[X86] Freeze vXi8 shl(x,1) -> add(x,x) vector fold (PR50468)

We don't have any vXi8 shift instructions (other than on XOP which is handled separately), so replace the shl(x,1) -> add(x,x) fold with shl(x,1) -> add(freeze(x),freeze(x)) to avoid the undef issues identified in PR50468.

Split off from D106675 as I'm still looking at whether we can fix the vXi16/i32/i64 issues with the D106679 alternative.

Differential Revision: https://reviews.llvm.org/D108139

Author: RKSimon

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -28731,8 +28731,15 @@ static SDValue LowerScalarImmediateShift(SDValue Op, SelectionDAG &DAG,
     MVT ShiftVT = MVT::getVectorVT(MVT::i16, NumElts / 2);
 
     // Simple i8 add case
-    if (Op.getOpcode() == ISD::SHL && ShiftAmt == 1)
+    if (Op.getOpcode() == ISD::SHL && ShiftAmt == 1) {
+      // R may be undef at run-time, but (shl R, 1) must be an even number (LSB
+      // must be 0). (add undef, undef) however can be any value. To make this
+      // safe, we must freeze R to ensure that register allocation uses the same
+      // register for an undefined value. This ensures that the result will
+      // still be even and preserves the original semantics.
+      R = DAG.getNode(ISD::FREEZE, dl, VT, R);
       return DAG.getNode(ISD::ADD, dl, VT, R, R);
+    }
 
     // ashr(R, 7)  === cmp_slt(R, 0)
     if (Op.getOpcode() == ISD::SRA && ShiftAmt == 7) {

llvm/test/CodeGen/X86/bitreverse.ll

@@ -69,11 +69,11 @@ define <2 x i16> @test_bitreverse_v2i16(<2 x i16> %a) nounwind {
 ; X64-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
 ; X64-NEXT:    psrlw $2, %xmm0
 ; X64-NEXT:    por %xmm1, %xmm0
-; X64-NEXT:    movdqa {{.*#+}} xmm1 = [85,85,85,85,85,85,85,85,85,85,85,85,85,85,85,85]
+; X64-NEXT:    movdqa {{.*#+}} xmm1 = [170,170,170,170,170,170,170,170,170,170,170,170,170,170,170,170]
 ; X64-NEXT:    pand %xmm0, %xmm1
-; X64-NEXT:    paddb %xmm1, %xmm1
+; X64-NEXT:    psrlw $1, %xmm1
 ; X64-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
-; X64-NEXT:    psrlw $1, %xmm0
+; X64-NEXT:    paddb %xmm0, %xmm0
 ; X64-NEXT:    por %xmm1, %xmm0
 ; X64-NEXT:    retq
 ;

llvm/test/CodeGen/X86/combine-bitreverse.ll

@@ -61,11 +61,11 @@ define <4 x i32> @test_demandedbits_bitreverse(<4 x i32> %a0) nounwind {
 ; X86-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}, %xmm0
 ; X86-NEXT:    psrlw $2, %xmm0
 ; X86-NEXT:    por %xmm1, %xmm0
-; X86-NEXT:    movdqa {{.*#+}} xmm1 = [85,85,85,85,85,85,85,85,85,85,85,85,85,85,85,85]
+; X86-NEXT:    movdqa {{.*#+}} xmm1 = [170,170,170,170,170,170,170,170,170,170,170,170,170,170,170,170]
 ; X86-NEXT:    pand %xmm0, %xmm1
-; X86-NEXT:    paddb %xmm1, %xmm1
+; X86-NEXT:    psrlw $1, %xmm1
 ; X86-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}, %xmm0
-; X86-NEXT:    psrlw $1, %xmm0
+; X86-NEXT:    paddb %xmm0, %xmm0
 ; X86-NEXT:    por %xmm1, %xmm0
 ; X86-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}, %xmm0
 ; X86-NEXT:    retl

