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Author	SHA1	Message	Date
Roman Lebedev	03bd5198b6	[OldPM] Pass manager: run SROA after (simple) loop unrolling I have stumbled into this pretty accidentally, when rewriting some spaghetti-like code into something more structured, which involved using some `std::array<>`s. And to my surprise, the `alloca`s remained, causing about `+160%` perf regression. https://llvm-compile-time-tracker.com/compare.php?from=bb6f4d32aac3eecb51909f4facc625219307ee68&to=d563e66f40f9d4d145cb2050e41cb961e2b37785&stat=instructions suggests that this has geomean compile-time cost of `+0.08%`. Note that D68593 / cecc0d27ad58c0aed8ef9ed99bbf691e137a0f26 already did this chage for NewPM, but left OldPM in a pessimized state. This fixes [[ https://bugs.llvm.org/show_bug.cgi?id=40011 \| PR40011 ]], [[ https://bugs.llvm.org/show_bug.cgi?id=42794 \| PR42794 ]] and probably some other reports. Reviewed By: nikic, xbolva00 Differential Revision: https://reviews.llvm.org/D87972	2020-10-04 11:53:50 +03:00
Fangrui Song	e0b3a8c991	[CodeGenCXX][test] Use -fno-experimental-new-pass-manager for CodeGenCXX/union-tbaa2.cpp after D68593/llvmorg-10-init-8907-gcecc0d27ad5 It fails with -DENABLE_EXPERIMENTAL_NEW_PASS_MANAGER=0 builds. Temporarily use -fno-experimental-new-pass-manager while we are investigating the root cause.	2019-11-02 15:58:54 -07:00
Krzysztof Parzyszek	5960a57ef7	[CodeGen] Pessimize aliasing for member unions (and may-alias) objects Use the TBAA info of the omnipotent char for these objects. Differential Revision: https://reviews.llvm.org/D33328 llvm-svn: 303851	2017-05-25 12:55:47 +00:00

Author

SHA1

Message

Date

Roman Lebedev

03bd5198b6

[OldPM] Pass manager: run SROA after (simple) loop unrolling

I have stumbled into this pretty accidentally, when rewriting
some spaghetti-like code into something more structured,
which involved using some `std::array<>`s. And to my surprise,
the `alloca`s remained, causing about `+160%` perf regression.

https://llvm-compile-time-tracker.com/compare.php?from=bb6f4d32aac3eecb51909f4facc625219307ee68&to=d563e66f40f9d4d145cb2050e41cb961e2b37785&stat=instructions
suggests that this has geomean compile-time cost of `+0.08%`.

Note that D68593 / cecc0d27ad58c0aed8ef9ed99bbf691e137a0f26
already did this chage for NewPM, but left OldPM in a pessimized state.

This fixes [[ https://bugs.llvm.org/show_bug.cgi?id=40011 | PR40011 ]], [[ https://bugs.llvm.org/show_bug.cgi?id=42794 | PR42794 ]] and probably some other reports.

Reviewed By: nikic, xbolva00

Differential Revision: https://reviews.llvm.org/D87972

2020-10-04 11:53:50 +03:00

Fangrui Song

e0b3a8c991

[CodeGenCXX][test] Use -fno-experimental-new-pass-manager for CodeGenCXX/union-tbaa2.cpp after D68593/llvmorg-10-init-8907-gcecc0d27ad5

It fails with -DENABLE_EXPERIMENTAL_NEW_PASS_MANAGER=0 builds. Temporarily use -fno-experimental-new-pass-manager while we are investigating the root cause.

2019-11-02 15:58:54 -07:00

Krzysztof Parzyszek

5960a57ef7

[CodeGen] Pessimize aliasing for member unions (and may-alias) objects

Use the TBAA info of the omnipotent char for these objects.

Differential Revision: https://reviews.llvm.org/D33328

llvm-svn: 303851

2017-05-25 12:55:47 +00:00

3 Commits