diff options
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 275e876644c..0e119415303 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -40448,6 +40448,19 @@ static SDValue combineStore(SDNode *N, SelectionDAG &DAG, MVT::v16i8, St->getMemOperand()); } + // Try to fold a vpmovuswb 256->128 into a truncating store. + // FIXME: Generalize this to other types. + // FIXME: Do the same for signed saturation. + if (!St->isTruncatingStore() && VT == MVT::v16i8 && + St->getValue().getOpcode() == X86ISD::VTRUNCUS && + St->getValue().getOperand(0).getValueType() == MVT::v16i16 && + TLI.isTruncStoreLegal(MVT::v16i16, MVT::v16i8) && + St->getValue().hasOneUse()) { + return EmitTruncSStore(false /* Unsigned saturation */, St->getChain(), + dl, St->getValue().getOperand(0), St->getBasePtr(), + MVT::v16i8, St->getMemOperand(), DAG); + } + // Optimize trunc store (of multiple scalars) to shuffle and store. // First, pack all of the elements in one place. Next, store to memory // in fewer chunks. |