llvm/test/CodeGen/X86/vector-bitreverse.ll

@@ -517,10 +517,10 @@ define <16 x i8> @var_funnnel_v16i8(<16 x i8> %x, <16 x i8> %amt) nounwind {
 ; SSE2-NEXT:    pandn %xmm3, %xmm2
 ; SSE2-NEXT:    por %xmm4, %xmm2
 ; SSE2-NEXT:    movdqa %xmm2, %xmm3
-; SSE2-NEXT:    paddb %xmm2, %xmm3
+; SSE2-NEXT:    psrlw $7, %xmm3
+; SSE2-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm3
 ; SSE2-NEXT:    movdqa %xmm2, %xmm4
-; SSE2-NEXT:    psrlw $7, %xmm4
-; SSE2-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm4
+; SSE2-NEXT:    paddb %xmm2, %xmm4
 ; SSE2-NEXT:    por %xmm3, %xmm4
 ; SSE2-NEXT:    paddb %xmm1, %xmm1
 ; SSE2-NEXT:    pcmpgtb %xmm1, %xmm0
@@ -553,10 +553,10 @@ define <16 x i8> @var_funnnel_v16i8(<16 x i8> %x, <16 x i8> %amt) nounwind {
 ; SSE41-NEXT:    movdqa %xmm2, %xmm0
 ; SSE41-NEXT:    pblendvb %xmm0, %xmm3, %xmm1
 ; SSE41-NEXT:    movdqa %xmm1, %xmm0
-; SSE41-NEXT:    paddb %xmm1, %xmm0
+; SSE41-NEXT:    psrlw $7, %xmm0
+; SSE41-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
 ; SSE41-NEXT:    movdqa %xmm1, %xmm3
-; SSE41-NEXT:    psrlw $7, %xmm3
-; SSE41-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm3
+; SSE41-NEXT:    paddb %xmm1, %xmm3
 ; SSE41-NEXT:    por %xmm0, %xmm3
 ; SSE41-NEXT:    paddb %xmm2, %xmm2
 ; SSE41-NEXT:    movdqa %xmm2, %xmm0
@@ -580,10 +580,10 @@ define <16 x i8> @var_funnnel_v16i8(<16 x i8> %x, <16 x i8> %amt) nounwind {
 ; AVX-NEXT:    vpor %xmm2, %xmm3, %xmm2
 ; AVX-NEXT:    vpaddb %xmm1, %xmm1, %xmm1
 ; AVX-NEXT:    vpblendvb %xmm1, %xmm2, %xmm0, %xmm0
-; AVX-NEXT:    vpaddb %xmm0, %xmm0, %xmm2
-; AVX-NEXT:    vpsrlw $7, %xmm0, %xmm3
-; AVX-NEXT:    vpand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm3, %xmm3
-; AVX-NEXT:    vpor %xmm3, %xmm2, %xmm2
+; AVX-NEXT:    vpsrlw $7, %xmm0, %xmm2
+; AVX-NEXT:    vpand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm2, %xmm2
+; AVX-NEXT:    vpaddb %xmm0, %xmm0, %xmm3
+; AVX-NEXT:    vpor %xmm2, %xmm3, %xmm2
 ; AVX-NEXT:    vpaddb %xmm1, %xmm1, %xmm1
 ; AVX-NEXT:    vpblendvb %xmm1, %xmm2, %xmm0, %xmm0
 ; AVX-NEXT:    retq
@@ -728,10 +728,10 @@ define <16 x i8> @var_funnnel_v16i8(<16 x i8> %x, <16 x i8> %amt) nounwind {
 ; X86-SSE2-NEXT:    pandn %xmm3, %xmm2
 ; X86-SSE2-NEXT:    por %xmm4, %xmm2
 ; X86-SSE2-NEXT:    movdqa %xmm2, %xmm3
-; X86-SSE2-NEXT:    paddb %xmm2, %xmm3
+; X86-SSE2-NEXT:    psrlw $7, %xmm3
+; X86-SSE2-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}, %xmm3
 ; X86-SSE2-NEXT:    movdqa %xmm2, %xmm4
-; X86-SSE2-NEXT:    psrlw $7, %xmm4
-; X86-SSE2-NEXT:    pand {{\.?LCPI[0-9]+_[0-9]+}}, %xmm4
+; X86-SSE2-NEXT:    paddb %xmm2, %xmm4
 ; X86-SSE2-NEXT:    por %xmm3, %xmm4
 ; X86-SSE2-NEXT:    paddb %xmm1, %xmm1
 ; X86-SSE2-NEXT:    pcmpgtb %xmm1, %xmm0

