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add a simple fast-path for dead allocas
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32750 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -139,6 +139,13 @@ bool SROA::performScalarRepl(Function &F) {
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AllocationInst *AI = WorkList.back();
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WorkList.pop_back();
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// Handle dead allocas trivially. These can be formed by SROA'ing arrays
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// with unused elements.
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if (AI->use_empty()) {
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AI->eraseFromParent();
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continue;
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}
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// If we can turn this aggregate value (potentially with casts) into a
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// simple scalar value that can be mem2reg'd into a register value.
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bool IsNotTrivial = false;
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@ -232,7 +239,7 @@ bool SROA::performScalarRepl(Function &F) {
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}
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// Finally, delete the Alloca instruction
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AI->getParent()->getInstList().erase(AI);
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AI->eraseFromParent();
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NumReplaced++;
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}
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