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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: Thu, 05 Mar 2015 17:22:00 -0000	[thread overview]
Message-ID: <bug-64928-4-BHfL9LjhRp@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 #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, so it's already calculate_live_ranges that takes much memory.  I have a
small patch to improve that somewhat.

But what we really need is to get the "must coalesce" stuff "coalesced" with
respect to both live and conflict computation.  That is, map must-coalesce
SSA vars to the same partition.  That loses the SSA corruption testing, but
well so it might be much more controversical (silent wrong-code instead of
ICE).
Unfortunately in the testcase there are only 2750 must-coalesces but
109493 partitions participating in the coalescing (so at least 50000 want
coalesces).

The good news is of course that we can simply choose to _not_ coalesce that
many variables, but say only the important ones.


  parent reply	other threads:[~2015-03-05 17:22 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 [this message]
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
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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