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[DAG][SystemZ] Define unwrapAddress for PCREL_WRAPPER. 

Summary:
Like with X86, this allows better DAG-level alias analysis and
alignment inference for wrapped addresses.

Reviewers: jonpa, uweigand

Reviewed By: uweigand

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D57407

llvm-svn: 352786
This commit is contained in:
Nirav Dave 2019-01-31 19:58:34 +00:00
parent 82937e44bd
commit b792299d83
2 changed files with 8 additions and 0 deletions
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6
llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
View File

@ -5775,6 +5775,12 @@ SDValue SystemZTargetLowering::combineIntDIVREM(
return SDValue();
}
SDValue SystemZTargetLowering::unwrapAddress(SDValue N) const {
if (N->getOpcode() == SystemZISD::PCREL_WRAPPER)
return N->getOperand(0);
return N;
}
SDValue SystemZTargetLowering::PerformDAGCombine(SDNode *N,
DAGCombinerInfo &DCI) const {
switch(N->getOpcode()) {

2
llvm/lib/Target/SystemZ/SystemZISelLowering.h
View File

@ -598,6 +598,8 @@ private:
SDValue combineGET_CCMASK(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue combineIntDIVREM(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue unwrapAddress(SDValue N) const override;
// If the last instruction before MBBI in MBB was some form of COMPARE,
// try to replace it with a COMPARE AND BRANCH just before MBBI.
// CCMask and Target are the BRC-like operands for the branch.