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archived-llvm/test/Analysis/ScalarEvolution
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Alexandre Isoard 3b88873b05 [SCEV] Add URem support to SCEV 
In LLVM IR the following code:

    %r = urem <ty> %t, %b

is equivalent to

    %q = udiv <ty> %t, %b
    %s = mul <ty> nuw %q, %b
    %r = sub <ty> nuw %t, %q ; (t / b) * b + (t % b) = t

As UDiv, Mul and Sub are already supported by SCEV, URem can be implemented
with minimal effort using that relation:

    %r --> (-%b * (%t /u %b)) + %t

We implement two special cases:

  - if %b is 1, the result is always 0
  - if %b is a power-of-two, we produce a zext/trunc based expression instead

That is, the following code:

    %r = urem i32 %t, 65536

Produces:

    %r --> (zext i16 (trunc i32 %a to i16) to i32)

Note that while this helps get a tighter bound on the range analysis and the
known-bits analysis, this exposes some normalization shortcoming of SCEVs:

    %div = udim i32 %a, 65536
    %mul = mul i32 %div, 65536
    %rem = urem i32 %a, 65536
    %add = add i32 %mul, %rem

Will usually not be reduced.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312329 91177308-0d34-0410-b5e6-96231b3b80d8
2017-09-01 14:59:59 +00:00
..
2007-07-15-NegativeStride.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
2007-08-06-MisinterpretBranch.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2007-08-06-Unsigned.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2007-09-27-LargeStepping.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2007-11-14-SignedAddRec.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2007-11-18-OrInstruction.ll
…
2008-02-11-ReversedCondition.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2008-02-12-SMAXTripCount.ll
Filecheckize.
2011-11-29 02:05:23 +00:00
2008-02-15-UMax.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2008-05-25-NegativeStepToZero.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2008-06-12-BinomialInt64.ll
…
2008-07-12-UnneededSelect1.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2008-07-12-UnneededSelect2.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2008-07-19-InfiniteLoop.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2008-07-19-WrappingIV.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2008-07-29-SGTTripCount.ll
…
2008-07-29-SMinExpr.ll
…
2008-08-04-IVOverflow.ll
…
2008-08-04-LongAddRec.ll
…
2008-11-02-QuadraticCrash.ll
…
2008-11-15-CubicOOM.ll
…
2008-11-18-LessThanOrEqual.ll
[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction
2015-04-16 23:24:18 +00:00
2008-11-18-Stride1.ll
Rewrite SCEV's backedge taken count computation.
2013-11-06 02:08:26 +00:00
2008-11-18-Stride2.ll
Rewrite SCEV's backedge taken count computation.
2013-11-06 02:08:26 +00:00
2008-12-08-FiniteSGE.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2008-12-11-SMaxOverflow.ll
…
2008-12-14-StrideAndSigned.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
2008-12-15-DontUseSDiv.ll
Rewrite SCEV's backedge taken count computation.
2013-11-06 02:08:26 +00:00
2009-01-02-SignedNegativeStride.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-TruncCast.ll
Actually call FileCheck in tests
2014-02-16 13:27:39 +00:00
2009-05-09-PointerEdgeCount.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
2009-07-04-GroupConstantsWidthMismatch.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
2010-09-03-RequiredTransitive.ll
Add a check to the test Analysis/ScalarEvolution/2010-09-03-RequiredTransitive.ll
2012-12-30 01:42:34 +00:00
2011-03-09-ExactNoMaxBECount.ll
Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID
2012-12-30 02:33:22 +00:00
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
Missing test case for r141164.
2011-10-05 06:23:32 +00:00
2012-03-26-LoadConstant.ll
[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction
2015-04-16 23:24:18 +00:00
2012-05-18-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
Fix broken check lines.
2012-08-17 12:28:26 +00:00
and-xor.ll
Teach SCEV to handle more cases of 'and X, CST', specifically where CST is any number of contiguous 1 bits in a row, with any number of leading and trailing 0 bits.
2014-01-27 10:04:03 +00:00
avoid-assume-hang.ll
ScalarEvolution assume hanging bugfix
2015-09-09 20:47:30 +00:00
avoid-infinite-recursion-0.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
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
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
avoid-smax-1.ll
Revert "Change memcpy/memset/memmove to have dest and source alignments."
2015-11-19 05:56:52 +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