llvm/test/CodeGen/X86/vector-fshl-rot-128.ll

@@ -443,10 +443,10 @@ define <32 x i8> @var_funnnel_v32i8(<32 x i8> %x, <32 x i8> %amt) nounwind {
 ; AVX2-NEXT:    vpor %ymm2, %ymm3, %ymm2
 ; AVX2-NEXT:    vpaddb %ymm1, %ymm1, %ymm1
 ; AVX2-NEXT:    vpblendvb %ymm1, %ymm2, %ymm0, %ymm0
-; AVX2-NEXT:    vpaddb %ymm0, %ymm0, %ymm2
-; AVX2-NEXT:    vpsrlw $7, %ymm0, %ymm3
-; AVX2-NEXT:    vpand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %ymm3, %ymm3
-; AVX2-NEXT:    vpor %ymm3, %ymm2, %ymm2
+; AVX2-NEXT:    vpsrlw $7, %ymm0, %ymm2
+; AVX2-NEXT:    vpand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %ymm2, %ymm2
+; AVX2-NEXT:    vpaddb %ymm0, %ymm0, %ymm3
+; AVX2-NEXT:    vpor %ymm2, %ymm3, %ymm2
 ; AVX2-NEXT:    vpaddb %ymm1, %ymm1, %ymm1
 ; AVX2-NEXT:    vpblendvb %ymm1, %ymm2, %ymm0, %ymm0
 ; AVX2-NEXT:    retq
@@ -467,10 +467,10 @@ define <32 x i8> @var_funnnel_v32i8(<32 x i8> %x, <32 x i8> %amt) nounwind {
 ; AVX512F-NEXT:    vpor %ymm2, %ymm3, %ymm2
 ; AVX512F-NEXT:    vpaddb %ymm1, %ymm1, %ymm1
 ; AVX512F-NEXT:    vpblendvb %ymm1, %ymm2, %ymm0, %ymm0
-; AVX512F-NEXT:    vpaddb %ymm0, %ymm0, %ymm2
-; AVX512F-NEXT:    vpsrlw $7, %ymm0, %ymm3
-; AVX512F-NEXT:    vpand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %ymm3, %ymm3
-; AVX512F-NEXT:    vpor %ymm3, %ymm2, %ymm2
+; AVX512F-NEXT:    vpsrlw $7, %ymm0, %ymm2
+; AVX512F-NEXT:    vpand {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %ymm2, %ymm2
+; AVX512F-NEXT:    vpaddb %ymm0, %ymm0, %ymm3
+; AVX512F-NEXT:    vpor %ymm2, %ymm3, %ymm2
 ; AVX512F-NEXT:    vpaddb %ymm1, %ymm1, %ymm1
 ; AVX512F-NEXT:    vpblendvb %ymm1, %ymm2, %ymm0, %ymm0
 ; AVX512F-NEXT:    retq

