diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 043110867f..8f69b0e314 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -6241,6 +6241,13 @@ bool CanXFormVExtractWithShuffleIntoLoad(SDValue V, SelectionDAG &DAG, int Idx = (Elt > NumElems) ? -1 : SVOp->getMaskElt(Elt); V = (Idx < (int)NumElems) ? V.getOperand(0) : V.getOperand(1); + // If we are accessing the upper part of a YMM register + // then the EXTRACT_VECTOR_ELT is likely to be legalized to a sequence of + // EXTRACT_SUBVECTOR + EXTRACT_VECTOR_ELT, which are not detected at this point + // because the legalization of N did not happen yet. + if (Idx >= NumElems/2 && VT.getSizeInBits() == 256) + return false; + // Skip one more bit_convert if necessary if (V.getOpcode() == ISD::BITCAST) V = V.getOperand(0); |