Revert "Revert "This patch builds on top of D13378 to handle constant condition.""
2015-10-07 18:14:25 +00:00
different-loops-recs.ll
Re-enable "[SCEV] Do not fold dominated SCEVUnknown into AddRecExpr start"
2017-05-26 06:47:04 +00:00
div-overflow.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
do-loop.ll
FileCheck-ize tests.
2013-08-22 00:51:19 +00:00
exhaustive-trip-counts.ll
[SCEV] Compute max be count from shift operator only if all else fails
2016-06-30 02:47:28 +00:00
expander-replace-congruent-ivs.ll
[SCEVExpander] Fix a failed cast<> assertion
2016-05-11 17:41:41 +00:00
exponential-behavior.ll
[SCEV] Fix exponential time complexity by caching
2017-04-24 00:09:46 +00:00
ext-antecedent.ll
[SCEV] Revert bailout added in r75511.
2015-03-26 17:28:26 +00:00
flags-from-poison-dbg.ll
Teach isGuarantdToTransferExecToSuccessor about debug info intrinsics
2016-06-08 17:48:36 +00:00
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
When simplifying a SCEV truncate by distributing, consider it a simplification to replace a cast, even if we end up with a trunc around the term. Fixes PR22960!
2015-03-20 02:25:00 +00:00
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
If the step value is a constant zero, the loop isn't going to terminate. Fixes
2012-06-28 23:44:57 +00:00
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
Bugfix: SCEV incorrectly marks certain add recurrences as nsw
2015-02-09 18:34:55 +00:00
increasing-or-decreasing-iv.ll
Remove trailing newline from test case; NFC
2016-03-09 01:51:44 +00:00
infer-prestart-no-wrap.ll
[SCEV] Don't always add no-wrap flags to post-inc add recs
2016-05-29 00:32:17 +00:00
infer-via-ranges.ll
[SCEV] Make isImpliedCond smarter.
2015-03-18 00:41:29 +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
[SCEV] Look at backedge dominating conditions (re-land r233447).
2015-04-01 18:24:06 +00:00
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
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
load.ll
[SCEV] Add a `scalar-evolution-print-constant-ranges' option
2015-03-09 21:43:39 +00:00
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-mulops-inline.ll
[SCEV] Add a threshold to restrict number of mul operands to be inlined into SCEV
2016-10-20 21:38:39 +00:00
max-trip-count-address-space.ll
[SCEV] Add a `scalar-evolution-print-constant-ranges' option
2015-03-09 21:43:39 +00:00
max-trip-count.ll
[SCEV] Make howFarToZero max backedge-taken count check for precondition.
2017-01-11 21:07:15 +00:00
min-max-exprs.ll
[SCEV] Mark AddExprs as nsw or nuw if legal
2015-10-22 19:57:19 +00:00
no-wrap-add-exprs.ll
[SCEV] Commute zero extends through <nuw> additions
2015-10-22 19:57:38 +00:00
no-wrap-unknown-becount.ll
Revert @llvm.assume with operator bundles (r289755-r289757)
2016-12-19 08:22:17 +00:00
non-IV-phi.ll
[SCEV] Generalize the SCEV algorithm for creating expressions for PHI nodes
2015-10-30 15:02:28 +00:00
nowrap-preinc-limits.ll
[SCEV] Don't always add no-wrap flags to post-inc add recs
2016-05-29 00:32:17 +00:00
nsw-offset-assume.ll
Revert @llvm.assume with operator bundles (r289755-r289757)
2016-12-19 08:22:17 +00:00
nsw-offset.ll
[SCEV] No-wrap flags are not propagated when folding "{S,+,X}+T ==> {S+T,+,X}"
2016-05-25 13:01:33 +00:00
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
Make ScalarEvolution less aggressive with respect to no-wrap flags.
2015-01-22 00:48:47 +00:00
overflow-intrinsics.ll
[SCEV] See through op.with.overflow intrinsics (re-apply)
2016-05-29 00:34:42 +00:00
pointer-sign-bits.ll
…
pr3909.ll
Remove support for parsing the "type i32" syntax for defining a numbered
2011-06-19 00:03:46 +00:00
pr18606-min-zeros.ll
[SCEV] Cache results during GetMinTrailingZeros query
2017-02-14 15:53:12 +00:00
pr18606.ll
[SCEV] Memoize visitMulExpr results in SCEVRewriteVisitor.
2016-10-21 20:05:21 +00:00
pr22179.ll
[opaque pointer type] Add textual IR support for explicit type parameter to gep operator
2015-03-13 18:20:45 +00:00
pr22641.ll
Fix bug 22641
2015-02-24 01:02:42 +00:00
pr22674.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
pr22856.ll
[SCEV] Fix PR22856.
2015-03-13 18:31:19 +00:00
pr24757.ll
[SCEV] Make getUDivExactExpr handle non-nuw multiplies correctly.
2017-01-18 23:56:42 +00:00
pr25369.ll
[SCEV] Fix PR25369
2015-11-02 02:06:01 +00:00
pr27315.ll
[SCEV] Don't always add no-wrap flags to post-inc add recs
2016-05-29 00:32:17 +00:00
pr28705.ll
Fix the runtime error caused by "Use ValueOffsetPair to enhance value reuse during SCEV expansion".
2016-08-09 20:40:03 +00:00
predicated-trip-count.ll
