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speculate. Without this, loop rotate (among many other places) would suddenly stop working in the presence of debug info. I found this looking at loop rotate, and have augmented its tests with a reduction out of a very hot loop in yacr2 where failing to do this rotation costs sometimes more than 10% in runtime performance, perturbing numerous downstream optimizations. This should have no impact on performance without debug info, but the change in performance when debug info is enabled can be extreme. As a consequence (and this how I got to this yak) any profiling of performance problems should be treated with deep suspicion -- they may have been wildly innacurate of debug info was enabled for profiling. =/ Just a heads up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154263 91177308-0d34-0410-b5e6-96231b3b80d8 |
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.. | ||
2009-01-25-SingleEntryPhi.ll | ||
alloca.ll | ||
basic.ll | ||
crash.ll | ||
dbgvalue.ll | ||
indirectbr.ll | ||
lit.local.cfg | ||
phi-duplicate.ll | ||
PhiRename-1.ll | ||
PhiSelfRefernce-1.ll | ||
pr2639.ll | ||
preserve-scev.ll | ||
simplifylatch.ll |