[PATCH] D44586: [AArch64] Skip an unnecessary getCopyToReg in DYNAMIC_STACKALLOC

[Martin Storsjö via Phabricator via llvm-commits]

mstorsjo created this revision.
mstorsjo added a reviewer: aemerson.
Herald added subscribers: kristof.beyls, javed.absar, rengolin.

Repository:
  rL LLVM

https://reviews.llvm.org/D44586

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp


Index: lib/Target/AArch64/AArch64ISelLowering.cpp
===================================================================
--- lib/Target/AArch64/AArch64ISelLowering.cpp
+++ lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -7545,13 +7545,10 @@
   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);


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