %ymm0, %ymm1, %ymm1
-; AVX2-NEXT:    vblendvpd %ymm0, %ymm1, %ymm0, %ymm0
 ; AVX2-NEXT:    vpbroadcastq {{.*#+}} ymm1 = [129,129,129,129]
+; AVX2-NEXT:    vpbroadcastq {{.*#+}} ymm2 = [18446744073709551487,18446744073709551487,18446744073709551487,18446744073709551487]
+; AVX2-NEXT:    vpcmpeqq %ymm2, %ymm0, %ymm2
 ; AVX2-NEXT:    vpcmpeqq %ymm1, %ymm0, %ymm0
+; AVX2-NEXT:    vpor %ymm2, %ymm0, %ymm0
 ; AVX2-NEXT:    retq
 ;
 ; SSE41-LABEL: illegal_abs_to_eq_or_sext:
 ; SSE41:       # %bb.0:
-; SSE41-NEXT:    movdqa %xmm0, %xmm2
-; SSE41-NEXT:    pxor %xmm3, %xmm3
-; SSE41-NEXT:    pxor %xmm4, %xmm4
-; SSE41-NEXT:    psubq %xmm1, %xmm4
-; SSE41-NEXT:    movdqa %xmm1, %xmm0
-; SSE41-NEXT:    blendvpd %xmm0, %xmm4, %xmm1
-; SSE41-NEXT:    psubq %xmm2, %xmm3
-; SSE41-NEXT:    movdqa %xmm2, %xmm0
-; SSE41-NEXT:    blendvpd %xmm0, %xmm3, %xmm2
-; SSE41-NEXT:    movdqa {{.*#+}} xmm0 = [129,129]
-; SSE41-NEXT:    pcmpeqq %xmm0, %xmm2
-; SSE41-NEXT:    pcmpeqq %xmm0, %xmm1
-; SSE41-NEXT:    movdqa %xmm2, %xmm0
+; SSE41-NEXT:    movdqa {{.*#+}} xmm2 = [129,129]
+; SSE41-NEXT:    movdqa {{.*#+}} xmm3 = [18446744073709551487,18446744073709551487]
+; SSE41-NEXT:    movdqa %xmm0, %xmm4
+; SSE41-NEXT:    pcmpeqq %xmm3, %xmm4
+; SSE41-NEXT:    pcmpeqq %xmm2, %xmm0
+; SSE41-NEXT:    por %xmm4, %xmm0
+; SSE41-NEXT:    pcmpeqq %xmm1, %xmm3
+; SSE41-NEXT:    pcmpeqq %xmm2, %xmm1
+; SSE41-NEXT:    por %xmm3, %xmm1
 ; SSE41-NEXT:    retq
 ;
 ; SSE2-LABEL: illegal_abs_to_eq_or_sext:
 ; SSE2:       # %bb.0:
 ; SSE2-NEXT:    movdqa %xmm1, %xmm2
 ; SSE2-NEXT:    psrad $31, %xmm2
 ; SSE2-NEXT:    pshufd {{.*#+}} xmm2 = xmm2[1,1,3,3]
 ; SSE2-NEXT:    pxor %xmm2, %xmm1

 ; AVX512-NEXT:    vpcmpneqq {{\.?LCPI[0-9]+_[0-9]+}}(%rip){1to4}, %ymm0, %k1
 ; AVX512-NEXT:    vpcmpeqd %xmm0, %xmm0, %xmm0
 ; AVX512-NEXT:    vmovdqa32 %xmm0, %xmm0 {%k1} {z}
 ; AVX512-NEXT:    vzeroupper
 ; AVX512-NEXT:    retq
 ;
 ; AVX2-LABEL: illegal_abs_to_ne_and:
 ; AVX2:       # %bb.0:
-; AVX2-NEXT:    vpxor %xmm1, %xmm1, %xmm1
-; AVX2-NEXT:    vpsubq %ymm0, %ymm1, %ymm1
-; AVX2-NEXT:    vblendvpd %ymm0, %ymm1, %ymm0, %ymm0
 ; AVX2-NEXT:    vpbroadcastq {{.*#+}} ymm1 = [129,129,129,129]
-; AVX2-NEXT:    vpcmpeqq %ymm1, %ymm0, %ymm0
-; AVX2-NEXT:    vpcmpeqd %ymm1, %ymm1, %ymm1
