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[X86] When lowering uniform shifts, use X86ISD::VZEXT instead of using a ZERO_EXTEND_VECTOR_INREG. If we emit the ZERO_EXTEND_VECTOR_INREG too late it doesn't get lowered properly and makes it through to isel and fails. 

Fixes PR31593.

llvm-svn: 291535
This commit is contained in:
Craig Topper 2017-01-10 04:12:24 +00:00
parent d915d6ba57
commit 2ed461e5c4
1 changed files with 4 additions and 4 deletions
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8
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -18418,13 +18418,13 @@ static SDValue getTargetVShiftNode(unsigned Opc, const SDLoc &dl, MVT VT,
ShAmt = DAG.getNode(ISD::SCALAR_TO_VECTOR, SDLoc(ShAmt), MVT::v2i64, ShAmt);
else if (Subtarget.hasSSE41() && ShAmt.getOpcode() == ISD::ZERO_EXTEND &&
ShAmt.getOperand(0).getSimpleValueType() == MVT::i16) {
SDValue Op0 = ShAmt.getOperand(0);
Op0 = DAG.getNode(ISD::SCALAR_TO_VECTOR, SDLoc(Op0), MVT::v8i16, Op0);
ShAmt = DAG.getZeroExtendVectorInReg(Op0, SDLoc(Op0), MVT::v2i64);
ShAmt = ShAmt.getOperand(0);
ShAmt = DAG.getNode(ISD::SCALAR_TO_VECTOR, SDLoc(ShAmt), MVT::v8i16, ShAmt);
ShAmt = DAG.getNode(X86ISD::VZEXT, SDLoc(ShAmt), MVT::v2i64, ShAmt);
} else if (Subtarget.hasSSE41() &&
ShAmt.getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
ShAmt = DAG.getNode(ISD::SCALAR_TO_VECTOR, SDLoc(ShAmt), MVT::v4i32, ShAmt);
ShAmt = DAG.getZeroExtendVectorInReg(ShAmt, SDLoc(ShAmt), MVT::v2i64);
ShAmt = DAG.getNode(X86ISD::VZEXT, SDLoc(ShAmt), MVT::v2i64, ShAmt);
} else {
SmallVector<SDValue, 4> ShOps = {ShAmt, DAG.getConstant(0, dl, SVT),
DAG.getUNDEF(SVT), DAG.getUNDEF(SVT)};