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Do not emit copies for physical register output if it's not used.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40722 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-08-02 05:29:38 +00:00
parent 0a2a515c5b
commit 33d5595d66
3 changed files with 32 additions and 2 deletions
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3
lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
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@@ -676,7 +676,8 @@ void ScheduleDAG::EmitNode(SDNode *Node,
if (HasPhysRegOuts) {
for (unsigned i = II.numDefs; i < NumResults; ++i) {
unsigned Reg = II.ImplicitDefs[i - II.numDefs];
EmitCopyFromReg(Node, i, Reg, VRBaseMap);
if (Node->hasAnyUseOfValue(i))
EmitCopyFromReg(Node, i, Reg, VRBaseMap);
}
}
} else {