From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Thu, 3 Feb 2011 03:58:05 +0000 (+0000)
Subject: Fix PR9127 by reversing the operands even if they have more then one use.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f297c931913ec4285395fa278fa9c9898685c469;p=oota-llvm.git

Fix PR9127 by reversing the operands even if they have more then one use.
Reversing the operands allows us to fold, but doesn't force us to. Also, at
this point the DAG is still being optimized, so the check for hasOneUse is not
very precise.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124773 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index ab75db28eae..c14e9db1bd3 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2712,8 +2712,8 @@ static unsigned TranslateX86CC(ISD::CondCode SetCCOpcode, bool isFP,
   // First determine if it is required or is profitable to flip the operands.
 
   // If LHS is a foldable load, but RHS is not, flip the condition.
-  if ((ISD::isNON_EXTLoad(LHS.getNode()) && LHS.hasOneUse()) &&
-      !(ISD::isNON_EXTLoad(RHS.getNode()) && RHS.hasOneUse())) {
+  if (ISD::isNON_EXTLoad(LHS.getNode()) &&
+      !ISD::isNON_EXTLoad(RHS.getNode())) {
     SetCCOpcode = getSetCCSwappedOperands(SetCCOpcode);
     std::swap(LHS, RHS);
   }
diff --git a/test/CodeGen/X86/pr9127.ll b/test/CodeGen/X86/pr9127.ll
new file mode 100644
index 00000000000..af08490b83d
--- /dev/null
+++ b/test/CodeGen/X86/pr9127.ll
@@ -0,0 +1,12 @@
+; RUN: llc < %s | FileCheck %s
+
+define i8 @foobar(double %d, double* %x) {
+entry:
+  %tmp2 = load double* %x, align 8
+  %cmp = fcmp oeq double %tmp2, %d
+  %conv3 = zext i1 %cmp to i8
+  ret i8 %conv3
+}
+
+; test that the load is folded.
+; CHECK: ucomisd	(%rdi), %xmm0