------- Comment #8 from sgunderson at bigfoot dot com 2008-11-30 21:19 -------
Subject: Re: Massive performance regression
for jpeg_idct_islow
On Sun, Nov 30, 2008 at 09:04:07PM -0000, rguenth at gcc dot gnu dot org wrote:
> Append -v to the command-line you use for compiling ;) Seriously, if using
> -mtune=generic works then this is a Debian packaging issue of their
> gcc-snapshot compiler.
fugl:~/nmu/libjpeg6b-6b> /usr/lib/gcc-snapshot/bin/gcc -D_REENTRANT -g -Wall
-O2 -g -I. -c ./jidctint.c -fPIC -DPIC -o .libs/jidctint.o -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 20081117-1'
--with-bugurl=file:///usr/share/doc/gcc-snapshot/README.Bugs
--enable-languages=c,c++,java,fortran,objc,obj-c++,ada
--prefix=/usr/lib/gcc-snapshot --enable-shared --with-system-zlib --disable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-java-awt=gtk
--enable-gtk-cairo --disable-plugin
--with-java-home=/usr/lib/gcc-snapshot/java-1.5.0-gcj-4.4-1.5.0.0/jre
--enable-java-home --with-jvm-root-dir=/usr/lib/gcc-snapshot/jvm
--with-jvm-jar-dir=/usr/lib/gcc-snapshot/jvm-exports
--with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-mpfr
--enable-targets=all --enable-cld --disable-werror --build=i486-linux-gnu
--host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.4.0 20081117 (experimental) [trunk revision 141948] (Debian
20081117-1)
COLLECT_GCC_OPTIONS='-D_REENTRANT' '-g' '-Wall' '-O2' '-g' '-I.' '-c' '-fPIC'
'-DPIC' '-o' '.libs/jidctint.o' '-v' '-mtune=i486'
/usr/lib/gcc-snapshot/libexec/gcc/i486-linux-gnu/4.4.0/cc1 -quiet -v -I.
-D_REENTRANT -DPIC ./jidctint.c -quiet -dumpbase jidctint.c -mtune=i486
-auxbase-strip .libs/jidctint.o -g -g -O2 -Wall -version -fPIC -o
/tmp/cc5hqg0m.s
ignoring nonexistent directory "/usr/local/include/i486-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc-snapshot/lib/gcc/i486-linux-gnu/4.4.0/../../../../i486-linux-gnu/include"
ignoring nonexistent directory "/usr/include/i486-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
.
/usr/local/include
/usr/lib/gcc-snapshot/include
/usr/lib/gcc-snapshot/lib/gcc/i486-linux-gnu/4.4.0/include
/usr/lib/gcc-snapshot/lib/gcc/i486-linux-gnu/4.4.0/include-fixed
/usr/include
End of search list.
GNU C (Debian 20081117-1) version 4.4.0 20081117 (experimental) [trunk revision
141948] (i486-linux-gnu)
compiled by GNU C version 4.4.0 20081117 (experimental) [trunk revision
141948], GMP version 4.2.2, MPFR version 2.3.2.
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 445209552aa2d93e7e967b7473e83cd6
COLLECT_GCC_OPTIONS='-D_REENTRANT' '-g' '-Wall' '-O2' '-g' '-I.' '-c' '-fPIC'
'-DPIC' '-o' '.libs/jidctint.o' '-v' '-mtune=i486'
as -V -Qy -o .libs/jidctint.o /tmp/cc5hqg0m.s
GNU assembler version 2.18.0 (i486-linux-gnu) using BFD version (GNU Binutils
for Debian) 2.18.0.20080103
COMPILER_PATH=/usr/lib/gcc-snapshot/libexec/gcc/i486-linux-gnu/4.4.0/:/usr/lib/gcc-snapshot/libexec/gcc/i486-linux-gnu/4.4.0/:/usr/lib/gcc-snapshot/libexec/gcc/i486-linux-gnu/:/usr/lib/gcc-snapshot/lib/gcc/i486-linux-gnu/4.4.0/:/usr/lib/gcc-snapshot/lib/gcc/i486-linux-gnu/:/usr/lib/gcc/i486-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc-snapshot/lib/gcc/i486-linux-gnu/4.4.0/:/usr/lib/gcc-snapshot/lib/gcc/i486-linux-gnu/4.4.0/../../../../lib/:/lib/../lib/:/usr/lib/../lib/:/usr/lib/gcc-snapshot/lib/gcc/i486-linux-gnu/4.4.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-D_REENTRANT' '-g' '-Wall' '-O2' '-g' '-I.' '-c' '-fPIC'
'-DPIC' '-o' '.libs/jidctint.o' '-v' '-mtune=i486'
-mtune=generic still produces these long series of leas.
/* Steinar */
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38328
