llvm-project/llvm/test/Transforms/IndVarSimplify
Max Kazantsev 541f824d32 [IndVars] Strengthen restricton in rewriteLoopExitValues
For some unclear reason rewriteLoopExitValues considers recalculation
after the loop profitable if it has some "soft uses" outside the loop (i.e. any
use other than call and return), even if we have proved that it has a user inside
the loop which we think will not be optimized away.

There is no existing unit test that would explain this. This patch provides an
example when rematerialisation of exit value is not profitable but it passes
this check due to presence of a "soft use" outside the loop.

It makes no sense to recalculate value on exit if we are going to compute it
due to some irremovable within the loop. This patch disallows applying this
transform in the described situation.

Differential Revision: https://reviews.llvm.org/D51581
Reviewed By: etherzhhb

llvm-svn: 345708
2018-10-31 10:30:50 +00:00
..
AMDGPU AMDGPU: Fix some outdated datalayouts in tests 2018-09-13 11:56:28 +00:00
NVPTX
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 [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
2005-06-15-InstMoveCrash.ll
2005-11-18-Crash.ll
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
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
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
2009-05-24-useafterfree.ll
2011-09-10-widen-nsw.ll Revert "[SCEV] Add nuw/nsw to mul ops in StrengthenNoWrapFlags" 2018-06-19 04:09:44 +00:00
2011-09-19-vectoriv.ll
2011-09-27-hoistsext.ll
2011-10-27-lftrnull.ll ConstantFold: Fold getelementptr (i32, i32* null, i64 undef) to null. 2017-05-08 17:37:29 +00:00
2011-11-01-lftrptr.ll opt: Rename -default-data-layout flag to -data-layout and make it always override the layout. 2017-02-17 17:36:52 +00:00
2011-11-15-multiexit.ll
2011-11-17-selfphi.ll
2012-07-17-lftr-undef.ll
2012-10-19-congruent-constant.ll
2014-06-21-congruent-constant.ll
ada-loops.ll [SimplifyIndVars] Eliminate redundant truncs 2018-06-19 04:48:34 +00:00
ashr-tripcount.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
avoid-i0.ll
backedge-on-min-max.ll [PM] Port IndVarSimplify to the new pass manager 2016-06-05 18:01:19 +00:00
bec-cmp.ll
canonicalize-cmp.ll Re-enable "[IndVars] Canonicalize comparisons between non-negative values and indvars" 2017-07-08 17:17:30 +00:00
casted-argument.ll
const_phi.ll
constant-fold.ll [SimplifyIndVar] Do not fail when we constant fold an IV user to ConstantPointerNull 2017-09-29 16:32:12 +00:00
crash.ll
dangling-use.ll [PPC] Remove Darwin support from POWER backend. 2018-08-28 01:18:29 +00:00
divide-pointer.ll
dont-recompute.ll [IndVars] Strengthen restricton in rewriteLoopExitValues 2018-10-31 10:30:50 +00:00
drop-exact.ll [IndVars] Drop "exact" flag from lshr and udiv when substituting their args 2018-10-11 07:22:26 +00:00
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-enable "[IndVars] Canonicalize comparisons between non-negative values and indvars" 2017-07-08 17:17:30 +00:00
eliminate-max.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
eliminate-rem.ll [SimplifyIndvar] Replace the srem used by IV if we can prove both of its operands are non-negative 2017-09-25 17:39:40 +00:00
eliminate-trunc.ll [SimplifyIndVar] Canonicalize comparisons to unsigned while eliminating truncs 2018-07-27 09:43:39 +00:00
exit_value_test2.ll [SCEV/IndVars] Always compute loop exiting values if the backedge count is 0 2017-08-01 22:37:58 +00:00
exit_value_test3.ll
exit_value_tests.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
floating-point-iv.ll
full_widening.ll [NFC] Add test on full IV widening 2018-09-05 10:10:59 +00:00
huge_muls.ll [SCEV] Make MulOpsInlineThreshold lower to avoid excessive compilation time 2017-06-21 07:28:13 +00:00
indirectbr.ll
inner-loop-by-latch-cond.ll [SCEV] Re-land: Fix isKnownPredicate 2018-03-19 06:35:30 +00:00
inner-loop.ll Re-apply [SCEV] Fix isLoopEntryGuardedByCond usage 2018-02-05 05:49:47 +00:00
