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Avoid calling getUniqueExitBlocks from within LoopSimplify, as it depends

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on loops having dedicated exits, which LoopSimplify can no longer always
guarantee.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86181 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-11-05 21:48:32 +00:00
parent 32cc5f47fa
commit b1dc915a8d
1 changed files with 8 additions and 1 deletions
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9
lib/Transforms/Utils/LoopSimplify.cpp
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@ -241,7 +241,14 @@ ReprocessLoop:
// loop-invariant instructions out of the way to open up more
// opportunities, and the disadvantage of having the responsibility
// to preserve dominator information.
if (ExitBlocks.size() > 1 && L->getUniqueExitBlock()) {
bool UniqueExit = true;
if (!ExitBlocks.empty())
for (unsigned i = 1, e = ExitBlocks.size(); i != e; ++i)
if (ExitBlocks[i] != ExitBlocks[0]) {
UniqueExit = false;
break;
}
if (UniqueExit) {
SmallVector<BasicBlock*, 8> ExitingBlocks;
L->getExitingBlocks(ExitingBlocks);
for (unsigned i = 0, e = ExitingBlocks.size(); i != e; ++i) {