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Fix a bug where we didn't realize that vaarg reads memory. This fixes
Transforms/DeadStoreElimination/2005-11-30-vaarg.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24545 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -96,6 +96,13 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
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}
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if (!isa<StoreInst>(I) || cast<StoreInst>(I)->isVolatile()) {
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// If this is a vaarg instruction, it reads its operand. We don't model
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// it correctly, so just conservatively remove all entries.
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if (isa<VAArgInst>(I)) {
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KillLocs.clear();
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continue;
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}
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// If this is a non-store instruction, it makes everything referenced no
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// longer killed. Remove anything aliased from the alias set tracker.
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KillLocs.remove(I);
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