Re-commit [SCEV] Introduce a guarded backedge taken count and use it in LAA and LV
2016-04-08 14:29:09 +00:00
range-signedness.ll
[SCEV] Unify getUnsignedRange and getSignedRange
2015-03-09 21:43:43 +00:00
returned.ll
Teach SCEV to look through returned-argument functions
2016-07-11 02:48:23 +00:00
scev-aa.ll
[PM/AA] Wire up SCEVAA to the new pass manager's registry and test it.
2016-02-20 04:01:45 +00:00
scev-canonical-mode.ll
This patch is to fix PR26529 caused by r259736.
2016-02-09 00:07:08 +00:00
scev-dispositions.ll
[SCEV] Tweak the output format and content of -analyze
2016-05-03 17:49:57 +00:00
scev-expander-existing-value-offset.ll
Recommit "Use ValueOffsetPair to enhance value reuse during SCEV expansion".
2016-08-09 20:37:50 +00:00
scev-expander-incorrect-nowrap.ll
Bugfix: SCEVExpander incorrectly marks increment operations as no-wrap
2015-02-25 20:02:59 +00:00
scev-expander-reuse-gep.ll
Create a getelementptr instead of sub expr for ValueOffsetPair if the
2016-09-14 04:39:50 +00:00
scev-expander-reuse-unroll.ll
[UNROLL] Postpone ScalarEvolution::forgetLoop after TripCountSC is expanded
2016-08-25 16:17:18 +00:00
scev-expander-reuse-vect.ll
[UNROLL] Postpone ScalarEvolution::forgetLoop after TripCountSC is expanded
2016-08-25 16:17:18 +00:00
scev-invalid.ll
Fix SCEV forgetMemoizedResults should search and destroy backedge exprs.
2013-03-26 03:14:53 +00:00
scev-prestart-nowrap.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
sext-inreg.ll
[SCEV] Simplify/generalize howFarToZero solving.
2017-01-31 00:42:42 +00:00
sext-iv-0.ll
[SCEV] Add a `scalar-evolution-print-constant-ranges' option
2015-03-09 21:43:39 +00:00
sext-iv-1.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
sext-iv-2.ll
[opaque pointer type] Add textual IR support for explicit type parameter to gep operator
2015-03-13 18:20:45 +00:00
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
[SCEV] Be less eager about demoting zexts to sexts
2016-03-03 18:31:23 +00:00
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] Compute max backedge count for loops with "shift ivs"
2015-10-28 21:27:14 +00:00
sle.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
smax-br-phi-idioms.ll
[SCEV] Don't infinitely recurse on unreachable code
2016-08-05 18:34:14 +00:00
smax.ll
FileCheckize some of the testcases.
2013-08-05 23:43:18 +00:00
SolveQuadraticEquation.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
trip-count2.ll
[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction
2015-02-27 19:29:02 +00:00
trip-count3.ll
Revert "Change memcpy/memset/memmove to have dest and source alignments."
2015-11-19 05:56:52 +00:00
trip-count4.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
trip-count5.ll
[SCEV] Un-grep'ify tests; NFC
2016-08-05 20:33:49 +00:00
trip-count6.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
trip-count7.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
trip-count8.ll
FileCheckize some of the testcases.
2013-08-05 23:43:18 +00:00
trip-count9.ll
Rewrite SCEV's backedge taken count computation.
2013-11-06 02:08:26 +00:00
trip-count10.ll
Unit test for SCEV fix r182989, PR16130.
2013-05-31 16:42:41 +00:00
trip-count11.ll
[SCEV] Add a `scalar-evolution-print-constant-ranges' option
2015-03-09 21:43:39 +00:00
trip-count12.ll
[opaque pointer type] Add textual IR support for explicit type parameter to load instruction
2015-02-27 21:17:42 +00:00
trip-count13.ll
[LoopUnroll] Keep the loop test only on the first iteration of max-or-zero loops
2016-10-21 11:08:48 +00:00
trip-count14.ll
[LoopUnroll] Keep the loop test only on the first iteration of max-or-zero loops
2016-10-21 11:08:48 +00:00
trip-count-pow2.ll
[SCEV] Clarify behavior around max backedge taken count
2017-05-22 06:46:04 +00:00
trip-count-switch.ll
ScalarEvolution: Analyze trip count of loops with a switch guarding the exit.
2014-02-11 15:44:32 +00:00
trip-count-unknown-stride.ll
Reapplying r278731 after fixing the problem that caused it to be reverted.
2016-09-16 14:38:13 +00:00
trip-count.ll
Be wary of abnormal exits from loop when exploiting UB
2016-06-09 01:13:59 +00:00
tripmultiple_calculation.ll
[SCEV] Fix trip multiple calculation
2017-03-20 20:25:46 +00:00
undefined.ll
…
unreachable-code.ll
…
unsimplified-loop.ll
…
urem-0.ll
[SCEV] Add URem support to SCEV
2017-09-01 14:59:59 +00:00
ZeroStep.ll
[SCEV] createAddRecFromPHI: Optimize for the most common case.
2017-05-03 23:53:38 +00:00
zext-signed-addrec.ll
[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction
2015-04-16 23:24:18 +00:00
zext-wrap.ll
[SCEV] Compute affine range in another way to avoid bitwidth extending.
2017-03-16 21:07:38 +00:00