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SimplifyCFG: don't turn volatile stores to null/undef into unreachable. Fixes PR7369.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105914 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2010-06-13 14:35:54 +00:00
parent 31135c0692
commit c05cb8d561
1 changed files with 3 additions and 0 deletions
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3
lib/Transforms/Scalar/SimplifyCFGPass.cpp
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@ -137,6 +137,9 @@ static bool MarkAliveBlocks(BasicBlock *BB,
// they should be changed to unreachable by passes that can't modify the
// CFG.
if (StoreInst *SI = dyn_cast<StoreInst>(BBI)) {
// Don't touch volatile stores.
if (SI->isVolatile()) continue;
Value *Ptr = SI->getOperand(1);
if (isa<UndefValue>(Ptr) ||