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Clarify what we mean by a dead loop.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50406 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-04-29 06:34:55 +00:00
parent 00487995ea
commit 5f8b344255
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/Scalar/DeadLoopElimination.cpp
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@ -126,6 +126,10 @@ bool DeadLoopElimination::IsLoopDead(Loop* L) {
return true;
}
/// runOnLoop - Remove dead loops, by which we mean loops that do not impact the
/// observable behavior of the program other than finite running time. Note
/// we do ensure that this never remove a loop that might be infinite, as doing
/// so could change the halting/non-halting nature of a program.
bool DeadLoopElimination::runOnLoop(Loop* L, LPPassManager& LPM) {
// Don't remove loops for which we can't solve the trip count.
// They could be infinite, in which case we'd be changing program behavior.