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llvm-project/llvm/test/Analysis/ScalarEvolution
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Florian Hahn 1625224fbb
[SCEV] Replace assert with returning CouldNotComp in computeMaxBECountForLT. 
This patch removes the bail out for signed predicates and non-positive
strides in howManyLessThans and updates computeMaxBECountForLT to return
SCEVCouldNotCompute for signed predicates with negative strides.

AFAICT bail-out was only added because computeMaxBECountForLT may not
handle negative signed strides correctly. Instead of not calling
computeMaxBECountForLT at all because we bail out earlier, we can
instead return SCEVCouldNotCompute in computeMaxBECountForLT.

The max backedge taken count will be computed as the max value of the
symbolic backedge taken count.

This improves precision in cases where we can compute symbolic backedge
taken counts and also fixes a crash.

Fixes #57818.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D135667
 		2022-10-19 11:24:10 +01:00
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2008-11-02-QuadraticCrash.ll [test] Cleanup legacy PM tests in llvm/test/Analyis/ScalarEvolution 2021-09-04 15:57:30 -07:00
2008-11-15-CubicOOM.ll [test] Cleanup legacy PM tests in llvm/test/Analyis/ScalarEvolution 2021-09-04 15:57:30 -07:00
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2009-07-04-GroupConstantsWidthMismatch.ll [test] Cleanup legacy PM tests in llvm/test/Analyis/ScalarEvolution 2021-09-04 15:57:30 -07:00
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addrec-computed-during-addrec-calculation.ll [SCEV] Remove incorrect assert 2021-11-29 17:09:12 +01:00
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annotation-intrinsics.ll [SCEV] recognize llvm.annotation intrinsic 2022-07-03 21:02:50 -04:00
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becount-invalidation.ll Reland [SCEV] Fix and validate ValueExprMap/ExprValueMap consistency 2021-11-27 12:37:15 +01:00
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exact-exit-count-more-precise.ll [SCEV] Recognize binary `and` as bit-wise `umin` 2022-02-10 17:42:54 +03:00
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exit-count-select-safe.ll [SCEV] Fold umin_seq using known predicate 2022-05-09 16:35:08 +02:00
exit-count-select.ll [SCEV] Recognize logical `or` as `not umin_seq (not, not)` 2022-02-10 17:42:55 +03:00
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load.ll [SCEV] Use full logic when infering flags on add and gep 2021-10-03 15:32:15 -07:00
logical-operations.ll [NFC][SCEV] Recognize umin_seq when operand is zext'ed in zero-check 2022-02-16 22:16:02 +03:00
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max-trip-count.ll [SCEV] Replace assert with returning CouldNotComp in computeMaxBECountForLT. 2022-10-19 11:24:10 +01:00
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pr22674.ll Revert "[NFC] remove explicit default value for strboolattr attribute in tests" 2021-05-24 19:43:40 +02:00
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undefined.ll [test][NewPM] Remove RUN lines using -analyze 2021-09-02 11:38:14 -07:00
unknown_phis.ll Revert "[SCEV] Infer ranges for SCC consisting of cycled Phis" 2022-03-04 19:52:44 -08:00
unreachable-code.ll [SCEV] Use SCEVUnknown(poison) instead of SCEVUnknown(undef). 2022-06-27 09:33:05 +01:00
unsimplified-loop.ll [test][NewPM] Remove RUN lines using -analyze 2021-09-02 11:38:14 -07:00
urem-0.ll [SCEV] Canonicalize X - urem X, Y patterns 2021-11-16 11:59:21 -08:00
values-at-scopes-consistency.ll [SCEV] Fix ValuesAtScopesUsers consistency 2021-12-03 10:03:10 +01:00
widenable-condition.ll [SCEV] Recognize binary `and` as bit-wise `umin` 2022-02-10 17:42:54 +03:00
zext-divrem.ll [test][NewPM] Remove RUN lines using -analyze 2021-09-02 11:38:14 -07:00
zext-mul.ll [test][NewPM] Remove RUN lines using -analyze 2021-09-02 11:38:14 -07:00
zext-signed-addrec.ll
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zext-wrap.ll [test][NewPM] Remove RUN lines using -analyze 2021-09-02 11:38:14 -07:00