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Simplify.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72965 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2009-06-05 22:39:21 +00:00
parent 578efa920a
commit da634298fc
1 changed files with 5 additions and 15 deletions
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20
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -2425,24 +2425,14 @@ void LoopStrengthReduce::OptimizeLoopCountIV(Loop *L) {
// Get the terminating condition for the loop if possible (this isn't
// necessarily in the latch, or a block that's a predecessor of the header).
SmallVector<BasicBlock*, 8> ExitBlocks;
L->getExitBlocks(ExitBlocks);
if (ExitBlocks.size() != 1) return;
if (!L->getExitBlock())
return; // More than one loop exit blocks.
// Okay, there is one exit block. Try to find the condition that causes the
// loop to be exited.
BasicBlock *ExitBlock = ExitBlocks[0];
BasicBlock *ExitingBlock = 0;
for (pred_iterator PI = pred_begin(ExitBlock), E = pred_end(ExitBlock);
PI != E; ++PI)
if (L->contains(*PI)) {
if (ExitingBlock == 0)
ExitingBlock = *PI;
else
return; // More than one block exiting!
}
assert(ExitingBlock && "No exits from loop, something is broken!");
BasicBlock *ExitingBlock = L->getExitingBlock();
if (!ExitingBlock)
return; // More than one block exiting!
// Okay, we've computed the exiting block. See what condition causes us to
// exit.