[PATCH] D57407: [DAG][SystemZ] Define unwrapAddress for PCREL_WRAPPER.
Nirav Dave via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Jan 29 12:10:35 PST 2019
niravd created this revision.
niravd added reviewers: jonpa, uweigand.
Herald added a subscriber: hiraditya.
Like with X86, this allows better DAG-level alias analysis and
alignment inference for wrapped addresses.
Repository:
rL LLVM
https://reviews.llvm.org/D57407
Files:
llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
llvm/lib/Target/SystemZ/SystemZISelLowering.h
Index: llvm/lib/Target/SystemZ/SystemZISelLowering.h
===================================================================
--- llvm/lib/Target/SystemZ/SystemZISelLowering.h
+++ llvm/lib/Target/SystemZ/SystemZISelLowering.h
@@ -598,6 +598,8 @@
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.
Index: llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
===================================================================
--- llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -5775,6 +5775,12 @@
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()) {
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