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Comment and clarifying assert.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139036 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-09-02 21:20:46 +00:00
parent 271439053d
commit 252ef7a61a
2 changed files with 4 additions and 2 deletions
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5
include/llvm/Analysis/ScalarEvolution.h
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@ -319,8 +319,9 @@ namespace llvm {
const SCEV *getExact(ScalarEvolution *SE) const;
/// getExact - Return the number of times this loop exit may fall through
/// to the back edge. The loop is guaranteed not to exit via this block
/// before this number of iterations, but may exit via another block.
/// to the back edge, or SCEVCouldNotCompute. The loop is guaranteed not
/// to exit via this block before this number of iterations, but may exit
/// via another block.
const SCEV *getExact(BasicBlock *ExitingBlock, ScalarEvolution *SE) const;
/// getMax - Get the max backedge taken count for the loop.

1
lib/Analysis/ScalarEvolution.cpp
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@ -4090,6 +4090,7 @@ ScalarEvolution::BackedgeTakenInfo::getExact(ScalarEvolution *SE) const {
else
BECount = SE->getUMinFromMismatchedTypes(BECount, ENT->ExactNotTaken);
}
assert(BECount && "Invalid not taken count for loop exit");
return BECount;
}