Sanjoy Das c6887c7e27 [SCEV] Fix PR26207 ...

In some cases, the max backedge taken count can be more conservative
than the exact backedge taken count (for instance, because
ScalarEvolution::getRange is not control-flow sensitive whereas
computeExitLimitFromICmp can be).  In these cases,
computeExitLimitFromCond (specifically the bit that deals with `and` and
`or` instructions) can create an ExitLimit instance with a
`SCEVCouldNotCompute` max backedge count expression, but a computable
exact backedge count expression.  This violates an implicit SCEV
assumption: a computable exact BE count should imply a computable max BE
count.

This change

 - Makes the above implicit invariant explicit by adding an assert to
   ExitLimit's constructor

 - Changes `computeExitLimitFromCond` to be more robust around
   conservative max backedge counts

llvm-svn: 258184

2016-01-19 20:53:51 +00:00

..

NVPTX

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

2002-09-09-PointerIndVar.ll

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2003-04-16-ExprAnalysis.ll

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2003-09-23-NotAtTop.ll

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2003-12-10-RemoveInstrCrash.ll

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2003-12-15-Crash.ll

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2004-03-10-PHIInsertionBug.ll

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2004-04-05-InvokeCastCrash.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

2004-04-07-ScalarEvolutionCrash.ll

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2005-02-11-InvokeCrash.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

2005-02-17-TruncateExprCrash.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

2005-02-26-ExitValueCompute.ll

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2005-06-15-InstMoveCrash.ll

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2005-11-18-Crash.ll

[opaque pointer type] Add textual IR support for explicit type parameter to gep operator

2015-03-13 18:20:45 +00:00

2006-03-31-NegativeStride.ll

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2006-06-16-Indvar-LCSSA-Crash.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2006-09-20-LFTR-Crash.ll

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2006-12-10-BitCast.ll

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2007-01-06-TripCount.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2007-06-06-DeleteDanglesPtr.ll

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2007-11-23-BitcastCrash.ll

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2008-06-15-SCEVExpanderBug.ll

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2008-09-02-IVType.ll

Make DataLayout Non-Optional in the Module

2015-03-04 18:43:29 +00:00

2008-10-03-CouldNotCompute.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2008-11-25-APFloatAssert.ll

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2009-04-14-shorten_iv_vars.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2009-04-15-shorten-iv-vars-2.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2009-04-22-IndvarCrash.ll

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2009-04-27-Floating.ll

Make DataLayout Non-Optional in the Module

2015-03-04 18:43:29 +00:00

2009-05-24-useafterfree.ll

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2011-09-10-widen-nsw.ll

This patch teaches IndVarSimplify to add nuw and nsw to certain kinds

2015-01-06 19:02:56 +00:00

2011-09-19-vectoriv.ll

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2011-09-27-hoistsext.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2011-10-27-lftrnull.ll

[opaque pointer type] Add textual IR support for explicit type parameter to gep operator

2015-03-13 18:20:45 +00:00

2011-11-01-lftrptr.ll

Verifier: Call verifyModule() from llc and opt

2015-03-27 22:04:28 +00:00

2011-11-15-multiexit.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2011-11-17-selfphi.ll

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2012-07-17-lftr-undef.ll

[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction

2015-04-16 23:24:18 +00:00

2012-10-19-congruent-constant.ll

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2014-06-21-congruent-constant.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

ada-loops.ll

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

ashr-tripcount.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

avoid-i0.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

backedge-on-min-max.ll

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

bec-cmp.ll

Make ScalarEvolution::isKnownPredicate a little smarter

2015-08-19 01:51:51 +00:00

casted-argument.ll

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

const_phi.ll

Fix PR25372 - teach replaceCongruentPHIs to handle cases where SE evaluates a PHI to a SCEVConstant

2015-11-03 16:27:04 +00:00

crash.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

dangling-use.ll

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

divide-pointer.ll

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dont-recompute.ll

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elim-extend.ll

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

eliminate-comparison.ll

Re-apply r251050 with a for PR25421

2015-11-05 23:45:38 +00:00

eliminate-max.ll

[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction

2015-04-16 23:24:18 +00:00

eliminate-rem.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

exit_value_test2.ll

Enable exitValue rewrite only when the cost of expansion is low.

2015-05-28 21:49:07 +00:00

exit_value_test3.ll

Enable exitValue rewrite only when the cost of expansion is low.

2015-05-28 21:49:07 +00:00

exit_value_tests.ll

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floating-point-iv.ll

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indirectbr.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

interesting-invoke-use.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

iterationCount_zext_or_trunc.ll

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iv-fold.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

iv-sext.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

iv-widen.ll

[IndVars] Have cloneArithmeticIVUser guess better

2015-10-16 01:00:47 +00:00

iv-zext.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

lcssa-preservation.ll

Enable exitValue rewrite only when the cost of expansion is low.

2015-05-28 21:49:07 +00:00

lftr_simple.ll

Make DataLayout Non-Optional in the Module

2015-03-04 18:43:29 +00:00

lftr-address-space-pointers.ll

Revert some changes that were made to fix PR20680.

