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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110381] [11/12/13/14 Regression] double
 counting for sum of structs of floating point types
Date: Fri, 23 Jun 2023 20:07:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110381

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Lennox Ho from comment #3)
> Thanks. -fno-tree-vectorize appears to fix GCC 12.1 at -O2.
>=20
> Curious, why is -ftree-vectorize enabled at -O2 with GCC 12.1?

Yes see https://gcc.gnu.org/gcc-12/changes.html#general .


> The documents say it's only turned on by default with -O3
> ```
> https://gcc.gnu.org/projects/tree-ssa/vectorization.html
> Vectorization is enabled by the flag -ftree-vectorize and by default at -=
O3
> ```

That is not the documentation for the release but rather for the project wh=
ile
it was during development of it originally (back in early 2000s).

The documentation for the GCC 12.1 release is located at:
https://gcc.gnu.org/onlinedocs/gcc-12.1.0/gcc/Optimize-Options.html#index-f=
tree-vectorize

Which specifically mentions -ftree-loop-vectorize and -ftree-slp-vectorize =
are
enabled at -O2 and above (-ftree-vectorize is a meta option for those 2
options).=