-; AVX2-NEXT:    vpxor %ymm1, %ymm0, %ymm0
+; AVX2-NEXT:    vpcmpeqq %ymm1, %ymm0, %ymm1
+; AVX2-NEXT:    vpbroadcastq {{.*#+}} ymm2 = [18446744073709551487,18446744073709551487,18446744073709551487,18446744073709551487]
+; AVX2-NEXT:    vpcmpeqq %ymm2, %ymm0, %ymm0
+; AVX2-NEXT:    vpcmpeqd %ymm2, %ymm2, %ymm2
+; AVX2-NEXT:    vpxor %ymm2, %ymm0, %ymm0
+; AVX2-NEXT:    vpandn %ymm0, %ymm1, %ymm0
 ; AVX2-NEXT:    vextracti128 $1, %ymm0, %xmm1
 ; AVX2-NEXT:    vpackssdw %xmm1, %xmm0, %xmm0
 ; AVX2-NEXT:    vzeroupper
 ; AVX2-NEXT:    retq
 ;
 ; SSE41-LABEL: illegal_abs_to_ne_and:
 ; SSE41:       # %bb.0:
-; SSE41-NEXT:    movdqa %xmm0, %xmm2
-; SSE41-NEXT:    pxor %xmm3, %xmm3
-; SSE41-NEXT:    pxor %xmm4, %xmm4
-; SSE41-NEXT:    psubq %xmm0, %xmm4
-; SSE41-NEXT:    blendvpd %xmm0, %xmm4, %xmm2
-; SSE41-NEXT:    psubq %xmm1, %xmm3
-; SSE41-NEXT:    movdqa %xmm1, %xmm0
-; SSE41-NEXT:    blendvpd %xmm0, %xmm3, %xmm1
-; SSE41-NEXT:    movdqa {{.*#+}} xmm0 = [129,129]
-; SSE41-NEXT:    pcmpeqq %xmm0, %xmm1
-; SSE41-NEXT:    pcmpeqd %xmm3, %xmm3
-; SSE41-NEXT:    pxor %xmm3, %xmm1
+; SSE41-NEXT:    movdqa {{.*#+}} xmm2 = [129,129]
+; SSE41-NEXT:    movdqa %xmm1, %xmm3
+; SSE41-NEXT:    pcmpeqq %xmm2, %xmm3
+; SSE41-NEXT:    movdqa {{.*#+}} xmm4 = [18446744073709551487,18446744073709551487]
+; SSE41-NEXT:    pcmpeqq %xmm4, %xmm1
+; SSE41-NEXT:    pcmpeqd %xmm5, %xmm5
+; SSE41-NEXT:    pxor %xmm5, %xmm1
+; SSE41-NEXT:    pandn %xmm1, %xmm3
 ; SSE41-NEXT:    pcmpeqq %xmm0, %xmm2
-; SSE41-NEXT:    pxor %xmm3, %xmm2
-; SSE41-NEXT:    packssdw %xmm1, %xmm2
+; SSE41-NEXT:    pcmpeqq %xmm4, %xmm0
+; SSE41-NEXT:    pxor %xmm5, %xmm0
+; SSE41-NEXT:    pandn %xmm0, %xmm2
+; SSE41-NEXT:    packssdw %xmm3, %xmm2
 ; SSE41-NEXT:    movdqa %xmm2, %xmm0
 ; SSE41-NEXT:    retq
 ;
 ; SSE2-LABEL: illegal_abs_to_ne_and:
 ; SSE2:       # %bb.0:
 ; SSE2-NEXT:    movdqa %xmm0, %xmm2
 ; SSE2-NEXT:    psrad $31, %xmm2
 ; SSE2-NEXT:    pshufd {{.*#+}} xmm2 = xmm2[1,1,3,3]

 ; AVX512-NEXT:    vpabsq %ymm0, %ymm0
 ; AVX512-NEXT:    vpbroadcastq {{.*#+}} ymm1 = [129,129,129,129]
 ; AVX512-NEXT:    vpcmpeqq %ymm1, %ymm0, %ymm0
 ; AVX512-NEXT:    vpternlogq $15, %ymm0, %ymm0, %ymm0
 ; AVX512-NEXT:    retq
 ;
 ; AVX2-LABEL: illegal_abs_to_ne_and_sext:
 ; AVX2:       # %bb.0:
