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llvm-project/llvm/test/Analysis/ScalarEvolution
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Max Kazantsev 7094c8deb2 [SCEV] Make exact taken count calculation more optimistic 
Currently, `getExact` fails if it sees two exit counts in different blocks. There is
no solid reason to do so, given that we only calculate exact non-taken count
for exiting blocks that dominate latch. Using this fact, we can simply take min
out of all exits of all blocks to get the exact taken count.

This patch makes the calculation more optimistic with enforcing our assumption
with asserts. It allows us to calculate exact backedge taken count in trivial loops
like

  for (int i = 0; i < 100; i++) {
    if (i > 50) break;
    . . .
  }

Differential Revision: https://reviews.llvm.org/D44676
Reviewed By: fhahn

llvm-svn: 328611
 		2018-03-27 07:30:38 +00:00
..
2007-07-15-NegativeStride.ll
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2007-08-06-MisinterpretBranch.ll
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2007-08-06-Unsigned.ll
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2007-09-27-LargeStepping.ll
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2007-11-14-SignedAddRec.ll
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2007-11-18-OrInstruction.ll
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2008-02-11-ReversedCondition.ll
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2008-02-12-SMAXTripCount.ll
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2008-02-15-UMax.ll
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2008-05-25-NegativeStepToZero.ll
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2008-06-12-BinomialInt64.ll
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2008-07-12-UnneededSelect1.ll
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2008-07-12-UnneededSelect2.ll
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2008-07-19-InfiniteLoop.ll
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2008-07-19-WrappingIV.ll
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2008-07-29-SGTTripCount.ll
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2008-07-29-SMinExpr.ll
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2008-08-04-IVOverflow.ll
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2008-08-04-LongAddRec.ll
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2008-11-02-QuadraticCrash.ll
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2008-11-15-CubicOOM.ll
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2008-11-18-LessThanOrEqual.ll
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2008-11-18-Stride1.ll
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2008-11-18-Stride2.ll
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2008-12-08-FiniteSGE.ll
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2008-12-11-SMaxOverflow.ll
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2008-12-14-StrideAndSigned.ll
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2008-12-15-DontUseSDiv.ll
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2009-01-02-SignedNegativeStride.ll
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2009-04-22-TruncCast.ll
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2009-05-09-PointerEdgeCount.ll
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2009-07-04-GroupConstantsWidthMismatch.ll
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2010-09-03-RequiredTransitive.ll
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2011-03-09-ExactNoMaxBECount.ll
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2011-04-26-FoldAddRec.ll [PM] Clean up the testing for IVUsers, especially with the new PM. 2017-01-15 09:29:27 +00:00
2011-10-04-ConstEvolve.ll
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2012-03-26-LoadConstant.ll
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2012-05-18-LoopPredRecurse.ll [PM] Clean up the testing for IVUsers, especially with the new PM. 2017-01-15 09:29:27 +00:00
2012-05-29-MulAddRec.ll
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SolveQuadraticEquation.ll
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ZeroStep.ll [SCEV] createAddRecFromPHI: Optimize for the most common case. 2017-05-03 23:53:38 +00:00
and-xor.ll
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avoid-assume-hang.ll
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avoid-infinite-recursion-0.ll
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avoid-infinite-recursion-1.ll [PM] Clean up the testing for IVUsers, especially with the new PM. 2017-01-15 09:29:27 +00:00
avoid-smax-0.ll
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avoid-smax-1.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
cache_loop_exit_limit.ll [SCEV] Re-enable "Cache results of computeExitLimit" 2017-08-03 08:41:30 +00:00
constant_condition.ll
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different-loops-recs.ll [SCEV] Strengthen variance condition in calculateLoopDisposition 2017-11-22 06:21:39 +00:00
div-overflow.ll
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do-loop.ll
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exact_iter_count.ll [SCEV] Make exact taken count calculation more optimistic 2018-03-27 07:30:38 +00:00
exhaustive-trip-counts.ll
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expander-replace-congruent-ivs.ll
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exponential-behavior.ll [SCEV] Fix exponential time complexity by caching 2017-04-24 00:09:46 +00:00
ext-antecedent.ll
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flags-from-poison-dbg.ll
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flags-from-poison.ll [SCEV] Preserve NSW information for sext(subtract). 2017-08-04 20:19:46 +00:00
flattened-0.ll [SCEV] Add URem support to SCEV 2017-09-01 14:59:59 +00:00
fold.ll
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guards.ll Re-enable "[IndVars] Canonicalize comparisons between non-negative values and indvars" 2017-07-08 17:17:30 +00:00
how-far-to-zero.ll
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implied-via-addition.ll [ScalarEvolution] Re-enable Predicate implication from operations 2017-03-31 12:05:30 +00:00
implied-via-division.ll [ScalarEvolution] Re-enable Predicate implication from operations 2017-03-31 12:05:30 +00:00
incorrect-nsw.ll
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increasing-or-decreasing-iv.ll
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infer-prestart-no-wrap.ll
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infer-via-ranges.ll
