public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87832] AMD pipeline models are very costly size-wise
Date: Mon, 02 Jan 2023 16:39:08 +0000	[thread overview]
Message-ID: <bug-87832-4-1QC8ob7V9s@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-87832-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87832

--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Alexander Monakov <amonakov@gcc.gnu.org>:

https://gcc.gnu.org/g:ec1db9017939bb8289c9bd63aace66c0f3957ecd

commit r13-4956-gec1db9017939bb8289c9bd63aace66c0f3957ecd
Author: Alexander Monakov <amonakov@ispras.ru>
Date:   Fri Dec 9 20:47:55 2022 +0300

    i386: correct division modeling in lujiazui.md

    Model the divider in Lujiazui processors as a separate automaton to
    significantly reduce the overall model size. This should also result
    in improved accuracy, as pipe 0 should be able to accept new
    instructions while the divider is occupied.

    It is unclear why integer divisions are modeled as if pipes 0-3 are all
    occupied. I've opted to keep a single-cycle reservation of all four
    pipes together, so GCC should continue trying to pack instructions
    around a division accordingly.

    Currently top three symbols in insn-automata.o are:

    106102 r lujiazui_core_check
    106102 r lujiazui_core_transitions
    196123 r lujiazui_core_min_issue_delay

    This patch shrinks all lujiazui tables to:

    3 r lujiazui_decoder_min_issue_delay
    20 r lujiazui_decoder_transitions
    32 r lujiazui_agu_min_issue_delay
    126 r lujiazui_agu_transitions
    304 r lujiazui_div_base
    352 r lujiazui_div_check
    352 r lujiazui_div_transitions
    1152 r lujiazui_core_min_issue_delay
    1592 r lujiazui_agu_translate
    1592 r lujiazui_core_translate
    1592 r lujiazui_decoder_translate
    1592 r lujiazui_div_translate
    3952 r lujiazui_div_min_issue_delay
    9216 r lujiazui_core_transitions

    This continues the work on reducing i386 insn-automata.o size started
    with similar fixes for division and multiplication instructions in
    znver.md.

    gcc/ChangeLog:

            PR target/87832
            * config/i386/lujiazui.md (lujiazui_div): New automaton.
            (lua_div): New unit.
            (lua_idiv_qi): Correct unit in the reservation.
            (lua_idiv_qi_load): Ditto.
            (lua_idiv_hi): Ditto.
            (lua_idiv_hi_load): Ditto.
            (lua_idiv_si): Ditto.
            (lua_idiv_si_load): Ditto.
            (lua_idiv_di): Ditto.
            (lua_idiv_di_load): Ditto.
            (lua_fdiv_SF): Ditto.
            (lua_fdiv_SF_load): Ditto.
            (lua_fdiv_DF): Ditto.
            (lua_fdiv_DF_load): Ditto.
            (lua_fdiv_XF): Ditto.
            (lua_fdiv_XF_load): Ditto.
            (lua_ssediv_SF): Ditto.
            (lua_ssediv_load_SF): Ditto.
            (lua_ssediv_V4SF): Ditto.
            (lua_ssediv_load_V4SF): Ditto.
            (lua_ssediv_V8SF): Ditto.
            (lua_ssediv_load_V8SF): Ditto.
            (lua_ssediv_SD): Ditto.
            (lua_ssediv_load_SD): Ditto.
            (lua_ssediv_V2DF): Ditto.
            (lua_ssediv_load_V2DF): Ditto.
            (lua_ssediv_V4DF): Ditto.
            (lua_ssediv_load_V4DF): Ditto.

      parent reply	other threads:[~2023-01-02 16:39 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-87832-4@http.gcc.gnu.org/bugzilla/>
2022-10-24 18:48 ` amonakov at gcc dot gnu.org
2022-11-01 12:21 ` cvs-commit at gcc dot gnu.org
2022-11-07 11:23 ` amonakov at gcc dot gnu.org
2022-11-16 13:41 ` cvs-commit at gcc dot gnu.org
2022-11-16 13:41 ` cvs-commit at gcc dot gnu.org
2022-11-16 13:48 ` amonakov at gcc dot gnu.org
2022-11-16 14:16 ` hubicka at ucw dot cz
2022-11-16 14:30 ` amonakov at gcc dot gnu.org
2022-11-16 15:33   ` Jan Hubicka
2022-11-16 15:34 ` hubicka at ucw dot cz
2022-11-16 17:15 ` amonakov at gcc dot gnu.org
2022-12-07 15:23 ` amonakov at gcc dot gnu.org
2022-12-08  9:48 ` marxin at gcc dot gnu.org
2023-01-02 16:39 ` cvs-commit at gcc dot gnu.org [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=bug-87832-4-1QC8ob7V9s@http.gcc.gnu.org/bugzilla/ \
    --to=gcc-bugzilla@gcc.gnu.org \
    --cc=gcc-bugs@gcc.gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
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).