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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, 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, 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 |
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| #
2229674c |
| 16-Mar-2022 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Add additional tests with uncond branches.
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Revision tags: llvmorg-14.0.0, llvmorg-14.0.0-rc4, llvmorg-14.0.0-rc3, llvmorg-14.0.0-rc2, llvmorg-14.0.0-rc1 |
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| #
413e47ec |
| 03-Feb-2022 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Handle degenerate case with branch to same dest.
When a conditional branch has the same block as both true and false
successor it is not safe to add the condition.
Fixes PR4
[ConstraintElimination] Handle degenerate case with branch to same dest.
When a conditional branch has the same block as both true and false
successor it is not safe to add the condition.
Fixes PR49819.
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e39bbe9a |
| 03-Feb-2022 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Add test cases from PR49819.
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Revision tags: 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 |
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| #
0bcfd4cb |
| 26-Aug-2021 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Rewrite tests to reduce verification complexity.
This patch reduces the bitwidth of types certain tests operate and gets
rid of a number of @use(i1) calls and xor's the condi
[ConstraintElimination] Rewrite tests to reduce verification complexity.
This patch reduces the bitwidth of types certain tests operate and gets
rid of a number of @use(i1) calls and xor's the conditions together
instead, which eliminates all timeouts when verifying the tests.
See https://github.com/AliveToolkit/alive2/issues/744 for more details.
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Revision tags: 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, llvmorg-12.0.0-rc3, llvmorg-12.0.0-rc2, llvmorg-11.1.0, llvmorg-11.1.0-rc3 |
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| #
703f6a68 |
| 03-Feb-2021 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Support conditions from loop preheaders
This patch extends the condition collection logic to allow adding
conditions from pre-headers to loop headers, by allowing cases where
[ConstraintElimination] Support conditions from loop preheaders
This patch extends the condition collection logic to allow adding
conditions from pre-headers to loop headers, by allowing cases where the
target block dominates some of its predecessors.
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be0bf04b |
| 03-Feb-2021 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Add some tests with conds in loop header.
This patch adds a set of tests in which we can add the information from
the pre-header to a loop header, but currently do not do so.
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Revision tags: llvmorg-12.0.0-rc1, llvmorg-13-init, llvmorg-11.1.0-rc2, llvmorg-11.1.0-rc1, llvmorg-11.0.1, llvmorg-11.0.1-rc2, llvmorg-11.0.1-rc1, llvmorg-11.0.0, llvmorg-11.0.0-rc6, llvmorg-11.0.0-rc5, llvmorg-11.0.0-rc4 |
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| #
50bd71e1 |
| 27-Sep-2020 |
Fangrui Song <i@maskray.me> |
[NewPM] Port ConstraintElimination to the new pass manager
If -enable-constraint-elimination is specified, add it to the -O2/-O3 pipeline.
(-O1 uses a separate function now.)
Reviewed By: fhahn, ae
[NewPM] Port ConstraintElimination to the new pass manager
If -enable-constraint-elimination is specified, add it to the -O2/-O3 pipeline.
(-O1 uses a separate function now.)
Reviewed By: fhahn, aeubanks
Differential Revision: https://reviews.llvm.org/D88365
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Revision tags: llvmorg-11.0.0-rc3 |
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| #
3d42d549 |
| 15-Sep-2020 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Add constraint elimination pass.
This patch is a first draft of a new pass that adds a more flexible way
to eliminate compares based on more complex constraints collected fro
[ConstraintElimination] Add constraint elimination pass.
This patch is a first draft of a new pass that adds a more flexible way
to eliminate compares based on more complex constraints collected from
dominating conditions.
In particular, it aims at simplifying conditions of the forms below
using a forward propagation approach, rather than instcomine-style
ad-hoc backwards walking of def-use chains.
if (x < y)
if (y < z)
if (x < z) <- simplify
or
if (x + 2 < y)
if (x + 1 < y) <- simplify assuming no wraps
The general approach is to collect conditions and blocks, sort them by
dominance and then iterate over the sorted list. Conditions are turned
into a linear inequality and add it to a system containing the linear
inequalities that hold on entry to the block. For blocks, we check each
compare against the system and see if it is implied by the constraints
in the system.
We also keep a stack of processed conditions and remove conditions from
the stack and the constraint system once they go out-of-scope (= do not
dominate the current block any longer).
Currently there still are the least the following areas for improvements
* Currently large unsigned constants cannot be added to the system
(coefficients must be represented as integers)
* The way constraints are managed currently is not very optimized.
Reviewed By: spatel
Differential Revision: https://reviews.llvm.org/D84547
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Revision tags: llvmorg-11.0.0-rc2, llvmorg-11.0.0-rc1 |
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| #
802d21cd |
| 24-Jul-2020 |
Florian Hahn <flo@fhahn.com> |
[ConstraintElimination] Add initial tests.
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