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| author | Craig Topper <craig.topper@gmail.com> | 2012-04-17 05:54:54 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@gmail.com> | 2012-04-17 05:54:54 +0000 |
| commit | 2091df3d09bba0705fc62d020e5177a246d67978 (patch) | |
| tree | 51bac4d8849f7e8bf6085f62747cd84260eb4ec1 /lib/Target/X86/Utils | |
| parent | e4576266f49169ad0ae112d9cb565e7d7c4bf24e (diff) | |
| download | external_llvm-2091df3d09bba0705fc62d020e5177a246d67978.zip external_llvm-2091df3d09bba0705fc62d020e5177a246d67978.tar.gz external_llvm-2091df3d09bba0705fc62d020e5177a246d67978.tar.bz2 | |
Don't decode vperm2i128 or vperm2f128 into a shuffle if bit 3 or 7 of the immediate is set.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154907 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/Utils')
| -rw-r--r-- | lib/Target/X86/Utils/X86ShuffleDecode.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/Target/X86/Utils/X86ShuffleDecode.cpp b/lib/Target/X86/Utils/X86ShuffleDecode.cpp index 32c722a..a802333 100644 --- a/lib/Target/X86/Utils/X86ShuffleDecode.cpp +++ b/lib/Target/X86/Utils/X86ShuffleDecode.cpp @@ -169,6 +169,9 @@ void DecodeUNPCKLMask(EVT VT, SmallVectorImpl<int> &ShuffleMask) { void DecodeVPERM2X128Mask(EVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) { + if (Imm & 0x88) + return; // Not a shuffle + unsigned HalfSize = VT.getVectorNumElements()/2; unsigned FstHalfBegin = (Imm & 0x3) * HalfSize; unsigned SndHalfBegin = ((Imm >> 4) & 0x3) * HalfSize; |