-; AVX2-NEXT:    vpxor %xmm1, %xmm1, %xmm1
-; AVX2-NEXT:    vpsubq %ymm0, %ymm1, %ymm1
-; AVX2-NEXT:    vblendvpd %ymm0, %ymm1, %ymm0, %ymm0
 ; AVX2-NEXT:    vpbroadcastq {{.*#+}} ymm1 = [129,129,129,129]
-; AVX2-NEXT:    vpcmpeqq %ymm1, %ymm0, %ymm0
-; AVX2-NEXT:    vpcmpeqd %ymm1, %ymm1, %ymm1
-; AVX2-NEXT:    vpxor %ymm1, %ymm0, %ymm0
+; AVX2-NEXT:    vpcmpeqq %ymm1, %ymm0, %ymm1
+; AVX2-NEXT:    vpbroadcastq {{.*#+}} ymm2 = [18446744073709551487,18446744073709551487,18446744073709551487,18446744073709551487]
+; AVX2-NEXT:    vpcmpeqq %ymm2, %ymm0, %ymm0
+; AVX2-NEXT:    vpcmpeqd %ymm2, %ymm2, %ymm2
+; AVX2-NEXT:    vpxor %ymm2, %ymm0, %ymm0
+; AVX2-NEXT:    vpandn %ymm0, %ymm1, %ymm0
 ; AVX2-NEXT:    retq
 ;
 ; SSE41-LABEL: illegal_abs_to_ne_and_sext:
 ; SSE41:       # %bb.0:
-; SSE41-NEXT:    movdqa %xmm0, %xmm2
-; SSE41-NEXT:    pxor %xmm3, %xmm3
-; SSE41-NEXT:    pxor %xmm4, %xmm4
-; SSE41-NEXT:    psubq %xmm1, %xmm4
-; SSE41-NEXT:    movdqa %xmm1, %xmm0
-; SSE41-NEXT:    blendvpd %xmm0, %xmm4, %xmm1
-; SSE41-NEXT:    psubq %xmm2, %xmm3
-; SSE41-NEXT:    movdqa %xmm2, %xmm0
-; SSE41-NEXT:    blendvpd %xmm0, %xmm3, %xmm2
-; SSE41-NEXT:    movdqa {{.*#+}} xmm0 = [129,129]
-; SSE41-NEXT:    pcmpeqq %xmm0, %xmm2
-; SSE41-NEXT:    pcmpeqd %xmm3, %xmm3
-; SSE41-NEXT:    pxor %xmm3, %xmm2
-; SSE41-NEXT:    pcmpeqq %xmm0, %xmm1
-; SSE41-NEXT:    pxor %xmm3, %xmm1
-; SSE41-NEXT:    movdqa %xmm2, %xmm0
+; SSE41-NEXT:    movdqa {{.*#+}} xmm2 = [129,129]
+; SSE41-NEXT:    movdqa %xmm0, %xmm3
+; SSE41-NEXT:    pcmpeqq %xmm2, %xmm3
+; SSE41-NEXT:    movdqa {{.*#+}} xmm4 = [18446744073709551487,18446744073709551487]
+; SSE41-NEXT:    pcmpeqq %xmm4, %xmm0
+; SSE41-NEXT:    pcmpeqd %xmm5, %xmm5
+; SSE41-NEXT:    pxor %xmm5, %xmm0
+; SSE41-NEXT:    pandn %xmm0, %xmm3
+; SSE41-NEXT:    pcmpeqq %xmm1, %xmm2
+; SSE41-NEXT:    pcmpeqq %xmm4, %xmm1
+; SSE41-NEXT:    pxor %xmm5, %xmm1
+; SSE41-NEXT:    pandn %xmm1, %xmm2
+; SSE41-NEXT:    movdqa %xmm3, %xmm0
+; SSE41-NEXT:    movdqa %xmm2, %xmm1
 ; SSE41-NEXT:    retq
 ;
 ; SSE2-LABEL: illegal_abs_to_ne_and_sext:
 ; SSE2:       # %bb.0:
 ; SSE2-NEXT:    movdqa %xmm1, %xmm2
 ; SSE2-NEXT:    psrad $31, %xmm2
 ; SSE2-NEXT:    pshufd {{.*#+}} xmm2 = xmm2[1,1,3,3]
 ; SSE2-NEXT:    pxor %xmm2, %xmm1