[X86][SSE] Refactored PMOVZX shuffle decoding to use scalar input types

First step towards being able to decode AVX512 PMOVZX instructions without a massive bloat in the shuffle decode switch statement.

This should also make it easier to decode X86ISD::VZEXT target shuffles in the future.

llvm-svn: 259995

1 files changed, 2 insertions, 4 deletions

diff --git a/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp b/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp
index 619f7c8d25d..08c039f3dec 100644
--- a/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp
+++ b/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp
@@ -339,15 +339,13 @@ void DecodeVPERMMask(unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
   }
 }
 
-void DecodeZeroExtendMask(MVT SrcVT, MVT DstVT, SmallVectorImpl<int> &Mask) {
+void DecodeZeroExtendMask(MVT SrcScalarVT, MVT DstVT, SmallVectorImpl<int> &Mask) {
   unsigned NumDstElts = DstVT.getVectorNumElements();
-  unsigned SrcScalarBits = SrcVT.getScalarSizeInBits();
+  unsigned SrcScalarBits = SrcScalarVT.getSizeInBits();
   unsigned DstScalarBits = DstVT.getScalarSizeInBits();
   unsigned Scale = DstScalarBits / SrcScalarBits;
   assert(SrcScalarBits < DstScalarBits &&
          "Expected zero extension mask to increase scalar size");
-  assert(SrcVT.getVectorNumElements() >= NumDstElts &&
-         "Too many zero extension lanes");
 
   for (unsigned i = 0; i != NumDstElts; i++) {
     Mask.push_back(i);