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4781d8ee1c
Fixes PR13371: indvars pass incorrectly substitutes 'undef' values. I do not like this fix. It's needed until/unless the meaning of undef changes. It attempts to be complete according to the IR spec, but I don't have much confidence in the implementation given the difficulty testing undefined behavior. Worse, this invalidates some of my hard-fought work on indvars and LSR to optimize pointer induction variables. It results benchmark regressions, which I'll track internally. On x86_64 no LTO I see: -3% huffbench -3% 400.perlbench -8% fhourstones My only suggestion for recovering is to change the meaning of undef. If we could trust an arbitrary instruction to produce a some real value that can be manipulated (e.g. incremented) according to non-undef rules, then this case could be easily handled with SCEV. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160421 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| .. | ||
| 2002-09-09-PointerIndVar.ll | ||
| 2003-04-16-ExprAnalysis.ll | ||
| 2003-09-23-NotAtTop.ll | ||
| 2003-12-10-RemoveInstrCrash.ll | ||
| 2003-12-15-Crash.ll | ||
| 2004-03-10-PHIInsertionBug.ll | ||
| 2004-04-05-InvokeCastCrash.ll | ||
| 2004-04-07-ScalarEvolutionCrash.ll | ||
| 2005-02-11-InvokeCrash.ll | ||
| 2005-02-17-TruncateExprCrash.ll | ||
| 2005-02-26-ExitValueCompute.ll | ||
| 2005-06-15-InstMoveCrash.ll | ||
| 2005-11-18-Crash.ll | ||
| 2006-03-31-NegativeStride.ll | ||
| 2006-06-16-Indvar-LCSSA-Crash.ll | ||
| 2006-09-20-LFTR-Crash.ll | ||
| 2006-12-10-BitCast.ll | ||
| 2007-01-06-TripCount.ll | ||
| 2007-06-06-DeleteDanglesPtr.ll | ||
| 2007-11-23-BitcastCrash.ll | ||
| 2008-06-15-SCEVExpanderBug.ll | ||
| 2008-09-02-IVType.ll | ||
| 2008-10-03-CouldNotCompute.ll | ||
| 2008-11-25-APFloatAssert.ll | ||
| 2009-04-14-shorten_iv_vars.ll | ||
| 2009-04-15-shorten-iv-vars-2.ll | ||
| 2009-04-22-IndvarCrash.ll | ||
| 2009-04-27-Floating.ll | ||
| 2009-05-24-useafterfree.ll | ||
| 2011-09-10-widen-nsw.ll | ||
| 2011-09-19-vectoriv.ll | ||
| 2011-09-27-hoistsext.ll | ||
| 2011-10-27-lftrnull.ll | ||
| 2011-11-01-lftrptr.ll | ||
| 2011-11-15-multiexit.ll | ||
| 2011-11-17-selfphi.ll | ||
| 2012-07-17-lftr-undef.ll | ||
| ada-loops.ll | ||
| ashr-tripcount.ll | ||
| avoid-i0.ll | ||
| casted-argument.ll | ||
| crash.ll | ||
| dangling-use.ll | ||
| divide-pointer.ll | ||
| elim-extend.ll | ||
| eliminate-comparison.ll | ||
| eliminate-max.ll | ||
| eliminate-rem.ll | ||
| exit_value_tests.ll | ||
| floating-point-iv.ll | ||
| indirectbr.ll | ||
| interesting-invoke-use.ll | ||
| iterationCount_zext_or_trunc.ll | ||
| iv-fold.ll | ||
| iv-sext.ll | ||
| iv-zext.ll | ||
| lftr_simple.ll | ||
| lftr-other-uses.ll | ||
| lftr-promote.ll | ||
| lftr-reuse.ll | ||
| lit.local.cfg | ||
| loop_evaluate7.ll | ||
| loop_evaluate8.ll | ||
| loop_evaluate9.ll | ||
| loop_evaluate10.ll | ||
| loop_evaluate11.ll | ||
| loop_evaluate_1.ll | ||
| loop_evaluate_2.ll | ||
| loop_evaluate_3.ll | ||
| loop_evaluate_4.ll | ||
| loop_evaluate_5.ll | ||
| loop_evaluate_6.ll | ||
| masked-iv.ll | ||
| no-iv-rewrite.ll | ||
| phi-uses-value-multiple-times.ll | ||
| polynomial-expand.ll | ||
| preserve-signed-wrap.ll | ||
| promote-iv-to-eliminate-casts.ll | ||
| shrunk-constant.ll | ||
| signed-trip-count.ll | ||
| single-element-range.ll | ||
| sink-alloca.ll | ||
| sink-trapping.ll | ||
| tripcount_compute.ll | ||
| tripcount_infinite.ll | ||
| udiv.ll | ||
| uglygep.ll | ||
| ult-sub-to-eq.ll | ||
| variable-stride-ivs-0.ll | ||
| variable-stride-ivs-1.ll | ||