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Avoid creating virtual registers for unused values.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101480 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-04-16 17:15:02 +00:00
parent ac7d05c4bf
commit 33b7a291aa
2 changed files with 5 additions and 5 deletions
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8
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -918,10 +918,10 @@ void SelectionDAGBuilder::visitRet(const ReturnInst &I) {
/// created for it, emit nodes to copy the value into the virtual
/// registers.
void SelectionDAGBuilder::CopyToExportRegsIfNeeded(const Value *V) {
if (!V->use_empty()) {
DenseMap<const Value *, unsigned>::iterator VMI = FuncInfo.ValueMap.find(V);
if (VMI != FuncInfo.ValueMap.end())
CopyValueToVirtualRegister(V, VMI->second);
DenseMap<const Value *, unsigned>::iterator VMI = FuncInfo.ValueMap.find(V);
if (VMI != FuncInfo.ValueMap.end()) {
assert(!V->use_empty() && "Unused value assigned virtual registers!");
CopyValueToVirtualRegister(V, VMI->second);
}
}

2
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -834,7 +834,7 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) {
BI->dump();
}
if (!BI->getType()->isVoidTy()) {
if (!BI->getType()->isVoidTy() && !BI->use_empty()) {
unsigned &R = FuncInfo->ValueMap[BI];
if (!R)
R = FuncInfo->CreateRegForValue(BI);