diff options
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*. |