Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -19,7 +19,6 @@
 #include "X86InstrBuilder.h"
 #include "X86IntrinsicsInfo.h"
 #include "X86MachineFunctionInfo.h"
-#include "X86ShuffleDecodeConstantPool.h"
 #include "X86TargetMachine.h"
 #include "X86TargetObjectFile.h"
 #include "llvm/ADT/SmallBitVector.h"
@@ -6136,8 +6135,9 @@
     Ops.push_back(N->getOperand(0));
     Ops.push_back(N->getOperand(2));
     SDValue MaskNode = N->getOperand(1);
-    if (auto *C = getTargetConstantFromNode(MaskNode)) {
-      DecodeVPERMV3Mask(C, MaskEltSize, VT.getSizeInBits(), Mask);
+    if (getTargetShuffleMaskIndices(MaskNode, MaskEltSize, RawMask,
+                                    RawUndefs)) {
+      DecodeVPERMV3Mask(RawMask, RawUndefs, Mask);
       break;
     }
     return false;
Index: test/CodeGen/X86/avx512vbmi-intrinsics-upgrade.ll
===================================================================
--- test/CodeGen/X86/avx512vbmi-intrinsics-upgrade.ll
+++ test/CodeGen/X86/avx512vbmi-intrinsics-upgrade.ll
@@ -41,8 +41,8 @@
 ; X86-NEXT:    vpermt2b %zmm2, %zmm1, %zmm3 # encoding: [0x62,0xf2,0x75,0x48,0x7d,0xda]
 ; X86-NEXT:    kmovq {{[0-9]+}}(%esp), %k1 # encoding: [0xc4,0xe1,0xf8,0x90,0x4c,0x24,0x04]
 ; X86-NEXT:    vpermi2b %zmm2, %zmm0, %zmm1 {%k1} # encoding: [0x62,0xf2,0x7d,0x49,0x75,0xca]
-; X86-NEXT:    vpxor %xmm4, %xmm4, %xmm4 # encoding: [0xc5,0xd9,0xef,0xe4]
-; X86-NEXT:    vpermi2b %zmm2, %zmm0, %zmm4 {%k1} {z} # encoding: [0x62,0xf2,0x7d,0xc9,0x75,0xe2]
+; X86-NEXT:    vmovdqa64 %zmm1, %zmm4 # encoding: [0x62,0xf1,0xfd,0x48,0x6f,0xe1]
+; X86-NEXT:    vpermi2b %zmm2, %zmm0, %zmm4 {%k1} # encoding: [0x62,0xf2,0x7d,0x49,0x75,0xe2]
 ; X86-NEXT:    vpaddb %zmm3, %zmm4, %zmm0 # encoding: [0x62,0xf1,0x5d,0x48,0xfc,0xc3]
 ; X86-NEXT:    vpaddb %zmm0, %zmm1, %zmm0 # encoding: [0x62,0xf1,0x75,0x48,0xfc,0xc0]
 ; X86-NEXT:    retl # encoding: [0xc3]
@@ -53,13 +53,13 @@
 ; X64-NEXT:    vpermt2b %zmm2, %zmm1, %zmm3 # encoding: [0x62,0xf2,0x75,0x48,0x7d,0xda]
 ; X64-NEXT:    kmovq %rdi, %k1 # encoding: [0xc4,0xe1,0xfb,0x92,0xcf]
 ; X64-NEXT:    vpermi2b %zmm2, %zmm0, %zmm1 {%k1} # encoding: [0x62,0xf2,0x7d,0x49,0x75,0xca]
-; X64-NEXT:    vpxor %xmm4, %xmm4, %xmm4 # encoding: [0xc5,0xd9,0xef,0xe4]
-; X64-NEXT:    vpermi2b %zmm2, %zmm0, %zmm4 {%k1} {z} # encoding: [0x62,0xf2,0x7d,0xc9,0x75,0xe2]
+; X64-NEXT:    vmovdqa64 %zmm1, %zmm4 # encoding: [0x62,0xf1,0xfd,0x48,0x6f,0xe1]
+; X64-NEXT:    vpermi2b %zmm2, %zmm0, %zmm4 {%k1} # encoding: [0x62,0xf2,0x7d,0x49,0x75,0xe2]
 ; X64-NEXT:    vpaddb %zmm3, %zmm4, %zmm0 # encoding: [0x62,0xf1,0x5d,0x48,0xfc,0xc3]
 ; X64-NEXT:    vpaddb %zmm0, %zmm1, %zmm0 # encoding: [0x62,0xf1,0x75,0x48,0xfc,0xc0]
 ; X64-NEXT:    retq # encoding: [0xc3]
   %res = call <64 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.512(<64 x i8> %x0, <64 x i8> %x1, <64 x i8> %x2, i64 %x3)
