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llvm-mirror/test/Transforms/LoopRotate
Chandler Carruth 2817fc1e53 Fix ValueTracking to conclude that debug intrinsics are safe to
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.

llvm-svn: 154263
2012-04-07 19:22:18 +00:00
..
2009-01-25-SingleEntryPhi.ll
alloca.ll loop-rotate shouldn't hoist alloca instructions out of a loop. Patch by Patrik Hägglund, with slightly modified test. Issue reported by Patrik Hägglund on llvmdev. 2012-02-16 00:41:10 +00:00
basic.ll Teach loop rotate to hoist trivially invariant instructions 2010-09-06 01:10:22 +00:00
crash.ll remove asmparser support for the old getresult instruction, which has been subsumed by extractvalue. 2011-06-17 06:57:15 +00:00
dbgvalue.ll Fix ValueTracking to conclude that debug intrinsics are safe to 2012-04-07 19:22:18 +00:00
indirectbr.ll
lit.local.cfg Replace all instances of dg.exp file with lit.local.cfg, since all tests are run with LIT now and now Dejagnu. dg.exp is no longer needed. 2012-02-16 06:28:33 +00:00
phi-duplicate.ll When loop rotation happens, it is *very* common for the duplicated condbr 2011-01-08 19:59:06 +00:00
PhiRename-1.ll Remove support for using "foo" as symbols instead of %"foo". This is ancient 2011-06-17 06:36:20 +00:00
PhiSelfRefernce-1.ll
pr2639.ll
preserve-scev.ll
simplifylatch.ll Add simplifyLoopLatch to LoopRotate pass. 2012-02-14 00:00:23 +00:00