From: Hongtao Liu <crazylht@gmail.com>
To: Ezhil P <ezhil.college@gmail.com>
Cc: gcc-help <gcc-help@gcc.gnu.org>
Subject: Re: Machine dependent optimization
Date: Mon, 28 Feb 2022 13:30:33 +0800 [thread overview]
Message-ID: <CAMZc-bytnLOXdxprPux8Dzmmj+_8iox4g5DAsGfrj=fQ5WO19A@mail.gmail.com> (raw)
In-Reply-To: <CAFFxOEKNxrb006eRPFBGRrMq3Wse1TK+602VnSKw6k=UmthKmQ@mail.gmail.com>
On Sun, Feb 27, 2022 at 9:29 AM Ezhil P via Gcc-help
<gcc-help@gcc.gnu.org> wrote:
>
> Hi,
> I understand that Machine independent optimizations happen in the middle
> end of GCC and machine dependent optimizations happen in the back end of
> GCC.
>
> Can you please list few machine dependent optimization relevant for x-86
> processor architecture?
You can take a look at pass_insert_vzeroupper, pass_stv, and etc..
27 INSERT_PASS_AFTER (pass_reload, 1, pass_insert_vzeroupper);
28 INSERT_PASS_AFTER (pass_combine, 1, pass_stv, false /* timode_p */);
29 /* Run the 64-bit STV pass before the CSE pass so that CONST0_RTX and
30 CONSTM1_RTX generated by the STV pass can be CSEed. */
31 INSERT_PASS_BEFORE (pass_cse2, 1, pass_stv, true /* timode_p */);
32
33 INSERT_PASS_BEFORE (pass_shorten_branches, 1,
pass_insert_endbr_and_patchable_area);
34
35 INSERT_PASS_AFTER (pass_combine, 1, pass_remove_partial_avx_dependency);
--
BR,
Hongtao
prev parent reply other threads:[~2022-02-28 5:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-27 1:28 Ezhil P
2022-02-28 5:30 ` Hongtao Liu [this message]
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