From: Craig Topper <craig.topper@gmail.com>
Date: Mon, 17 Feb 2020 22:49:17 +0000 (-0800)
Subject: [X86] Add one use check to '0-x == y --> x+y == 0' in EmitCmp.
X-Git-Tag: llvmorg-12-init~14432
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3f4490d384c8b3c41bd9f8a4a17467769c7a55c0;p=platform%2Fupstream%2Fllvm.git

[X86] Add one use check to '0-x == y --> x+y == 0' in EmitCmp.

I failed to copy it when I moved this in
b62de210cf50ccb6822260e4075dd93333adb23e
---

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 96d41ed..275a7bd 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -21212,7 +21212,7 @@ static SDValue EmitCmp(SDValue Op0, SDValue Op1, unsigned X86CC,
   // 0-x == y --> x+y == 0
   // 0-x != y --> x+y != 0
   if (Op0.getOpcode() == ISD::SUB && isNullConstant(Op0.getOperand(0)) &&
-      (X86CC == X86::COND_E || X86CC == X86::COND_NE)) {
+      Op0.hasOneUse() && (X86CC == X86::COND_E || X86CC == X86::COND_NE)) {
     SDVTList VTs = DAG.getVTList(CmpVT, MVT::i32);
     SDValue Add = DAG.getNode(X86ISD::ADD, dl, VTs, Op0.getOperand(1), Op1);
     return Add.getValue(1);
@@ -21221,7 +21221,7 @@ static SDValue EmitCmp(SDValue Op0, SDValue Op1, unsigned X86CC,
   // x == 0-y --> x+y == 0
   // x != 0-y --> x+y != 0
   if (Op1.getOpcode() == ISD::SUB && isNullConstant(Op1.getOperand(0)) &&
-      (X86CC == X86::COND_E || X86CC == X86::COND_NE)) {
+      Op1.hasOneUse() && (X86CC == X86::COND_E || X86CC == X86::COND_NE)) {
     SDVTList VTs = DAG.getVTList(CmpVT, MVT::i32);
     SDValue Add = DAG.getNode(X86ISD::ADD, dl, VTs, Op0, Op1.getOperand(1));
     return Add.getValue(1);