make the 'fp return in ST(0)' optimization smart enough to
look through token factor
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46053 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index be82653..eb8e5e3 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -767,7 +767,7 @@
// If this is a load into a scalarsse value, don't store the loaded value
// back to the stack, only to reload it: just replace the scalar-sse load.
if (ISD::isNON_EXTLoad(Value.Val) &&
- (Chain == Value.getValue(1) || Chain == Value.getOperand(0))) {
+ Chain.reachesChainWithoutSideEffects(Value.getOperand(0))) {
Chain = Value.getOperand(0);
MemLoc = Value.getOperand(1);
} else {