-  %res1 = call <64 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.512(<64 x i8> %x0, <64 x i8> zeroinitializer, <64 x i8> %x2, i64 %x3)
+  %res1 = call <64 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.512(<64 x i8> %x0, <64 x i8> %res, <64 x i8> %x2, i64 %x3)
   %res2 = call <64 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.512(<64 x i8> %x0, <64 x i8> %x1, <64 x i8> %x2, i64 -1)
   %res3 = add <64 x i8> %res, %res1
   %res4 = add <64 x i8> %res3, %res2
Index: test/CodeGen/X86/avx512vbmivl-intrinsics-upgrade.ll
===================================================================
--- test/CodeGen/X86/avx512vbmivl-intrinsics-upgrade.ll
+++ test/CodeGen/X86/avx512vbmivl-intrinsics-upgrade.ll
@@ -71,8 +71,8 @@
 ; X86-NEXT:    vpermt2b %xmm2, %xmm1, %xmm3 # encoding: [0x62,0xf2,0x75,0x08,0x7d,0xda]
 ; X86-NEXT:    kmovw {{[0-9]+}}(%esp), %k1 # encoding: [0xc5,0xf8,0x90,0x4c,0x24,0x04]
 ; X86-NEXT:    vpermi2b %xmm2, %xmm0, %xmm1 {%k1} # encoding: [0x62,0xf2,0x7d,0x09,0x75,0xca]
-; X86-NEXT:    vpxor %xmm4, %xmm4, %xmm4 # EVEX TO VEX Compression encoding: [0xc5,0xd9,0xef,0xe4]
-; X86-NEXT:    vpermi2b %xmm2, %xmm0, %xmm4 {%k1} {z} # encoding: [0x62,0xf2,0x7d,0x89,0x75,0xe2]
+; X86-NEXT:    vmovdqa %xmm1, %xmm4 # EVEX TO VEX Compression encoding: [0xc5,0xf9,0x6f,0xe1]
+; X86-NEXT:    vpermi2b %xmm2, %xmm0, %xmm4 {%k1} # encoding: [0x62,0xf2,0x7d,0x09,0x75,0xe2]
 ; X86-NEXT:    vpaddb %xmm3, %xmm4, %xmm0 # EVEX TO VEX Compression encoding: [0xc5,0xd9,0xfc,0xc3]
 ; X86-NEXT:    vpaddb %xmm0, %xmm1, %xmm0 # EVEX TO VEX Compression encoding: [0xc5,0xf1,0xfc,0xc0]
 ; X86-NEXT:    retl # encoding: [0xc3]
@@ -83,13 +83,13 @@
 ; X64-NEXT:    vpermt2b %xmm2, %xmm1, %xmm3 # encoding: [0x62,0xf2,0x75,0x08,0x7d,0xda]
 ; X64-NEXT:    kmovd %edi, %k1 # encoding: [0xc5,0xfb,0x92,0xcf]
 ; X64-NEXT:    vpermi2b %xmm2, %xmm0, %xmm1 {%k1} # encoding: [0x62,0xf2,0x7d,0x09,0x75,0xca]
-; X64-NEXT:    vpxor %xmm4, %xmm4, %xmm4 # EVEX TO VEX Compression encoding: [0xc5,0xd9,0xef,0xe4]
-; X64-NEXT:    vpermi2b %xmm2, %xmm0, %xmm4 {%k1} {z} # encoding: [0x62,0xf2,0x7d,0x89,0x75,0xe2]
+; X64-NEXT:    vmovdqa %xmm1, %xmm4 # EVEX TO VEX Compression encoding: [0xc5,0xf9,0x6f,0xe1]
+; X64-NEXT:    vpermi2b %xmm2, %xmm0, %xmm4 {%k1} # encoding: [0x62,0xf2,0x7d,0x09,0x75,0xe2]
 ; X64-NEXT:    vpaddb %xmm3, %xmm4, %xmm0 # EVEX TO VEX Compression encoding: [0xc5,0xd9,0xfc,0xc3]
 ; X64-NEXT:    vpaddb %xmm0, %xmm1, %xmm0 # EVEX TO VEX Compression encoding: [0xc5,0xf1,0xfc,0xc0]
 ; X64-NEXT:    retq # encoding: [0xc3]
   %res = call <16 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.128(<16 x i8> %x0, <16 x i8> %x1, <16 x i8> %x2, i16 %x3)
-  %res1 = call <16 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.128(<16 x i8> %x0, <16 x i8> zeroinitializer, <16 x i8> %x2, i16 %x3)
