public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug rtl-optimization/53595] New: Code size increase of +10% between two 4.7.1 snapshot
@ 2012-06-06 19:53 gjl at gcc dot gnu.org
  2012-06-06 19:54 ` [Bug rtl-optimization/53595] " gjl at gcc dot gnu.org
                   ` (13 more replies)
  0 siblings, 14 replies; 15+ messages in thread
From: gjl at gcc dot gnu.org @ 2012-06-06 19:53 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53595

             Bug #: 53595
           Summary: Code size increase of +10% between two 4.7.1 snapshot
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gjl@gcc.gnu.org


Created attachment 27568
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27568
C source

This problem report is about a +10% of code size increase between the following
two 4.7.1 versions of gcc:

V1: SVN 185693 gcc-4_7-branch from 2012-03-22, 4.7.1 (prerelease)
V2: SVN 188257 gcc-4_7-branch from 2012-06-06, 4.7.1 (prerelease)

The attached test case is a reduced test case out of many other sources that
suffer from the same problem, so that the overall performance degradation is
unpleasant.

The RTL dumps show that the first pass that differs is IRA.

== Command line ==

$ avr-gcc -mmcu=atmega168 -c -std=gnu99 -Os -mstrict-X -ffixed-2 -ffixed-3 -dp
-fdump-rtl-ira-details -fdump-rtl-reload-details -fdump-rtl-postreload-details
bresenham-i.c -o bresenham-i-1.o -save-temps=obj

resp. with  -o bresenham-i-2.o for the second 4.7.1 snapshot.

== GCC configure ==

Target: avr
Configured with: ../../gcc.gnu.org/gcc-4_7-branch/configure --target=avr
--prefix=/local/gnu/install/gcc-4.7-mingw32 --host=i386-mingw32
--build=i686-linux-gnu --enable-languages=c,c++ --disable-nls --disable-shared
--with-dwarf2
Thread model: single
gcc version 4.7.1 20120606 (prerelease) (GCC) 

GNU C (GCC) version 4.7.1 20120606 (prerelease) (avr)
    compiled by GNU C version 3.4.5 (mingw-vista special r2), GMP version
4.3.2, MPFR version 2.4.2, MPC version 0.8.2

It's a canadian cross, but that surely does not matter here...


^ permalink raw reply	[flat|nested] 15+ messages in thread
end of thread, other threads:[~2012-06-28 14:02 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-06-06 19:53 [Bug rtl-optimization/53595] New: Code size increase of +10% between two 4.7.1 snapshot gjl at gcc dot gnu.org
2012-06-06 19:54 ` [Bug rtl-optimization/53595] " gjl at gcc dot gnu.org
2012-06-06 19:56 ` gjl at gcc dot gnu.org
2012-06-06 19:57 ` gjl at gcc dot gnu.org
2012-06-06 19:58 ` gjl at gcc dot gnu.org
2012-06-06 20:01 ` jakub at gcc dot gnu.org
2012-06-06 20:05 ` gjl at gcc dot gnu.org
2012-06-06 20:12 ` gjl at gcc dot gnu.org
2012-06-07 13:25 ` gjl at gcc dot gnu.org
2012-06-07 13:27 ` gjl at gcc dot gnu.org
2012-06-07 13:31 ` gjl at gcc dot gnu.org
2012-06-08 17:04 ` gjl at gcc dot gnu.org
2012-06-28 13:54 ` gjl at gcc dot gnu.org
2012-06-28 13:58 ` gjl at gcc dot gnu.org
2012-06-28 14:02 ` [Bug other/53595] " gjl at gcc dot gnu.org

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).