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Simplify.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72970 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2462,24 +2462,15 @@ void ScalarEvolution::forgetLoopPHIs(const Loop *L) {
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ScalarEvolution::BackedgeTakenInfo
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ScalarEvolution::ComputeBackedgeTakenCount(const Loop *L) {
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// If the loop has a non-one exit block count, we can't analyze it.
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SmallVector<BasicBlock*, 8> ExitBlocks;
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L->getExitBlocks(ExitBlocks);
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if (ExitBlocks.size() != 1) return UnknownValue;
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BasicBlock *ExitBlock = L->getExitBlock();
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if (!ExitBlock)
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return UnknownValue;
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// Okay, there is one exit block. Try to find the condition that causes the
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// loop to be exited.
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BasicBlock *ExitBlock = ExitBlocks[0];
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BasicBlock *ExitingBlock = 0;
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for (pred_iterator PI = pred_begin(ExitBlock), E = pred_end(ExitBlock);
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PI != E; ++PI)
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if (L->contains(*PI)) {
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if (ExitingBlock == 0)
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ExitingBlock = *PI;
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else
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return UnknownValue; // More than one block exiting!
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}
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assert(ExitingBlock && "No exits from loop, something is broken!");
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BasicBlock *ExitingBlock = L->getExitingBlock();
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if (!ExitingBlock)
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return UnknownValue; // More than one block exiting!
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// Okay, we've computed the exiting block. See what condition causes us to
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// exit.
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