+  %res1 = call <16 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.128(<16 x i8> %x0, <16 x i8> %res, <16 x i8> %x2, i16 %x3)
   %res2 = call <16 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.128(<16 x i8> %x0, <16 x i8> %x1, <16 x i8> %x2, i16 -1)
   %res3 = add <16 x i8> %res, %res1
   %res4 = add <16 x i8> %res3, %res2
@@ -105,8 +105,8 @@
 ; X86-NEXT:    vpermt2b %ymm2, %ymm1, %ymm3 # encoding: [0x62,0xf2,0x75,0x28,0x7d,0xda]
 ; X86-NEXT:    kmovd {{[0-9]+}}(%esp), %k1 # encoding: [0xc4,0xe1,0xf9,0x90,0x4c,0x24,0x04]
 ; X86-NEXT:    vpermi2b %ymm2, %ymm0, %ymm1 {%k1} # encoding: [0x62,0xf2,0x7d,0x29,0x75,0xca]
-; X86-NEXT:    vpxor %xmm4, %xmm4, %xmm4 # EVEX TO VEX Compression encoding: [0xc5,0xd9,0xef,0xe4]
-; X86-NEXT:    vpermi2b %ymm2, %ymm0, %ymm4 {%k1} {z} # encoding: [0x62,0xf2,0x7d,0xa9,0x75,0xe2]
+; X86-NEXT:    vmovdqa %ymm1, %ymm4 # EVEX TO VEX Compression encoding: [0xc5,0xfd,0x6f,0xe1]
+; X86-NEXT:    vpermi2b %ymm2, %ymm0, %ymm4 {%k1} # encoding: [0x62,0xf2,0x7d,0x29,0x75,0xe2]
 ; X86-NEXT:    vpaddb %ymm3, %ymm4, %ymm0 # EVEX TO VEX Compression encoding: [0xc5,0xdd,0xfc,0xc3]
 ; X86-NEXT:    vpaddb %ymm0, %ymm1, %ymm0 # EVEX TO VEX Compression encoding: [0xc5,0xf5,0xfc,0xc0]
 ; X86-NEXT:    retl # encoding: [0xc3]
@@ -117,13 +117,13 @@
 ; X64-NEXT:    vpermt2b %ymm2, %ymm1, %ymm3 # encoding: [0x62,0xf2,0x75,0x28,0x7d,0xda]
 ; X64-NEXT:    kmovd %edi, %k1 # encoding: [0xc5,0xfb,0x92,0xcf]
 ; X64-NEXT:    vpermi2b %ymm2, %ymm0, %ymm1 {%k1} # encoding: [0x62,0xf2,0x7d,0x29,0x75,0xca]
-; X64-NEXT:    vpxor %xmm4, %xmm4, %xmm4 # EVEX TO VEX Compression encoding: [0xc5,0xd9,0xef,0xe4]
-; X64-NEXT:    vpermi2b %ymm2, %ymm0, %ymm4 {%k1} {z} # encoding: [0x62,0xf2,0x7d,0xa9,0x75,0xe2]
+; X64-NEXT:    vmovdqa %ymm1, %ymm4 # EVEX TO VEX Compression encoding: [0xc5,0xfd,0x6f,0xe1]
+; X64-NEXT:    vpermi2b %ymm2, %ymm0, %ymm4 {%k1} # encoding: [0x62,0xf2,0x7d,0x29,0x75,0xe2]
 ; X64-NEXT:    vpaddb %ymm3, %ymm4, %ymm0 # EVEX TO VEX Compression encoding: [0xc5,0xdd,0xfc,0xc3]
 ; X64-NEXT:    vpaddb %ymm0, %ymm1, %ymm0 # EVEX TO VEX Compression encoding: [0xc5,0xf5,0xfc,0xc0]
 ; X64-NEXT:    retq # encoding: [0xc3]
   %res = call <32 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.256(<32 x i8> %x0, <32 x i8> %x1, <32 x i8> %x2, i32 %x3)
-  %res1 = call <32 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.256(<32 x i8> %x0, <32 x i8> zeroinitializer, <32 x i8> %x2, i32 %x3)
+  %res1 = call <32 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.256(<32 x i8> %x0, <32 x i8> %res, <32 x i8> %x2, i32 %x3)
   %res2 = call <32 x i8> @llvm.x86.avx512.mask.vpermi2var.qi.256(<32 x i8> %x0, <32 x i8> %x1, <32 x i8> %x2, i32 -1)
   %res3 = add <32 x i8> %res, %res1
   %res4 = add <32 x i8> %res3, %res2