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add a simple fast-path for dead allocas

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32750 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-12-22 23:14:42 +00:00
parent 29ee5c1ba4
commit add2bd7f59
1 changed files with 8 additions and 1 deletions
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9
lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@@ -139,6 +139,13 @@ bool SROA::performScalarRepl(Function &F) {
AllocationInst *AI = WorkList.back(); AllocationInst *AI = WorkList.back();
WorkList.pop_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 // If we can turn this aggregate value (potentially with casts) into a
// simple scalar value that can be mem2reg'd into a register value. // simple scalar value that can be mem2reg'd into a register value.
bool IsNotTrivial = false; bool IsNotTrivial = false;
@@ -232,7 +239,7 @@ bool SROA::performScalarRepl(Function &F) {
} }
// Finally, delete the Alloca instruction // Finally, delete the Alloca instruction
AI->getParent()->getInstList().erase(AI); AI->eraseFromParent();
NumReplaced++; NumReplaced++;
} }