llvm/test/CodeGen/X86/vector-fshl-rot-256.ll

@@ -272,154 +272,154 @@ define <64 x i8> @var_funnnel_v64i8(<64 x i8> %x, <64 x i8> %amt) nounwind {
 ;
 ; AVX512BW-LABEL: var_funnnel_v64i8:
 ; AVX512BW:       # %bb.0:
-; AVX512BW-NEXT:    vpxor %xmm2, %xmm2, %xmm2
-; AVX512BW-NEXT:    vpsubb %zmm1, %zmm2, %zmm2
-; AVX512BW-NEXT:    vmovdqa64 {{.*#+}} zmm3 = [7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7]
-; AVX512BW-NEXT:    vpandq %zmm3, %zmm2, %zmm2
-; AVX512BW-NEXT:    vpsllw $5, %zmm2, %zmm2
-; AVX512BW-NEXT:    vpaddb %zmm2, %zmm2, %zmm4
+; AVX512BW-NEXT:    vmovdqa64 {{.*#+}} zmm2 = [7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7]
+; AVX512BW-NEXT:    vpandq %zmm2, %zmm1, %zmm3
+; AVX512BW-NEXT:    vpsllw $5, %zmm3, %zmm3
+; AVX512BW-NEXT:    vpaddb %zmm3, %zmm3, %zmm4
 ; AVX512BW-NEXT:    vpmovb2m %zmm4, %k1
-; AVX512BW-NEXT:    vpmovb2m %zmm2, %k2
-; AVX512BW-NEXT:    vpsrlw $4, %zmm0, %zmm2
-; AVX512BW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm2, %zmm2
-; AVX512BW-NEXT:    vpblendmb %zmm2, %zmm0, %zmm2 {%k2}
-; AVX512BW-NEXT:    vpsrlw $2, %zmm2, %zmm5
-; AVX512BW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm5, %zmm5
-; AVX512BW-NEXT:    vmovdqu8 %zmm5, %zmm2 {%k1}
-; AVX512BW-NEXT:    vpsrlw $1, %zmm2, %zmm5
+; AVX512BW-NEXT:    vpmovb2m %zmm3, %k2
+; AVX512BW-NEXT:    vpsllw $4, %zmm0, %zmm3
+; AVX512BW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm3, %zmm3
+; AVX512BW-NEXT:    vpblendmb %zmm3, %zmm0, %zmm3 {%k2}
+; AVX512BW-NEXT:    vpsllw $2, %zmm3, %zmm5
 ; AVX512BW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm5, %zmm5
+; AVX512BW-NEXT:    vmovdqu8 %zmm5, %zmm3 {%k1}
 ; AVX512BW-NEXT:    vpaddb %zmm4, %zmm4, %zmm4
 ; AVX512BW-NEXT:    vpmovb2m %zmm4, %k1
-; AVX512BW-NEXT:    vmovdqu8 %zmm5, %zmm2 {%k1}
-; AVX512BW-NEXT:    vpandq %zmm3, %zmm1, %zmm1
+; AVX512BW-NEXT:    vpaddb %zmm3, %zmm3, %zmm3 {%k1}
+; AVX512BW-NEXT:    vpxor %xmm4, %xmm4, %xmm4
+; AVX512BW-NEXT:    vpsubb %zmm1, %zmm4, %zmm1
+; AVX512BW-NEXT:    vpandq %zmm2, %zmm1, %zmm1
 ; AVX512BW-NEXT:    vpsllw $5, %zmm1, %zmm1
-; AVX512BW-NEXT:    vpaddb %zmm1, %zmm1, %zmm3
-; AVX512BW-NEXT:    vpmovb2m %zmm3, %k1
+; AVX512BW-NEXT:    vpaddb %zmm1, %zmm1, %zmm2
+; AVX512BW-NEXT:    vpmovb2m %zmm2, %k1
 ; AVX512BW-NEXT:    vpmovb2m %zmm1, %k2
-; AVX512BW-NEXT:    vpsllw $4, %zmm0, %zmm1
+; AVX512BW-NEXT:    vpsrlw $4, %zmm0, %zmm1
 ; AVX512BW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
 ; AVX512BW-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k2}
-; AVX512BW-NEXT:    vpsllw $2, %zmm0, %zmm1
+; AVX512BW-NEXT:    vpsrlw $2, %zmm0, %zmm1
 ; AVX512BW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
