diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 571fd29fef6..3e790b47ed5 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -3630,8 +3630,11 @@ SDValue LowerVECTOR_SHUFFLEv8i16(SDValue V1, SDValue V2, // Rewrite the MaskVals and assign NewV to V1 if NewV now contains all the // source words for the shuffle, to aid later transformations. bool AllWordsInNewV = true; + bool InOrder[2] = { true, true }; for (unsigned i = 0; i != 8; ++i) { int idx = MaskVals[i]; + if (idx != (int)i) + InOrder[i/4] = false; if (idx < 0 || (idx/4) == BestLoQuad || (idx/4) == BestHiQuad) continue; AllWordsInNewV = false; @@ -3658,7 +3661,7 @@ SDValue LowerVECTOR_SHUFFLEv8i16(SDValue V1, SDValue V2, // If we've eliminated the use of V2, and the new mask is a pshuflw or // pshufhw, that's as cheap as it gets. Return the new shuffle. - if (pshufhw || pshuflw) { + if ((pshufhw && InOrder[0]) || (pshuflw && InOrder[1])) { MaskV.clear(); for (unsigned i = 0; i != 8; ++i) MaskV.push_back((MaskVals[i] < 0) ? DAG.getUNDEF(MVT::i16) |