2015-03-02 21:41:07 +00:00

lftr-extend-const.ll

Make DataLayout Non-Optional in the Module

2015-03-04 18:43:29 +00:00

lftr-other-uses.ll

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lftr-promote.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

lftr-reuse.ll

Revert some changes that were made to fix PR20680.

2015-03-02 21:41:07 +00:00

lftr-udiv-tripcount.ll

[SCEV] Strengthen SCEVExpander::isHighCostExpansion.

2015-04-14 03:20:32 +00:00

lftr-zext.ll

[opaque pointer type] Add textual IR support for explicit type parameter to gep operator

2015-03-13 18:20:45 +00:00

loop_evaluate7.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

loop_evaluate8.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

loop_evaluate9.ll

[opaque pointer type] Add textual IR support for explicit type parameter to gep operator

2015-03-13 18:20:45 +00:00

loop_evaluate10.ll

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loop_evaluate11.ll

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loop_evaluate_1.ll

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loop_evaluate_2.ll

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loop_evaluate_3.ll

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loop_evaluate_4.ll

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loop_evaluate_5.ll

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loop_evaluate_6.ll

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loop-invariant-conditions.ll

[IndVars] Make loop varying predicates loop invariant.

2015-07-27 21:42:49 +00:00

lrev-existing-umin.ll

[IndVars] Try to use existing values in RewriteLoopExitValues.

2015-07-09 18:46:12 +00:00

masked-iv.ll

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

no-iv-rewrite.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

overflowcheck.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

phi-uses-value-multiple-times.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

polynomial-expand.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

pr18223.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

pr20680.ll

Make DataLayout Non-Optional in the Module

2015-03-04 18:43:29 +00:00

pr22222.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

pr24356.ll

[IndVars] Fix PR24356.

2015-08-06 20:43:41 +00:00

pr24783.ll

[IndVars] Fix PR24783.

2015-09-15 23:45:39 +00:00

pr24804.ll

[SCEVExpander] Have hoistIVInc preserve LCSSA

2015-12-08 00:13:17 +00:00

pr24952.ll

[SCEV] identical instructions don't compute equal values

2015-09-27 21:09:48 +00:00

pr24956.ll

[SCEV] Don't crash on pointer comparisons

2015-09-28 21:14:32 +00:00

pr25047.ll

[IndVars] Preserve LCSSA in eliminateIdentitySCEV

2015-10-07 17:38:31 +00:00

pr25051.ll

[IndVars] Don't break dominance in eliminateIdentitySCEV

2015-10-06 21:44:49 +00:00

pr25060.ll

[SCEV] Pick backedge values for phi nodes correctly

2015-10-08 18:28:36 +00:00

pr25360.ll

[SCEV] Don't create SCEV expressions that break LCSSA

2015-10-31 23:21:40 +00:00

pr25421.ll

Re-apply r251050 with a for PR25421

2015-11-05 23:45:38 +00:00

pr25576.ll

[IndVars] Fix PR25576

2016-01-17 18:12:52 +00:00

pr25578.ll

[IndVars] Have getInsertPointForUses preserve LCSSA

2015-12-08 00:13:21 +00:00

pr26207.ll

[SCEV] Fix PR26207

2016-01-19 20:53:51 +00:00

preserve-signed-wrap.ll

Make DataLayout Non-Optional in the Module

2015-03-04 18:43:29 +00:00

promote-iv-to-eliminate-casts.ll

Make DataLayout Non-Optional in the Module

2015-03-04 18:43:29 +00:00

sharpen-range.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

shrunk-constant.ll

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signed-trip-count.ll

Make DataLayout Non-Optional in the Module

2015-03-04 18:43:29 +00:00

single-element-range.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

sink-alloca.ll

[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction

2015-04-16 23:24:18 +00:00

sink-trapping.ll

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strengthen-overflow.ll

Fix PR22222

2015-01-15 01:46:09 +00:00

tripcount_compute.ll

Fix PR18449: SCEV needs more precise max BECount for multi-exit loop.

2014-01-15 06:42:11 +00:00

tripcount_infinite.ll

FileCheck'ify some wc/grep based tests; NFCI.

2015-07-28 03:50:09 +00:00

udiv-invariant-but-traps.ll

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udiv.ll

[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction

2015-04-16 23:24:18 +00:00

uglygep.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

ult-sub-to-eq.ll

Make DataLayout Non-Optional in the Module

2015-03-04 18:43:29 +00:00

use-range-metadata.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

variable-stride-ivs-0.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

variable-stride-ivs-1.ll

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verify-scev.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

widen-loop-comp.ll

[IndVars] Fix a bug in r248045.

2015-09-20 01:52:18 +00:00

widen-nsw.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

zext-nuw.ll

ScalarEvolution: do not set nuw when creating exprs of form <expr> + <all-ones>.

2015-11-20 01:26:13 +00:00