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[AArch64] Skip an unnecessary getCopyToReg in DYNAMIC_STACKALLOC 

Differential Revision: https://reviews.llvm.org/D44586

llvm-svn: 327779
This commit is contained in:
Martin Storsjo 2018-03-17 20:08:48 +00:00
parent 5f0ab71b62
commit 36d6419cc5
1 changed files with 2 additions and 5 deletions
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7
llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
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@ -7527,13 +7527,10 @@ AArch64TargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
SDValue SP = DAG.getCopyFromReg(Chain, dl, AArch64::SP, MVT::i64);
Chain = SP.getValue(1);
SP = DAG.getNode(ISD::SUB, dl, MVT::i64, SP, Size);
Chain = DAG.getCopyToReg(Chain, dl, AArch64::SP, SP);
if (Align) {
if (Align)
SP = DAG.getNode(ISD::AND, dl, VT, SP.getValue(0),
DAG.getConstant(-(uint64_t)Align, dl, VT));
Chain = DAG.getCopyToReg(Chain, dl, AArch64::SP, SP);
}
Chain = DAG.getCopyToReg(Chain, dl, AArch64::SP, SP);
Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, dl, true),
DAG.getIntPtrConstant(0, dl, true), SDValue(), dl);