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Fix PR2967 by not deleting volatile load/stores that occur before unreachable.

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I don't really see this as being needed, but there is little harm from doing
it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58385 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-10-29 17:46:26 +00:00
parent 90e619afbe
commit f8131c99de
2 changed files with 30 additions and 0 deletions
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11
lib/Transforms/Utils/SimplifyCFG.cpp
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@@ -1932,7 +1932,18 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
while (Unreachable != BB->begin()) {
BasicBlock::iterator BBI = Unreachable;
--BBI;
// Do not delete instructions that can have side effects, like calls
// (which may never return) and volatile loads and stores.
if (isa<CallInst>(BBI)) break;
if (StoreInst *SI = dyn_cast<StoreInst>(BBI))
if (SI->isVolatile())
break;
if (LoadInst *LI = dyn_cast<LoadInst>(BBI))
if (LI->isVolatile())
break;
// Delete this instruction
BB->getInstList().erase(BBI);
Changed = true;