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From: "hubicka at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/40106] Time increase with inlining for the Polyhedron test air.f90
Date: Tue, 12 May 2009 11:52:00 -0000	[thread overview]
Message-ID: <20090512115202.18999.qmail@sourceware.org> (raw)
In-Reply-To: <bug-40106-12313@http.gcc.gnu.org/bugzilla/>



------- Comment #1 from hubicka at gcc dot gnu dot org  2009-05-12 11:52 -------
Hmm, the inlined functions has loop depth of 4, that makes it predicted to
iterate quite few times. My guess would be that inlining increases loop depth
that in turn makes GCC to conclude that one of loops that are in fact internal
hot loops are cold. decreasing --param hot-bb-frequency-fraction might help in
this case.

I've seen this in past, just hope it is quite rare.
If we find enough testcases like this, it might make sense to alter the
predicate deciding on hot-bb to always consider innermost loops hot no mater on
their relative frequency.  Woud need to have flag on BB or loop structure
always available though.

Honza


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40106


  reply	other threads:[~2009-05-12 11:52 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-11 18:04 [Bug middle-end/40106] New: " dominiq at lps dot ens dot fr
2009-05-12 11:52 ` hubicka at gcc dot gnu dot org [this message]
2009-05-12 13:23 ` [Bug middle-end/40106] " 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 ` [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 15:07 ` 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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