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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2018-10-22 18:58:32 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2018-10-22 18:58:32 +0000 |
| commit | 794f85cd937c7a169050f9c1b9b678357ce04a46 (patch) | |
| tree | 8a1bcb5a7e7e1267b4f573400d64d9896632f89b /llvm/lib/Target/X86/Utils | |
| parent | 036e54d32ef9ad7f8e1f7f277ec96338bc26eac5 (diff) | |
| download | bcm5719-llvm-794f85cd937c7a169050f9c1b9b678357ce04a46.tar.gz bcm5719-llvm-794f85cd937c7a169050f9c1b9b678357ce04a46.zip | |
Revert rL344933 from llvm/trunk: [X86][SSE] Tidyup DecodeVPERMILPMask shuffle mask decoding
We can't safely assume that certain RawMask entries are UNDEF as most variable shuffles ignore non-index bits.
........
Add support for UNDEF raw mask elements and remove the ConstantPool DecodeVPERMILPMask usage in X86ISelLowering.cpp
llvm-svn: 344936
Diffstat (limited to 'llvm/lib/Target/X86/Utils')
| -rw-r--r-- | llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp b/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp index 4bd5df44abd..fe567f4cece 100644 --- a/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp +++ b/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp @@ -501,10 +501,6 @@ void DecodeVPERMILPMask(unsigned NumElts, unsigned ScalarBits, for (unsigned i = 0, e = RawMask.size(); i < e; ++i) { uint64_t M = RawMask[i]; - if (M == (uint64_t)SM_SentinelUndef) { - ShuffleMask.push_back(M); - continue; - } M = (ScalarBits == 64 ? ((M >> 1) & 0x1) : (M & 0x3)); unsigned LaneOffset = i & ~(NumEltsPerLane - 1); ShuffleMask.push_back((int)(LaneOffset + M)); |
