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Updated comments as suggested by Rafael. Thanks.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211268 91177308-0d34-0410-b5e6-96231b3b80d8
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Dinesh Dwivedi 2014-06-19 14:11:53 +00:00
parent 85386a3de9
commit dc9bdcc2cb
1 changed files with 7 additions and 1 deletions
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8
lib/Transforms/Scalar/JumpThreading.cpp
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@ -158,7 +158,13 @@ bool JumpThreading::runOnFunction(Function &F) {
TLI = &getAnalysis<TargetLibraryInfo>();
LVI = &getAnalysis<LazyValueInfo>();
// Remove unreachable blocks from function as they may result in infinite loop.
// Remove unreachable blocks from function as they may result in infinite
// loop. We do threading if we found something profitable. Jump threading a
// branch can create other opportunities. If these opportunities form a cycle
// i.e. if any jump treading is undoing previous threading in the path, then
// we will loop forever. We take care of this issue by not jump threading for
// back edges. This works for normal cases but not for unreachable blocks as
// they may have cycle with no back edge.
removeUnreachableBlocks(F);
FindLoopHeaders(F);