 ; AVX512BW-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k1}
-; AVX512BW-NEXT:    vpaddb %zmm3, %zmm3, %zmm1
-; AVX512BW-NEXT:    vpmovb2m %zmm1, %k1
-; AVX512BW-NEXT:    vpaddb %zmm0, %zmm0, %zmm0 {%k1}
-; AVX512BW-NEXT:    vporq %zmm2, %zmm0, %zmm0
+; AVX512BW-NEXT:    vpsrlw $1, %zmm0, %zmm1
+; AVX512BW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
+; AVX512BW-NEXT:    vpaddb %zmm2, %zmm2, %zmm2
+; AVX512BW-NEXT:    vpmovb2m %zmm2, %k1
+; AVX512BW-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k1}
+; AVX512BW-NEXT:    vporq %zmm0, %zmm3, %zmm0
 ; AVX512BW-NEXT:    retq
 ;
 ; AVX512VLBW-LABEL: var_funnnel_v64i8:
 ; AVX512VLBW:       # %bb.0:
-; AVX512VLBW-NEXT:    vpxor %xmm2, %xmm2, %xmm2
-; AVX512VLBW-NEXT:    vpsubb %zmm1, %zmm2, %zmm2
-; AVX512VLBW-NEXT:    vmovdqa64 {{.*#+}} zmm3 = [7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7]
-; AVX512VLBW-NEXT:    vpandq %zmm3, %zmm2, %zmm2
-; AVX512VLBW-NEXT:    vpsllw $5, %zmm2, %zmm2
-; AVX512VLBW-NEXT:    vpaddb %zmm2, %zmm2, %zmm4
+; AVX512VLBW-NEXT:    vmovdqa64 {{.*#+}} zmm2 = [7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7]
+; AVX512VLBW-NEXT:    vpandq %zmm2, %zmm1, %zmm3
+; AVX512VLBW-NEXT:    vpsllw $5, %zmm3, %zmm3
+; AVX512VLBW-NEXT:    vpaddb %zmm3, %zmm3, %zmm4
 ; AVX512VLBW-NEXT:    vpmovb2m %zmm4, %k1
-; AVX512VLBW-NEXT:    vpmovb2m %zmm2, %k2
-; AVX512VLBW-NEXT:    vpsrlw $4, %zmm0, %zmm2
-; AVX512VLBW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm2, %zmm2
-; AVX512VLBW-NEXT:    vpblendmb %zmm2, %zmm0, %zmm2 {%k2}
-; AVX512VLBW-NEXT:    vpsrlw $2, %zmm2, %zmm5
-; AVX512VLBW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm5, %zmm5
-; AVX512VLBW-NEXT:    vmovdqu8 %zmm5, %zmm2 {%k1}
-; AVX512VLBW-NEXT:    vpsrlw $1, %zmm2, %zmm5
+; AVX512VLBW-NEXT:    vpmovb2m %zmm3, %k2
+; AVX512VLBW-NEXT:    vpsllw $4, %zmm0, %zmm3
+; AVX512VLBW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm3, %zmm3
+; AVX512VLBW-NEXT:    vpblendmb %zmm3, %zmm0, %zmm3 {%k2}
+; AVX512VLBW-NEXT:    vpsllw $2, %zmm3, %zmm5
 ; AVX512VLBW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm5, %zmm5
+; AVX512VLBW-NEXT:    vmovdqu8 %zmm5, %zmm3 {%k1}
 ; AVX512VLBW-NEXT:    vpaddb %zmm4, %zmm4, %zmm4
 ; AVX512VLBW-NEXT:    vpmovb2m %zmm4, %k1
-; AVX512VLBW-NEXT:    vmovdqu8 %zmm5, %zmm2 {%k1}
-; AVX512VLBW-NEXT:    vpandq %zmm3, %zmm1, %zmm1
+; AVX512VLBW-NEXT:    vpaddb %zmm3, %zmm3, %zmm3 {%k1}
+; AVX512VLBW-NEXT:    vpxor %xmm4, %xmm4, %xmm4
+; AVX512VLBW-NEXT:    vpsubb %zmm1, %zmm4, %zmm1
+; AVX512VLBW-NEXT:    vpandq %zmm2, %zmm1, %zmm1
 ; AVX512VLBW-NEXT:    vpsllw $5, %zmm1, %zmm1
-; AVX512VLBW-NEXT:    vpaddb %zmm1, %zmm1, %zmm3
