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add a simple fast-path for dead allocas 

llvm-svn: 32750
This commit is contained in:
Chris Lattner 2006-12-22 23:14:42 +00:00
parent cdd9807cba
commit f171af97d5
1 changed files with 8 additions and 1 deletions
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9
llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@ -139,6 +139,13 @@ bool SROA::performScalarRepl(Function &F) {
AllocationInst *AI = WorkList.back();
WorkList.pop_back();
// Handle dead allocas trivially. These can be formed by SROA'ing arrays
// with unused elements.
if (AI->use_empty()) {
AI->eraseFromParent();
continue;
}
// If we can turn this aggregate value (potentially with casts) into a
// simple scalar value that can be mem2reg'd into a register value.
bool IsNotTrivial = false;
@ -232,7 +239,7 @@ bool SROA::performScalarRepl(Function &F) {
}
// Finally, delete the Alloca instruction
AI->getParent()->getInstList().erase(AI);
AI->eraseFromParent();
NumReplaced++;
}