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[Bug lto/44334] [4.6 Regression] rnflow.f90 ~27% slower with -fwhole-program -flto after revision 159852
- From: "dominiq at lps dot ens dot fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 May 2010 18:06:01 -0000
- Subject: [Bug lto/44334] [4.6 Regression] rnflow.f90 ~27% slower with -fwhole-program -flto after revision 159852
- References: <bug-44334-12313@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #1 from dominiq at lps dot ens dot fr 2010-05-30 18:06 -------
I'll attach the assembly generated with -O3 -ffast-math -funroll-loops
-fomit-frame-pointer -flto for revisions 159851 and 159852. It is the same
with/without -fwhole-program (probably obvious), however when assembled and
linked with
gfcp -O3 -ffast-math -funroll-loops -fomit-frame-pointer -fwhole-program -flto
rnflow_wp5*.s
the timing depends on the revision used to generate the assembly, but not on
the compiler revision.
--
dominiq at lps dot ens dot fr changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rguenther at suse dot de, jh
| |at suse dot cz, pault at gcc
| |dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44334