-; AVX512VLBW-NEXT:    vpmovb2m %zmm3, %k1
+; AVX512VLBW-NEXT:    vpaddb %zmm1, %zmm1, %zmm2
+; AVX512VLBW-NEXT:    vpmovb2m %zmm2, %k1
 ; AVX512VLBW-NEXT:    vpmovb2m %zmm1, %k2
-; AVX512VLBW-NEXT:    vpsllw $4, %zmm0, %zmm1
+; AVX512VLBW-NEXT:    vpsrlw $4, %zmm0, %zmm1
 ; AVX512VLBW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
 ; AVX512VLBW-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k2}
-; AVX512VLBW-NEXT:    vpsllw $2, %zmm0, %zmm1
+; AVX512VLBW-NEXT:    vpsrlw $2, %zmm0, %zmm1
 ; AVX512VLBW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
 ; AVX512VLBW-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k1}
-; AVX512VLBW-NEXT:    vpaddb %zmm3, %zmm3, %zmm1
-; AVX512VLBW-NEXT:    vpmovb2m %zmm1, %k1
-; AVX512VLBW-NEXT:    vpaddb %zmm0, %zmm0, %zmm0 {%k1}
-; AVX512VLBW-NEXT:    vporq %zmm2, %zmm0, %zmm0
+; AVX512VLBW-NEXT:    vpsrlw $1, %zmm0, %zmm1
+; AVX512VLBW-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
+; AVX512VLBW-NEXT:    vpaddb %zmm2, %zmm2, %zmm2
+; AVX512VLBW-NEXT:    vpmovb2m %zmm2, %k1
+; AVX512VLBW-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k1}
+; AVX512VLBW-NEXT:    vporq %zmm0, %zmm3, %zmm0
 ; AVX512VLBW-NEXT:    retq
 ;
 ; AVX512VBMI2-LABEL: var_funnnel_v64i8:
 ; AVX512VBMI2:       # %bb.0:
-; AVX512VBMI2-NEXT:    vpxor %xmm2, %xmm2, %xmm2
-; AVX512VBMI2-NEXT:    vpsubb %zmm1, %zmm2, %zmm2
-; AVX512VBMI2-NEXT:    vmovdqa64 {{.*#+}} zmm3 = [7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7]
-; AVX512VBMI2-NEXT:    vpandq %zmm3, %zmm2, %zmm2
-; AVX512VBMI2-NEXT:    vpsllw $5, %zmm2, %zmm2
-; AVX512VBMI2-NEXT:    vpaddb %zmm2, %zmm2, %zmm4
+; AVX512VBMI2-NEXT:    vmovdqa64 {{.*#+}} zmm2 = [7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7]
+; AVX512VBMI2-NEXT:    vpandq %zmm2, %zmm1, %zmm3
+; AVX512VBMI2-NEXT:    vpsllw $5, %zmm3, %zmm3
+; AVX512VBMI2-NEXT:    vpaddb %zmm3, %zmm3, %zmm4
 ; AVX512VBMI2-NEXT:    vpmovb2m %zmm4, %k1
-; AVX512VBMI2-NEXT:    vpmovb2m %zmm2, %k2
-; AVX512VBMI2-NEXT:    vpsrlw $4, %zmm0, %zmm2
-; AVX512VBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm2, %zmm2
-; AVX512VBMI2-NEXT:    vpblendmb %zmm2, %zmm0, %zmm2 {%k2}
-; AVX512VBMI2-NEXT:    vpsrlw $2, %zmm2, %zmm5
-; AVX512VBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm5, %zmm5
-; AVX512VBMI2-NEXT:    vmovdqu8 %zmm5, %zmm2 {%k1}
-; AVX512VBMI2-NEXT:    vpsrlw $1, %zmm2, %zmm5
+; AVX512VBMI2-NEXT:    vpmovb2m %zmm3, %k2
+; AVX512VBMI2-NEXT:    vpsllw $4, %zmm0, %zmm3
+; AVX512VBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm3, %zmm3
+; AVX512VBMI2-NEXT:    vpblendmb %zmm3, %zmm0, %zmm3 {%k2}
+; AVX512VBMI2-NEXT:    vpsllw $2, %zmm3, %zmm5
