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Just Modeste
n00b
Joined: 08 Nov 2002
Posts: 14
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 Posted: Wed Dec 03, 2003 3:51 pm Post subject: Astuce: Une mise en forme peut etre appliquee au texte selec |
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Bonjour a tous,
Voila, j'aimerai savoir comment optimiser les parametres CFLAGS dans le fichier /etc/make.conf.
J'ai trouve sur le site www.freehackers.org/gentoo/gccflags/flags-gcc3.html les parametres a utiliser. Pour ma machine (pentiumIII) j'ai donc :
CFLAGS="-march=pentium3 -O3 -pipe -fomit-frame-pointer"
Par contre, en voulant utiliser le stage3, j'avais plutot :
CFLAGS="-O3 -march=pentium3 -fprefetch-loop-arrays -funroll-loops -pipe"
D'ou ma question de savoir quels sont les meilleurs parametres ?
Merci pour vos reponse.
_________________
"Parce que la connaissance ne vaut que losrqu'elle est partagée."
Just Modeste. |
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px
Guru
Joined: 26 Sep 2002
Posts: 497
Location: Metz, France
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| Posted: Thu Dec 04, 2003 9:11 pm Post subject: |
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cree un nouveau fichier appelé gcccpuopt.sh qui contient:
| Code: |
#!/bin/sh
# Author: pixelbeat
#This script is Linux specific
#It should work on any gcc >= 2.95 at least
#these apply to any arch (just here for reference)
unsafe_math_opts="-ffast-math -fno-math-errno -funsafe-math-optimizations -fno-trapping-math"
gcc_version=`gcc -dumpversion | sed 's/\([0-9]\{1,\}\.[0-9]\{1,\}\)\.*\([0-9]\{1,\}\)\{0,1\}/\1\2/'`
IFS=":"
while read name value; do
unset IFS
name=`echo $name`
value=`echo $value`
IFS=":"
if [ "$name" == "vendor_id" ]; then
vendor_id="$value"
elif [ "$name" == "cpu family" ]; then
cpu_family="$value"
elif [ "$name" == "model" ]; then
cpu_model="$value"
elif [ "$name" == "flags" ]; then
flags="$value"
fi
done < /proc/cpuinfo
unset IFS
if [ "$vendor_id" == "AuthenticAMD" ]; then
if [ "$cpu_family" == "4" ]; then
_CFLAGS="$_CFLAGS -march=i486"
elif [ "$cpu_family" == "5" ]; then
if [ "$cpu_model" -lt "4" ]; then
_CFLAGS="$_CFLAGS -march=pentium"
elif [ "$cpu_model" == "6" ] || [ "$cpu_model" == "7" ]; then
_CFLAGS="$_CFLAGS -march=k6"
elif [ "$cpu_model" == "8" ] || [ "$cpu_model" == "12" ]; then
if expr $gcc_version '>=' 3.1 >/dev/null; then
_CFLAGS="$_CFLAGS -march=k6-2"
else
_CFLAGS="$_CFLAGS -march=k6"
fi
elif [ "$cpu_model" == "9" ] || [ "$cpu_model" == "13" ]; then
if expr $gcc_version '>=' 3.1 >/dev/null; then
_CFLAGS="$_CFLAGS -march=k6-3"
else
_CFLAGS="$_CFLAGS -march=k6"
fi
fi
elif [ "$cpu_family" == "6" ]; then
if [ "$cpu_model" -le "3" ]; then
if expr $gcc_version '>=' 3.0 >/dev/null; then
_CFLAGS="$_CFLAGS -march=athlon"
else
_CFLAGS="$_CFLAGS -march=k6"
fi
elif [ "$cpu_model" == "4" ]; then
if expr $gcc_version '>=' 3.1 >/dev/null; then
_CFLAGS="$_CFLAGS -march=athlon-tbird"
elif expr $gcc_version '>=' 3.0 >/dev/null; then
_CFLAGS="$_CFLAGS -march=athlon"
else
_CFLAGS="$_CFLAGS -march=k6"
fi
elif [ "$cpu_model" -ge "6" ]; then #athlon-{4,xp,mp}
if expr $gcc_version '>=' 3.1 >/dev/null; then
_CFLAGS="$_CFLAGS -march=athlon-xp"
elif expr $gcc_version '>=' 3.0 >/dev/null; then
_CFLAGS="$_CFLAGS -march=athlon"
else
_CFLAGS="$_CFLAGS -march=k6"
fi
fi
fi
else #everything else "GenuineIntel"
if [ "$cpu_family" == "3" ]; then
_CFLAGS="$_CFLAGS -march=i386"
elif [ "$cpu_family" == "4" ]; then
_CFLAGS="$_CFLAGS -march=i486"
elif [ "$cpu_family" == "5" ] && expr $gcc_version '<' 3.1 >/dev/null; then
_CFLAGS="$_CFLAGS -march=pentium"
elif [ "$cpu_family" -ge "6" ] && expr $gcc_version '<' 3.1 >/dev/null; then
_CFLAGS="$_CFLAGS -march=pentiumpro"
elif [ "$cpu_family" == "5" ]; then
if [ "$cpu_model" != "4" ]; then
_CFLAGS="$_CFLAGS -march=pentium"
else
_CFLAGS="$_CFLAGS -march=pentium-mmx" #No overlap with other vendors
fi
elif [ "$cpu_family" == "6" ]; then
if echo "$flags" | grep -vq cmov; then #gcc incorrectly assumes i686 always has cmov
_CFLAGS="$_CFLAGS -march=pentium -mcpu=pentiumpro" #VIA CPUs exhibit this
else
if [ "$cpu_model" == "0" ] || [ "$cpu_model" == "1" ]; then
_CFLAGS="$_CFLAGS -march=pentiumpro"
elif [ "$cpu_model" -ge "3" ] && [ "$cpu_model" -le "6" ]; then #4=TM5600 at least
_CFLAGS="$_CFLAGS -march=pentium2"
elif [ "$cpu_model" -ge "7" ] && [ "$cpu_model" -le "11" ]; then #9 invalid
_CFLAGS="$_CFLAGS -march=pentium3"
fi
fi
elif [ "$cpu_family" == "15" ]; then
_CFLAGS="$_CFLAGS -march=pentium4"
fi
fi
if expr $gcc_version '>=' 3.1 >/dev/null; then
if echo "$flags" | grep -q sse2; then
_CFLAGS="$_CFLAGS -mfpmath=sse -msse2"
elif echo "$flags" | grep -q sse; then
_CFLAGS="$_CFLAGS -mfpmath=sse -msse"
fi
if echo "$flags" | grep -q mmx; then
_CFLAGS="$_CFLAGS -mmmx"
fi
if echo "$flags" | grep -q 3dnow; then
_CFLAGS="$_CFLAGS -m3dnow"
fi
fi
echo "$_CFLAGS"
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ensuite sauve le et fait chmod +x gcccpuopt.sh
puis ./gcccpuopt.sh
ca devrait te sortir les flags... Je sais plus où j'ai trouvé je l'ai trouvé, y'a peut etre une nouvelle version, faut juste la trouver avec un bon moteur de recherche
_________________
Nous autres, mordus d'informatique, préférons par-dessus tout passer notre temps à bidouiller nos ordinateurs, plutôt que les utiliser pour faire quelque chose de productif. [Dave Barry] |
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cylgalad
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Joined: 18 Apr 2003
Posts: 1327
Location: France
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French
lis :