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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/64928] [4.8/4.9/5 Regression] Inordinate cpu time and memory usage in "phase opt and generate" with -ftest-coverage -fprofile-arcs
Date: Fri, 06 Mar 2015 12:47:00 -0000	[thread overview]
Message-ID: <bug-64928-4-KzZVH70W6z@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-64928-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64928

--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 34974
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34974&action=edit
Patch to limit coalescing amount

The committed patch improves peak memory usage from 7.6GB to 5.8GB for the
small testcase.

The attached patch reduces memory usage from SSA coalescing further (to ~300MB)
by simply doing less coalescing.  Unfortunately the generated RTL puts a bigger
load on CSE/DF and thus we need 7.6GB again (eventually one can find an optimal
--param max-out-of-ssa-coalesce-names, but that's probably highly testcase
specific).

In theory you can iterate on coalescing piecewise as well, but the overhead
for doing this might be too big (basically up to computing live/conflict
for each coalesce pair separately, taking into account previous coalesces).


  parent reply	other threads:[~2015-03-06 12:47 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-03 21:09 [Bug other/64928] New: unreasonable " lucier at math dot purdue.edu
2015-02-03 21:11 ` [Bug other/64928] Inordinate " lucier at math dot purdue.edu
2015-02-03 21:33 ` pinskia at gcc dot gnu.org
2015-02-03 21:35 ` pinskia at gcc dot gnu.org
2015-02-03 21:49 ` lucier at math dot purdue.edu
2015-02-06  5:07 ` lucier at math dot purdue.edu
2015-02-06  5:08 ` lucier at math dot purdue.edu
2015-02-09 14:31 ` [Bug middle-end/64928] [4.8/4.9/5 Regression] " rguenth at gcc dot gnu.org
2015-02-09 15:07 ` rguenth at gcc dot gnu.org
2015-02-16 19:57 ` law at redhat dot com
2015-03-05 17:22 ` rguenth at gcc dot gnu.org
2015-03-05 23:07 ` steven at gcc dot gnu.org
2015-03-06  0:45 ` law at redhat dot com
2015-03-06 10:53 ` rguenth at gcc dot gnu.org
2015-03-06 12:35 ` rguenth at gcc dot gnu.org
2015-03-06 12:47 ` rguenth at gcc dot gnu.org [this message]
2015-03-06 12:53 ` rguenth at gcc dot gnu.org
2015-03-06 13:01 ` rguenth at gcc dot gnu.org
2015-03-18 12:54 ` rguenth at gcc dot gnu.org
2015-05-20 14:49 ` [Bug middle-end/64928] [4.8/4.9/5/6 " wellnhofer at aevum dot de
2015-05-20 14:49 ` wellnhofer at aevum dot de
2015-06-23  8:19 ` rguenth at gcc dot gnu.org
2015-06-26 19:56 ` [Bug middle-end/64928] [4.9/5/6 " jakub at gcc dot gnu.org
2015-06-26 20:28 ` jakub at gcc dot gnu.org
2020-09-29  0:14 ` [Bug middle-end/64928] [8/9/10/11 " lucier at math dot purdue.edu
2020-09-29  7:09 ` rguenth at gcc dot gnu.org
2020-09-29 12:17 ` lucier at math dot purdue.edu
2020-09-29 13:06 ` rguenther at suse dot de
2021-03-10  2:10 ` lucier at math dot purdue.edu
2021-03-10  2:13 ` lucier at math dot purdue.edu
2021-03-10  9:47 ` rguenth at gcc dot gnu.org
2021-03-10 14:16 ` lucier at math dot purdue.edu
2021-03-10 15:06 ` rguenth at gcc dot gnu.org
2021-05-14  9:47 ` [Bug middle-end/64928] [9/10/11/12 " jakub at gcc dot gnu.org
2021-06-01  8:06 ` rguenth at gcc dot gnu.org
2022-05-27  9:35 ` [Bug middle-end/64928] [10/11/12/13 " rguenth at gcc dot gnu.org
2022-06-28 10:31 ` jakub at gcc dot gnu.org
2023-07-07 10:30 ` [Bug middle-end/64928] [11/12/13/14 " rguenth at gcc dot gnu.org
2023-09-28  7:06 ` [Bug middle-end/64928] [11 " rguenth at gcc dot gnu.org
2023-10-02  0:26 ` lucier at math dot purdue.edu
2023-10-04  6:39 ` rguenth at gcc dot gnu.org

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