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Author SHA1 Message Date
Dávid Bolvanský ee51c42e00 Reduce the number of attributes attached to each function 
This takes advantage of the implicit default behavior to reduce the number of
attributes.
 2021-02-20 06:57:47 +01:00
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 / cecc0d27ad
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