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Fix a bug where we didn't realize that vaarg reads memory. This fixes

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Transforms/DeadStoreElimination/2005-11-30-vaarg.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24545 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-11-30 19:38:22 +00:00
parent c2c2009e2c
commit 2bd4cb597a
1 changed files with 7 additions and 0 deletions
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7
lib/Transforms/Scalar/DeadStoreElimination.cpp
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@ -96,6 +96,13 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
}
if (!isa<StoreInst>(I) || cast<StoreInst>(I)->isVolatile()) {
// If this is a vaarg instruction, it reads its operand. We don't model
// it correctly, so just conservatively remove all entries.
if (isa<VAArgInst>(I)) {
KillLocs.clear();
continue;
}
// If this is a non-store instruction, it makes everything referenced no
// longer killed. Remove anything aliased from the alias set tracker.
KillLocs.remove(I);