interesting-invoke-use.ll
iterationCount_zext_or_trunc.ll
iv-fold.ll
iv-sext.ll
iv-widen-elim-ext.ll [SimplifyIndVar] Avoid generating truncate instructions with non-hoisted Laod operand. 2018-09-07 22:41:57 +00:00
iv-widen.ll [SimplifyIndVars] Ignore dead users 2018-06-13 02:25:32 +00:00
iv-zext.ll
lcssa-preservation.ll
lftr-address-space-pointers.ll
lftr-extend-const.ll
lftr-other-uses.ll
lftr-promote.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
lftr-reuse.ll [SimplifyIndVars] Ignore dead users 2018-06-13 02:25:32 +00:00
lftr-udiv-tripcount.ll
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
lftr_disabled.ll [IndVars] Add an option to be able to disable LFTR 2017-06-09 06:11:59 +00:00
lftr_simple.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
loop-invariant-conditions.ll [SimplifyIndVars] Ignore dead users 2018-06-13 02:25:32 +00:00
loop_evaluate7.ll
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 [SCEV] Make exact taken count calculation more optimistic 2018-03-27 07:30:38 +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
lrev-existing-umin.ll
masked-iv.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
no-iv-rewrite.ll [SimplifyIndVars] Ignore dead users 2018-06-13 02:25:32 +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
polynomial-expand.ll
post-inc-range.ll [IndVarSimplify] Teach calculatePostIncRange to take guards into account 2016-10-19 19:43:54 +00:00
pr18223.ll
pr20680.ll
pr22222.ll
pr24356.ll
pr24783.ll
pr24804.ll
pr24952.ll
pr24956.ll
pr25047.ll
pr25051.ll
pr25060.ll
pr25360.ll
pr25421.ll
pr25576.ll
pr25578.ll [SimplifyIndVars] Ignore dead users 2018-06-13 02:25:32 +00:00
pr26207.ll
pr26973.ll
pr26974.ll
pr27133.ll
pr28935.ll [IndVars] Ignore (s|z)exts that don't extend the induction variable 2016-08-13 00:58:31 +00:00
pr32045.ll [ValueTracking] Don't do an unchecked shift in ComputeNumSignBits 2017-02-25 20:30:45 +00:00
pr35406.ll [SCEV] Fix the movement of insertion point in expander. PR35406. 2017-12-15 05:24:42 +00:00
pr38674.ll [IndVars] Fix usage of SCEVExpander to not mess with SCEVConstant. PR38674 2018-09-04 05:01:35 +00:00
pr38855.ll [NFC] Specify test's option to reduce reliance on defaults 2018-09-11 06:34:43 +00:00
preserve-signed-wrap.ll
promote-iv-to-eliminate-casts.ll [SCEV] Prove implications for SCEVUnknown Phis 2018-04-04 05:46:47 +00:00
replace-iv-with-loop-invariant.ll [SimplifyIndVar] Replace IVUsers with loop invariant whenever possible 2017-10-12 02:54:11 +00:00
replace-sdiv-by-udiv.ll [SimplifyIndvar] Replace the sdiv used by IV if we can prove both of its operands are non-negative 2017-03-30 21:56:56 +00:00
replace-srem-by-urem.ll [SimplifyIndVar] Constant fold IV users 2017-09-27 03:11:46 +00:00
rewrite-loop-exit-value.ll
scev-phi-debug-info.ll [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
scevexpander-phi-base-case.ll [ScalarEvolution] Fix base condition in isNormalAddRecPHI. 2017-12-14 14:47:52 +00:00
sharpen-range.ll [PM] Port IndVarSimplify to the new pass manager 2016-06-05 18:01:19 +00:00
shrunk-constant.ll [SCEV] Add [zs]ext{C,+,x} -> (D + [zs]ext{C-D,+,x})<nuw><nsw> transform 2018-07-25 18:01:41 +00:00
signed-trip-count.ll [IndVars] Un-grepify test; NFC 2016-08-03 20:53:23 +00:00
single-element-range.ll
sink-alloca.ll
sink-from-preheader.ll [IndVars] Set Changed if sinkUnusedInvariants changes IR. PR38863 2018-09-10 06:32:00 +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 [IndVarSimplify] Add AShr exact flags using induction variables ranges. 2017-07-05 13:25:58 +00:00
tripcount_compute.ll
tripcount_infinite.ll
udiv-invariant-but-traps.ll
udiv.ll Revert rL316568 because of sudden performance drop on ARM 2017-10-27 04:17:44 +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
variable-stride-ivs-0.ll
variable-stride-ivs-1.ll
verify-scev.ll
widen-loop-comp.ll [SimplifyIndVars] Eliminate redundant truncs 2018-06-19 04:48:34 +00:00
widen-nsw.ll
zext-nuw.ll