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In case of loops with multiple exit where all-but-one exit are deoptimizing it might happen that the first rotation will end up with latch having a deoptimizing exit. This makes the loop unsuitable for trip-count analysis (say, getLoopEstimatedTripCount) as well as for loop transformations that know how to handle multple deoptimizing exits. It pretty much means that canonical form in multple-deoptimizing-exits case should be with non-deoptimizing exit at latch. Teach loop-rotation to reach this canonical form by repeating rotation. -loop-rotate-multi option introduced to control this behavior, currently disabled by default. Reviewers: skatkov, asbirlea, reames, fhahn Reviewed By: skatkov Tags: #llvm Differential Revision: https://reviews.llvm.org/D73058 |
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| .. | ||
| 2009-01-25-SingleEntryPhi.ll | ||
| alloca.ll | ||
| basic.ll | ||
| callbr.ll | ||
| catchret.ll | ||
| convergent.ll | ||
| crash.ll | ||
| dbg-value-duplicates-2.ll | ||
| dbg-value-duplicates.ll | ||
| dbgvalue.ll | ||
| indirectbr.ll | ||
| loopexitinglatch.ll | ||
| multiple-deopt-exits.ll | ||
| multiple-exits.ll | ||
| nosimplifylatch.ll | ||
| oz-disable.ll | ||
| phi-dbgvalue.ll | ||
| phi-duplicate.ll | ||
| PhiRename-1.ll | ||
| PhiSelfReference-1.ll | ||
| pr2639.ll | ||
| pr22337.ll | ||
| pr33701.ll | ||
| pr35210.ll | ||
| pr37205.ll | ||
| preserve-loop-simplify.ll | ||
| preserve-mssa.ll | ||
| preserve-scev.ll | ||
| simplifylatch.ll | ||
| switch.ll | ||
| vect.omp.persistence.ll | ||