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From: "dominiq at lps dot ens.fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/54717] [4.8 Regression] Runtime regression: polyhedron test "rnflow" degraded
Date: Tue, 02 Oct 2012 20:24:00 -0000	[thread overview]
Message-ID: <bug-54717-4-qXFjPptQXd@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-54717-4@http.gcc.gnu.org/bugzilla/>


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54717

--- Comment #8 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2012-10-02 20:23:42 UTC ---
Created attachment 28333
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28333
bzipped tar archive of a reduced test

The tar archive contains the files
cptrf2_inl_1.f90  rnflow.in  rnflow_red.f90  rnfprm.h
and can be used as in

[macbook] dbg_rnflow/pr54717% gfc -c -Ofast -funroll-loops rnflow_red.f90
[macbook] dbg_rnflow/pr54717% gfc -c -O2 cptrf2_inl_1.f90
[macbook] dbg_rnflow/pr54717% gfc rnflow_red.o cptrf2_inl_1.o
[macbook] dbg_rnflow/pr54717% time a.out > /dev/null
21.036u 0.051s 0:21.09 99.9%    0+0k 0+0io 0pf+0w
[macbook] dbg_rnflow/pr54717% gfc -c -O2 -ftree-loop-if-convert
cptrf2_inl_1.f90
[macbook] dbg_rnflow/pr54717% gfc rnflow_red.o cptrf2_inl_1.o
[macbook] dbg_rnflow/pr54717% time a.out > /dev/null
27.150u 0.051s 0:27.20 100.0%    0+0k 0+0io 0pf+0w

This shows that the file cptrf2_inl_1.f90 compiled with -ftree-loop-if-convert
gives a slow executable without involving inlining or vectorization.


  parent reply	other threads:[~2012-10-02 20:24 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-26 12:54 [Bug tree-optimization/54717] New: " sergos.gnu at gmail dot com
2012-09-26 13:17 ` [Bug tree-optimization/54717] " ubizjak at gmail dot com
2012-09-26 14:17 ` [Bug tree-optimization/54717] [4.8 Regression] " rguenth at gcc dot gnu.org
2012-09-26 15:12 ` sergos.gnu at gmail dot com
2012-09-26 15:41 ` dominiq at lps dot ens.fr
2012-09-26 20:07 ` sergos.gnu at gmail dot com
2012-09-27  9:28 ` rguenth at gcc dot gnu.org
2012-09-27 10:43 ` rguenth at gcc dot gnu.org
2012-10-02 20:24 ` dominiq at lps dot ens.fr [this message]
2012-10-08  8:55 ` sergos.gnu at gmail dot com
2012-11-13 18:40 ` ubizjak at gmail dot com
2012-11-13 18:54 ` dominiq at lps dot ens.fr
2012-11-14 18:56 ` sergos.gnu at gmail dot com
2012-11-14 19:42   ` Jan Hubicka
2012-11-14 19:43 ` hubicka at ucw dot cz
2012-11-14 20:11 ` hubicka at gcc dot gnu.org
2012-11-15 10:28 ` hubicka at gcc dot gnu.org
2012-11-15 10:52 ` hubicka at gcc dot gnu.org
2012-11-15 15:07 ` dominiq at lps dot ens.fr
2012-11-16 10:37 ` hubicka at gcc dot gnu.org
2012-12-06 16:51 ` rguenth at gcc dot gnu.org

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