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inner-loop-by-latch-cond-unknown.ll [SCEV] Re-land: Fix isKnownPredicate 2018-03-19 06:35:30 +00:00
invalidation.ll [PM] The assumption cache is fundamentally designed to be self-updating, 2017-01-15 00:26:18 +00:00
latch-dominating-conditions.ll
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limit-depth.ll [SCEV] Use depth limit instead of local cache for SExt and ZExt 2017-06-30 05:04:09 +00:00
load-with-range-metadata.ll
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load.ll
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max-addops-inline.ll [SCEV] Introduce add operation inlining limit 2017-01-26 13:33:17 +00:00
max-addrec-size.ll [SCEV] Limit max size of AddRecExpr during evolving 2017-07-23 15:40:19 +00:00
max-be-count-not-constant.ll [SCEV] Fix an assertion failure in the max backedge taken count 2017-10-25 21:41:00 +00:00
max-mulops-inline.ll
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max-trip-count-address-space.ll
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max-trip-count.ll [SCEV] Make exact taken count calculation more optimistic 2018-03-27 07:30:38 +00:00
min-max-exprs.ll
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no-wrap-add-exprs.ll
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no-wrap-unknown-becount.ll
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non-IV-phi.ll
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nowrap-preinc-limits.ll
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nsw-offset-assume.ll
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nsw-offset.ll
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nsw.ll [SCEV] Clarify behavior around max backedge taken count 2017-05-22 06:46:04 +00:00
nw-sub-is-not-nw-add.ll
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overflow-intrinsics.ll
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pointer-sign-bits.ll
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pr3909.ll
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pr18606-min-zeros.ll [SCEV] Cache results during GetMinTrailingZeros query 2017-02-14 15:53:12 +00:00
pr18606.ll
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pr22179.ll
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pr22641.ll
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pr22674.ll
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pr22856.ll
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pr24757.ll [SCEV] Make getUDivExactExpr handle non-nuw multiplies correctly. 2017-01-18 23:56:42 +00:00
pr25369.ll
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pr27315.ll
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pr28705.ll
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pr34538.ll [SCEV] Handling for ICmp occuring in the evolution chain. 2017-11-13 16:43:24 +00:00
pr35890.ll [SCEV] Make getPostIncExpr guaranteed to return AddRec 2018-02-12 05:09:38 +00:00
predicated-trip-count.ll
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range-signedness.ll
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returned.ll
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scev-aa.ll
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scev-canonical-mode.ll
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scev-dispositions.ll
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scev-expander-existing-value-offset.ll
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scev-expander-incorrect-nowrap.ll
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scev-expander-reuse-gep.ll
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scev-expander-reuse-unroll.ll
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scev-expander-reuse-vect.ll
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scev-invalid.ll
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scev-prestart-nowrap.ll
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sext-inreg.ll [SCEV] Simplify/generalize howFarToZero solving. 2017-01-31 00:42:42 +00:00
sext-iv-0.ll
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sext-iv-1.ll
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sext-iv-2.ll
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sext-mul.ll Model ashr(shl(x, n), m) as mul(x, 2^(n-m)) when n > m 2017-03-23 18:06:09 +00:00
sext-to-zext.ll
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sext-zero.ll Model ashr(shl(x, n), m) as mul(x, 2^(n-m)) when n > m 2017-03-23 18:06:09 +00:00
shift-op.ll [SCEV] Fix predicate usage in computeExitLimitFromICmp 2017-12-08 12:19:45 +00:00
sle.ll
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smax-br-phi-idioms.ll
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smax.ll
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trip-count-pow2.ll [SCEV] Clarify behavior around max backedge taken count 2017-05-22 06:46:04 +00:00
trip-count-switch.ll
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trip-count-unknown-stride.ll
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trip-count.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
trip-count2.ll
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trip-count3.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
trip-count4.ll
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trip-count5.ll
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trip-count6.ll
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trip-count7.ll
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trip-count8.ll
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trip-count9.ll
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trip-count10.ll
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trip-count11.ll
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trip-count12.ll
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trip-count13.ll
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trip-count14.ll [SCEV] Make exact taken count calculation more optimistic 2018-03-27 07:30:38 +00:00
tripmultiple_calculation.ll [SCEV] Fix trip multiple calculation 2017-03-20 20:25:46 +00:00
truncate.ll [SCEV] Do not insert if it is already in cache 2017-12-27 07:15:23 +00:00
undefined.ll
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unknown_phis.ll [SCEV] Smart range calculation for SCEVUnknown Phis 2018-03-01 06:56:48 +00:00
unreachable-code.ll
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unsimplified-loop.ll
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urem-0.ll [SCEV] Add URem support to SCEV 2017-09-01 14:59:59 +00:00
zext-signed-addrec.ll
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zext-wrap.ll [SCEV] Compute affine range in another way to avoid bitwidth extending. 2017-03-16 21:07:38 +00:00