[PATCH] D57534: [DAG][ARM] Define upwrapAddress for ARM backend.

[Nirav Dave via Phabricator via llvm-commits]

niravd created this revision.
niravd added reviewers: arsenm, efriedma, t.p.northover.
Herald added subscribers: hiraditya, kristof.beyls, javed.absar, wdng.

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


Repository:
  rL LLVM

https://reviews.llvm.org/D57534

Files:
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/lib/Target/ARM/ARMISelLowering.h


Index: llvm/lib/Target/ARM/ARMISelLowering.h
===================================================================
--- llvm/lib/Target/ARM/ARMISelLowering.h
+++ llvm/lib/Target/ARM/ARMISelLowering.h
@@ -309,6 +309,8 @@
     void AdjustInstrPostInstrSelection(MachineInstr &MI,
                                        SDNode *Node) const override;
 
+    SDValue unwrapAddress(SDValue N) const override;
+
     SDValue PerformCMOVCombine(SDNode *N, SelectionDAG &DAG) const;
     SDValue PerformBRCONDCombine(SDNode *N, SelectionDAG &DAG) const;
     SDValue PerformCMOVToBFICombine(SDNode *N, SelectionDAG &DAG) const;
Index: llvm/lib/Target/ARM/ARMISelLowering.cpp
===================================================================
--- llvm/lib/Target/ARM/ARMISelLowering.cpp
+++ llvm/lib/Target/ARM/ARMISelLowering.cpp
@@ -9656,6 +9656,14 @@
   MO.setIsDef(true);
 }
 
+SDValue ARMTargetLowering::unwrapAddress(SDValue N) const {
+  if (N->getOpcode() == ARMISD::Wrapper ||
+      N->getOpcode() == ARMISD::WrapperPIC ||
+      N->getOpcode() == ARMISD::WrapperJT)
+    return N->getOperand(0);
+  return N;
+}
+
 //===----------------------------------------------------------------------===//
 //                           ARM Optimization Hooks
 //===----------------------------------------------------------------------===//


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D57534.184563.patch
Type: text/x-patch
Size: 1331 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20190131/b4c824d7/attachment.bin>