* Machine dependent optimization
@ 2022-02-27 1:28 Ezhil P
2022-02-28 5:30 ` Hongtao Liu
0 siblings, 1 reply; 2+ messages in thread
From: Ezhil P @ 2022-02-27 1:28 UTC (permalink / raw)
To: gcc-help
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?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Machine dependent optimization
2022-02-27 1:28 Machine dependent optimization Ezhil P
@ 2022-02-28 5:30 ` Hongtao Liu
0 siblings, 0 replies; 2+ messages in thread
From: Hongtao Liu @ 2022-02-28 5:30 UTC (permalink / raw)
To: Ezhil P; +Cc: gcc-help
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
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-02-28 5:30 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-02-27 1:28 Machine dependent optimization Ezhil P
2022-02-28 5:30 ` Hongtao Liu
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).