 ; AVX512VBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm5, %zmm5
+; AVX512VBMI2-NEXT:    vmovdqu8 %zmm5, %zmm3 {%k1}
 ; AVX512VBMI2-NEXT:    vpaddb %zmm4, %zmm4, %zmm4
 ; AVX512VBMI2-NEXT:    vpmovb2m %zmm4, %k1
-; AVX512VBMI2-NEXT:    vmovdqu8 %zmm5, %zmm2 {%k1}
-; AVX512VBMI2-NEXT:    vpandq %zmm3, %zmm1, %zmm1
+; AVX512VBMI2-NEXT:    vpaddb %zmm3, %zmm3, %zmm3 {%k1}
+; AVX512VBMI2-NEXT:    vpxor %xmm4, %xmm4, %xmm4
+; AVX512VBMI2-NEXT:    vpsubb %zmm1, %zmm4, %zmm1
+; AVX512VBMI2-NEXT:    vpandq %zmm2, %zmm1, %zmm1
 ; AVX512VBMI2-NEXT:    vpsllw $5, %zmm1, %zmm1
-; AVX512VBMI2-NEXT:    vpaddb %zmm1, %zmm1, %zmm3
-; AVX512VBMI2-NEXT:    vpmovb2m %zmm3, %k1
+; AVX512VBMI2-NEXT:    vpaddb %zmm1, %zmm1, %zmm2
+; AVX512VBMI2-NEXT:    vpmovb2m %zmm2, %k1
 ; AVX512VBMI2-NEXT:    vpmovb2m %zmm1, %k2
-; AVX512VBMI2-NEXT:    vpsllw $4, %zmm0, %zmm1
+; AVX512VBMI2-NEXT:    vpsrlw $4, %zmm0, %zmm1
 ; AVX512VBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
 ; AVX512VBMI2-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k2}
-; AVX512VBMI2-NEXT:    vpsllw $2, %zmm0, %zmm1
+; AVX512VBMI2-NEXT:    vpsrlw $2, %zmm0, %zmm1
 ; AVX512VBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
 ; AVX512VBMI2-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k1}
-; AVX512VBMI2-NEXT:    vpaddb %zmm3, %zmm3, %zmm1
-; AVX512VBMI2-NEXT:    vpmovb2m %zmm1, %k1
-; AVX512VBMI2-NEXT:    vpaddb %zmm0, %zmm0, %zmm0 {%k1}
-; AVX512VBMI2-NEXT:    vporq %zmm2, %zmm0, %zmm0
+; AVX512VBMI2-NEXT:    vpsrlw $1, %zmm0, %zmm1
+; AVX512VBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
+; AVX512VBMI2-NEXT:    vpaddb %zmm2, %zmm2, %zmm2
+; AVX512VBMI2-NEXT:    vpmovb2m %zmm2, %k1
+; AVX512VBMI2-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k1}
+; AVX512VBMI2-NEXT:    vporq %zmm0, %zmm3, %zmm0
 ; AVX512VBMI2-NEXT:    retq
 ;
 ; AVX512VLVBMI2-LABEL: var_funnnel_v64i8:
 ; AVX512VLVBMI2:       # %bb.0:
-; AVX512VLVBMI2-NEXT:    vpxor %xmm2, %xmm2, %xmm2
-; AVX512VLVBMI2-NEXT:    vpsubb %zmm1, %zmm2, %zmm2
-; AVX512VLVBMI2-NEXT:    vmovdqa64 {{.*#+}} zmm3 = [7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7]
-; AVX512VLVBMI2-NEXT:    vpandq %zmm3, %zmm2, %zmm2
-; AVX512VLVBMI2-NEXT:    vpsllw $5, %zmm2, %zmm2
-; AVX512VLVBMI2-NEXT:    vpaddb %zmm2, %zmm2, %zmm4
+; AVX512VLVBMI2-NEXT:    vmovdqa64 {{.*#+}} zmm2 = [7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7]
+; AVX512VLVBMI2-NEXT:    vpandq %zmm2, %zmm1, %zmm3
+; AVX512VLVBMI2-NEXT:    vpsllw $5, %zmm3, %zmm3
+; AVX512VLVBMI2-NEXT:    vpaddb %zmm3, %zmm3, %zmm4
 ; AVX512VLVBMI2-NEXT:    vpmovb2m %zmm4, %k1
-; AVX512VLVBMI2-NEXT:    vpmovb2m %zmm2, %k2
-; AVX512VLVBMI2-NEXT:    vpsrlw $4, %zmm0, %zmm2
