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From: "dominiq at lps dot ens dot fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/40106] [4.4/4.5 Regression] Weird interaction between optimize_insn_for_speed_p and -funsafe-math-optimizations
Date: Thu, 25 Feb 2010 17:20:00 -0000 [thread overview]
Message-ID: <20100225172014.32306.qmail@sourceware.org> (raw)
In-Reply-To: <bug-40106-12313@http.gcc.gnu.org/bugzilla/>
------- Comment #35 from dominiq at lps dot ens dot fr 2010-02-25 17:20 -------
I changed the summary to reflect the status of this pr (see comment #31). I
think the following questions should be answered:
(a) why optimize_insn_for_speed_p is changed by the options
-funsafe-math-optimizations and -fno-strict-overflow?
(b) why !optimize_size (lines 2929 and 2953 of
http://gcc.gnu.org/viewcvs/branches/gcc-4_3-branch/gcc/builtins.c?revision=151052&view=markup&sortby=file
last 4.3 revision) has been replaced with optimize_insn_for_speed_p () (lines
2961 and 2985 of
http://gcc.gnu.org/viewcvs/branches/gcc-4_4-branch/gcc/builtins.c?revision=145122&view=markup&sortby=file
first 4.4 revision)?
Side question, is there anybody really convinced that replacing pow(a,b) with
powi(a,n) when b==n is not always a win even for -Os?
Note that the replacement for x**(n/3) * cbrt(x)**(n%3) does not seems guarded
by any optimisation flag.
--
dominiq at lps dot ens dot fr changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[4.4/4.5 Regression] Time |[4.4/4.5 Regression] Weird
|increase for the Polyhedron |interaction between
|test air.f90 due to bad |optimize_insn_for_speed_p
|optimization |and -funsafe-math-
| |optimizations
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40106
next prev parent reply other threads:[~2010-02-25 17:20 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-11 18:04 [Bug middle-end/40106] New: Time increase with inlining for the Polyhedron test air.f90 dominiq at lps dot ens dot fr
2009-05-12 11:52 ` [Bug middle-end/40106] " hubicka at gcc dot gnu dot org
2009-05-12 13:23 ` dominiq at lps dot ens dot fr
2009-05-12 14:47 ` rguenther at suse dot de
2009-05-12 16:18 ` dominiq at lps dot ens dot fr
2009-05-22 20:39 ` dominiq at lps dot ens dot fr
2009-05-22 20:41 ` dominiq at lps dot ens dot fr
2009-05-22 20:52 ` dominiq at lps dot ens dot fr
2009-07-13 15:29 ` burnus at gcc dot gnu dot org
2009-08-25 11:56 ` dominiq at lps dot ens dot fr
2009-08-25 12:01 ` [Bug middle-end/40106] Time increase " dominiq at lps dot ens dot fr
2009-08-25 12:22 ` [Bug middle-end/40106] Time increase with inlining " rguenth at gcc dot gnu dot org
2009-08-25 12:30 ` dominiq at lps dot ens dot fr
2009-08-25 12:40 ` rguenther at suse dot de
2009-08-25 12:51 ` dominiq at lps dot ens dot fr
2009-08-25 15:31 ` dominiq at lps dot ens dot fr
2009-08-25 21:25 ` [Bug middle-end/40106] Time increase for the Polyhedron test air.f90 due to bad optimization dominiq at lps dot ens dot fr
2009-08-27 21:59 ` dominiq at lps dot ens dot fr
2009-08-28 1:09 ` howarth at nitro dot med dot uc dot edu
2009-08-28 5:39 ` dominiq at lps dot ens dot fr
2009-08-28 7:19 ` dominiq at lps dot ens dot fr
2009-08-28 12:01 ` dominiq at lps dot ens dot fr
2009-08-28 12:23 ` dominiq at lps dot ens dot fr
2009-08-28 13:36 ` howarth at nitro dot med dot uc dot edu
2009-08-31 13:06 ` dominiq at lps dot ens dot fr
2009-08-31 15:04 ` dominiq at lps dot ens dot fr
2009-08-31 15:21 ` jv244 at cam dot ac dot uk
2009-08-31 15:23 ` rguenther at suse dot de
2009-08-31 23:59 ` dominiq at lps dot ens dot fr
2009-09-01 9:37 ` dominiq at lps dot ens dot fr
2009-09-03 7:10 ` [Bug middle-end/40106] [4.4/4.5 Regression] " dominiq at lps dot ens dot fr
2009-09-03 11:20 ` dominiq at lps dot ens dot fr
2009-09-06 22:15 ` rguenth at gcc dot gnu dot org
2009-09-18 8:58 ` rguenth at gcc dot gnu dot org
2009-10-15 12:49 ` jakub at gcc dot gnu dot org
2009-10-18 13:22 ` rguenth at gcc dot gnu dot org
2009-12-15 16:40 ` rguenth at gcc dot gnu dot org
2010-01-21 13:16 ` jakub at gcc dot gnu dot org
2010-02-25 17:20 ` dominiq at lps dot ens dot fr [this message]
2010-03-16 15:07 ` [Bug middle-end/40106] [4.4/4.5 Regression] Weird interaction between optimize_insn_for_speed_p and -funsafe-math-optimizations dominiq at lps dot ens dot fr
2010-03-16 15:11 ` rguenther at suse dot de
2010-03-16 15:26 ` rguenth at gcc dot gnu dot org
2010-03-16 15:50 ` dominiq at lps dot ens dot fr
2010-03-16 15:52 ` rguenther at suse dot de
2010-03-16 16:04 ` dominiq at lps dot ens dot fr
2010-03-16 16:07 ` rguenther at suse dot de
2010-03-16 16:39 ` dominiq at lps dot ens dot fr
2010-03-16 16:59 ` jakub at gcc dot gnu dot org
2010-03-16 17:14 ` dominiq at lps dot ens dot fr
2010-03-18 18:30 ` dominiq at lps dot ens dot fr
2010-03-19 10:26 ` rguenth at gcc dot gnu dot org
2010-03-19 10:35 ` rguenth at gcc dot gnu dot org
2010-03-19 15:40 ` dominiq at lps dot ens dot fr
2010-03-20 13:03 ` dominiq at lps dot ens dot fr
2010-03-20 13:21 ` dominiq at lps dot ens dot fr
2010-03-20 14:19 ` rguenther at suse dot de
2010-03-20 14:40 ` dominiq at lps dot ens dot fr
2010-03-20 15:00 ` rguenth at gcc dot gnu dot org
2010-03-20 15:12 ` rguenth at gcc dot gnu dot org
2010-03-22 10:36 ` rguenth at gcc dot gnu dot org
2010-03-22 12:38 ` rguenth at gcc dot gnu dot org
2010-03-22 12:39 ` [Bug middle-end/40106] [4.4 " rguenth at gcc dot gnu dot org
2010-03-25 17:38 ` hubicka at gcc dot gnu dot org
2010-04-30 9:01 ` jakub at gcc dot gnu dot org
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