diff options
Diffstat (limited to 'contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp b/contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp index 8b87c1f..bbd4904 100644 --- a/contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp +++ b/contrib/llvm/lib/Target/X86/Utils/X86ShuffleDecode.cpp @@ -61,6 +61,24 @@ void DecodeMOVLHPSMask(unsigned NElts, SmallVectorImpl<int> &ShuffleMask) { ShuffleMask.push_back(NElts+i); } +void DecodePALIGNRMask(MVT VT, unsigned Imm, + SmallVectorImpl<int> &ShuffleMask) { + unsigned NumElts = VT.getVectorNumElements(); + unsigned Offset = Imm * (VT.getVectorElementType().getSizeInBits() / 8); + + 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*. /// VT indicates the type of the vector allowing it to handle different /// datatypes and vector widths. |
