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llvm/test/Transforms/IndVarSimplify
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Ehsan Amiri f11cae6f49 Extend trip count instead of truncating IV in LFTR, when legal 
When legal, extending trip count in the loop control logic generates better code compared to truncating IV. This is because

(1) extending trip count is a loop invariant operation (see genLoopLimit where we prove trip count is loop invariant).
(2) Scalar Evolution seems to have problems understanding trunc when computing loop trip count. So removing them allows better analysis performed in Scalar Evolution. (In particular this fixes PR 28363 which is the motivation for this change).

I am not going to perform any performance test. Any degradation caused by this should be an indication of a bug elsewhere.

To prove legality, we rely on SCEV to prove zext(trunc(IV)) == IV (or similarly for sext). If this holds, we can prove equivalence of trunc(IV)==ExitCnt (1) and IV == zext(ExitCnt). Simply take zext of boths sides of (1) and apply the proven equivalence.

This commit contains changes in a newly added testcase which was not included in the previous commit (which was reverted later on).

https://reviews.llvm.org/D23075



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278421 91177308-0d34-0410-b5e6-96231b3b80d8
2016-08-11 21:31:40 +00:00
..
AMDGPU AMDGPU: Cost model for basic integer operations 2016-03-25 01:16:40 +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
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 Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
2004-04-07-ScalarEvolutionCrash.ll
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 [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
2005-06-15-InstMoveCrash.ll
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 [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
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
2006-12-10-BitCast.ll
2007-01-06-TripCount.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
2007-06-06-DeleteDanglesPtr.ll
2007-11-23-BitcastCrash.ll
2008-06-15-SCEVExpanderBug.ll
2008-09-02-IVType.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +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
2009-04-14-shorten_iv_vars.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
2009-04-15-shorten-iv-vars-2.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
2009-04-22-IndvarCrash.ll
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
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
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
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
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 [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +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 [PM] Port IndVarSimplify to the new pass manager 2016-06-05 18:01:19 +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
dont-recompute.ll
elim-extend.ll Extend trip count instead of truncating IV in LFTR, when legal 2016-08-11 21:31:40 +00:00
eliminate-comparison.ll Re-apply r251050 with a for PR25421 2015-11-05 23:45:38 +00:00
eliminate-max.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +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 [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
floating-point-iv.ll
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
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-elim-ext.ll Extend trip count instead of truncating IV in LFTR, when legal 2016-08-11 21:31:40 +00:00
iv-widen.ll [PM] Port IndVarSimplify to the new pass manager 2016-06-05 18:01:19 +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 [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
lftr-address-space-pointers.ll [SCEV] Try to reuse existing value during SCEV expansion 2016-02-04 01:27:38 +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
lftr-promote.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +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-wide-trip-count.ll Extend trip count instead of truncating IV in LFTR, when legal 2016-08-11 21:31:40 +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 [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
loop_evaluate9.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
loop_evaluate10.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
loop_evaluate11.ll
loop_evaluate_1.ll
loop_evaluate_2.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
loop_evaluate_3.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
loop_evaluate_4.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
loop_evaluate_5.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
loop_evaluate_6.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
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 [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +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
overflow-intrinsics.ll [IndVars] Eliminate op.with.overflow when possible (re-apply) 2016-05-29 00:36:25 +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 [SCEV] Try to reuse existing value during SCEV expansion 2016-02-04 01:27:38 +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
pr26973.ll [IndVars] Pass the right loop to isLoopInvariantPredicate 2016-03-18 20:37:07 +00:00
pr26974.ll [IndVars] Fix PR26974: make sure replaceCongruentIVs doesn't break LCSSA 2016-03-21 12:44:29 +00:00
pr27133.ll [IndVarSimplify] Don't insert after a catchswitch 2016-03-30 21:12:06 +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 [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
rewrite-loop-exit-value.ll [IndVarSimplify] Rewrite loop exit values with their initial values from loop preheader 2016-01-27 07:40:41 +00:00
sharpen-range.ll [PM] Port IndVarSimplify to the new pass manager 2016-06-05 18:01:19 +00:00
shrunk-constant.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
signed-trip-count.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +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 [LLVM] Remove unwanted --check-prefix=CHECK from unit tests. NFC. 2016-04-19 23:51:52 +00:00
strengthen-overflow.ll Fix PR22222 2015-01-15 01:46:09 +00:00
tripcount_compute.ll
tripcount_infinite.ll FileCheck'ify some wc/grep based tests; NFCI. 2015-07-28 03:50:09 +00:00
udiv-invariant-but-traps.ll
udiv.ll [SCEV] Try to reuse existing value during SCEV expansion 2016-02-04 01:27:38 +00:00
uglygep.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
ult-sub-to-eq.ll Extend trip count instead of truncating IV in LFTR, when legal 2016-08-11 21:31:40 +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
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