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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
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@ -767,7 +767,7 @@ SDOperand X86TargetLowering::LowerRET(SDOperand Op, SelectionDAG &DAG) {
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// If this is a load into a scalarsse value, don't store the loaded value
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// back to the stack, only to reload it: just replace the scalar-sse load.
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if (ISD::isNON_EXTLoad(Value.Val) &&
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(Chain == Value.getValue(1) || Chain == Value.getOperand(0))) {
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Chain.reachesChainWithoutSideEffects(Value.getOperand(0))) {
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Chain = Value.getOperand(0);
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MemLoc = Value.getOperand(1);
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} else {
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