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| author | Craig Topper <craig.topper@gmail.com> | 2013-01-28 07:41:18 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@gmail.com> | 2013-01-28 07:41:18 +0000 |
| commit | 467016e58d57021b14f2ae562d221f00b07cb254 (patch) | |
| tree | 8a2e7eef6908ad6a029e460d269771e67d98617f /lib/Target/X86/Utils | |
| parent | 6ab4cbc98636eecafb12393463453b567d58e22c (diff) | |
| download | external_llvm-467016e58d57021b14f2ae562d221f00b07cb254.zip external_llvm-467016e58d57021b14f2ae562d221f00b07cb254.tar.gz external_llvm-467016e58d57021b14f2ae562d221f00b07cb254.tar.bz2 | |
Fix 256-bit PALIGNR comment decoding to understand that it works on independent 256-bit lanes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173674 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/Utils')
| -rw-r--r-- | lib/Target/X86/Utils/X86ShuffleDecode.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/Target/X86/Utils/X86ShuffleDecode.cpp b/lib/Target/X86/Utils/X86ShuffleDecode.cpp index b490f27..bbd4904 100644 --- a/lib/Target/X86/Utils/X86ShuffleDecode.cpp +++ b/lib/Target/X86/Utils/X86ShuffleDecode.cpp @@ -66,8 +66,17 @@ void DecodePALIGNRMask(MVT VT, unsigned Imm, unsigned NumElts = VT.getVectorNumElements(); unsigned Offset = Imm * (VT.getVectorElementType().getSizeInBits() / 8); - for (unsigned i = 0; i != NumElts; ++i) - ShuffleMask.push_back((i + Offset) % (NumElts * 2)); + unsigned NumLanes = VT.getSizeInBits() / 128; + unsigned NumLaneElts = NumElts / NumLanes; + + for (unsigned l = 0; l != NumElts; l += NumLaneElts) { + for (unsigned i = 0; i != NumLaneElts; ++i) { + unsigned Base = i + Offset; + // if i+offset is out of this lane then we actually need the other source + if (Base >= NumLaneElts) Base += NumElts - NumLaneElts; + ShuffleMask.push_back(Base + l); + } + } } /// DecodePSHUFMask - This decodes the shuffle masks for pshufd, and vpermilp*. |