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Revision tags: llvmorg-18.1.8, llvmorg-18.1.7, llvmorg-18.1.6, llvmorg-18.1.5, llvmorg-18.1.4, llvmorg-18.1.3, llvmorg-18.1.2, llvmorg-18.1.1, llvmorg-18.1.0, llvmorg-18.1.0-rc4, llvmorg-18.1.0-rc3, llvmorg-18.1.0-rc2, llvmorg-18.1.0-rc1, llvmorg-19-init |
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fbcf8a8c |
| 23-Dec-2023 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElim] Add (UGE, var, 0) to unsigned system for new vars. (#76262)
The constraint system used for ConstraintElimination assumes all
varibles to be signed. This can cause missed optimizati
[ConstraintElim] Add (UGE, var, 0) to unsigned system for new vars. (#76262)
The constraint system used for ConstraintElimination assumes all
varibles to be signed. This can cause missed optimization in the
unsigned system, due to missing the information that all variables are
unsigned (non-negative).
Variables can be marked as non-negative by adding Var >= 0 for all
variables. This is done for arguments on ConstraintInfo construction and
after adding new variables. This handles cases like the ones outlined in
https://discourse.llvm.org/t/why-does-llvm-not-perform-range-analysis-on-integer-values/74341
The original example shared above is now handled without this change,
but adding another variable means that instcombine won't be able to
simplify examples like https://godbolt.org/z/hTnra7zdY
Adding the extra variables comes with a slight compile-time increase
https://llvm-compile-time-tracker.com/compare.php?from=7568b36a2bc1a1e496ec29246966ffdfc3a8b87f&to=641a47f0acce7755e340447386013a2e086f03d9&stat=instructions:u
stage1-O3 stage1-ReleaseThinLTO stage1-ReleaseLTO-g stage1-O0-g
+0.04% +0.07% +0.05% +0.02%
stage2-O3 stage2-O0-g stage2-clang
+0.05% +0.05% +0.05%
https://github.com/llvm/llvm-project/pull/76262
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Revision tags: llvmorg-17.0.6, llvmorg-17.0.5, llvmorg-17.0.4, llvmorg-17.0.3, llvmorg-17.0.2, llvmorg-17.0.1, llvmorg-17.0.0, llvmorg-17.0.0-rc4 |
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| #
13ffde31 |
| 24-Aug-2023 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElim] Remove dead compares after simplification.
Remove compares after replacing all uses. Cleaning dead compares can
enable additional simplifications when adjusting the position of the
[ConstraintElim] Remove dead compares after simplification.
Remove compares after replacing all uses. Cleaning dead compares can
enable additional simplifications when adjusting the position of the
pass slightly. In particular, it seems like the additional dead
instructions may prevent SimplifyCFG performing some folds.
Reviewed By: nikic
Differential Revision: https://reviews.llvm.org/D158760
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Revision tags: llvmorg-17.0.0-rc3, llvmorg-17.0.0-rc2, llvmorg-17.0.0-rc1, llvmorg-18-init, llvmorg-16.0.6, llvmorg-16.0.5, llvmorg-16.0.4, llvmorg-16.0.3, llvmorg-16.0.2, llvmorg-16.0.1, llvmorg-16.0.0, llvmorg-16.0.0-rc4, llvmorg-16.0.0-rc3, llvmorg-16.0.0-rc2, llvmorg-16.0.0-rc1, llvmorg-17-init, llvmorg-15.0.7, llvmorg-15.0.6, llvmorg-15.0.5, llvmorg-15.0.4, llvmorg-15.0.3 |
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| #
572d5d37 |
| 13-Oct-2022 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElim] Add support for GEPs with multiple indices.
Lift restriction on GEPs with a single index by iterating over all
indices and joining the {Coefficient, Variable} entries for all indice
[ConstraintElim] Add support for GEPs with multiple indices.
Lift restriction on GEPs with a single index by iterating over all
indices and joining the {Coefficient, Variable} entries for all indices
together.
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| #
c5e1ddb6 |
| 06-Oct-2022 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Update tests to use opaque pointers.
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Revision tags: working, llvmorg-15.0.2, llvmorg-15.0.1, llvmorg-15.0.0, llvmorg-15.0.0-rc3, llvmorg-15.0.0-rc2, llvmorg-15.0.0-rc1, llvmorg-16-init, llvmorg-14.0.6, llvmorg-14.0.5, llvmorg-14.0.4, llvmorg-14.0.3, llvmorg-14.0.2, llvmorg-14.0.1, llvmorg-14.0.0, llvmorg-14.0.0-rc4, llvmorg-14.0.0-rc3, llvmorg-14.0.0-rc2, llvmorg-14.0.0-rc1, llvmorg-15-init, llvmorg-13.0.1, llvmorg-13.0.1-rc3, llvmorg-13.0.1-rc2, llvmorg-13.0.1-rc1 |
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| #
8ebb3eac |
| 18-Nov-2021 |
Bjorn Pettersson <bjorn.a.pettersson@ericsson.com> |
[test] Use -passes syntax when specifying pipeline in some more tests
The legacy PM is deprecated, so update a bunch of lit tests running
opt to use the new PM syntax when specifying the pipeline.
I
[test] Use -passes syntax when specifying pipeline in some more tests
The legacy PM is deprecated, so update a bunch of lit tests running
opt to use the new PM syntax when specifying the pipeline.
In this patch focus has been put on test cases for ConstantMerge,
ConstraintElimination, CorrelatedValuePropagation, GlobalDCE,
GlobalOpt, SCCP, TailCallElim and PredicateInfo.
Differential Revision: https://reviews.llvm.org/D114516
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Revision tags: llvmorg-13.0.0, llvmorg-13.0.0-rc4, llvmorg-13.0.0-rc3, llvmorg-13.0.0-rc2, llvmorg-13.0.0-rc1, llvmorg-14-init, llvmorg-12.0.1, llvmorg-12.0.1-rc4, llvmorg-12.0.1-rc3, llvmorg-12.0.1-rc2, llvmorg-12.0.1-rc1, llvmorg-12.0.0, llvmorg-12.0.0-rc5, llvmorg-12.0.0-rc4 |
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| #
cb3b5f07 |
| 22-Mar-2021 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Add multi-dimension GEP tests.
Add a set of interesting test cases with multi-dimensional GEPs for
upcoming patches.
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