-; AVX512VLVBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm2, %zmm2
-; AVX512VLVBMI2-NEXT:    vpblendmb %zmm2, %zmm0, %zmm2 {%k2}
-; AVX512VLVBMI2-NEXT:    vpsrlw $2, %zmm2, %zmm5
-; AVX512VLVBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm5, %zmm5
-; AVX512VLVBMI2-NEXT:    vmovdqu8 %zmm5, %zmm2 {%k1}
-; AVX512VLVBMI2-NEXT:    vpsrlw $1, %zmm2, %zmm5
+; AVX512VLVBMI2-NEXT:    vpmovb2m %zmm3, %k2
+; AVX512VLVBMI2-NEXT:    vpsllw $4, %zmm0, %zmm3
+; AVX512VLVBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm3, %zmm3
+; AVX512VLVBMI2-NEXT:    vpblendmb %zmm3, %zmm0, %zmm3 {%k2}
+; AVX512VLVBMI2-NEXT:    vpsllw $2, %zmm3, %zmm5
 ; AVX512VLVBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm5, %zmm5
+; AVX512VLVBMI2-NEXT:    vmovdqu8 %zmm5, %zmm3 {%k1}
 ; AVX512VLVBMI2-NEXT:    vpaddb %zmm4, %zmm4, %zmm4
 ; AVX512VLVBMI2-NEXT:    vpmovb2m %zmm4, %k1
-; AVX512VLVBMI2-NEXT:    vmovdqu8 %zmm5, %zmm2 {%k1}
-; AVX512VLVBMI2-NEXT:    vpandq %zmm3, %zmm1, %zmm1
+; AVX512VLVBMI2-NEXT:    vpaddb %zmm3, %zmm3, %zmm3 {%k1}
+; AVX512VLVBMI2-NEXT:    vpxor %xmm4, %xmm4, %xmm4
+; AVX512VLVBMI2-NEXT:    vpsubb %zmm1, %zmm4, %zmm1
+; AVX512VLVBMI2-NEXT:    vpandq %zmm2, %zmm1, %zmm1
 ; AVX512VLVBMI2-NEXT:    vpsllw $5, %zmm1, %zmm1
-; AVX512VLVBMI2-NEXT:    vpaddb %zmm1, %zmm1, %zmm3
-; AVX512VLVBMI2-NEXT:    vpmovb2m %zmm3, %k1
+; AVX512VLVBMI2-NEXT:    vpaddb %zmm1, %zmm1, %zmm2
+; AVX512VLVBMI2-NEXT:    vpmovb2m %zmm2, %k1
 ; AVX512VLVBMI2-NEXT:    vpmovb2m %zmm1, %k2
-; AVX512VLVBMI2-NEXT:    vpsllw $4, %zmm0, %zmm1
+; AVX512VLVBMI2-NEXT:    vpsrlw $4, %zmm0, %zmm1
 ; AVX512VLVBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
 ; AVX512VLVBMI2-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k2}
-; AVX512VLVBMI2-NEXT:    vpsllw $2, %zmm0, %zmm1
+; AVX512VLVBMI2-NEXT:    vpsrlw $2, %zmm0, %zmm1
 ; AVX512VLVBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
 ; AVX512VLVBMI2-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k1}
-; AVX512VLVBMI2-NEXT:    vpaddb %zmm3, %zmm3, %zmm1
-; AVX512VLVBMI2-NEXT:    vpmovb2m %zmm1, %k1
-; AVX512VLVBMI2-NEXT:    vpaddb %zmm0, %zmm0, %zmm0 {%k1}
-; AVX512VLVBMI2-NEXT:    vporq %zmm2, %zmm0, %zmm0
+; AVX512VLVBMI2-NEXT:    vpsrlw $1, %zmm0, %zmm1
+; AVX512VLVBMI2-NEXT:    vpandq {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %zmm1, %zmm1
+; AVX512VLVBMI2-NEXT:    vpaddb %zmm2, %zmm2, %zmm2
+; AVX512VLVBMI2-NEXT:    vpmovb2m %zmm2, %k1
+; AVX512VLVBMI2-NEXT:    vmovdqu8 %zmm1, %zmm0 {%k1}
+; AVX512VLVBMI2-NEXT:    vporq %zmm0, %zmm3, %zmm0
 ; AVX512VLVBMI2-NEXT:    retq
   %res = call <64 x i8> @llvm.fshl.v64i8(<64 x i8> %x, <64 x i8> %x, <64 x i8> %amt)
   ret <64 x i8> %res