#!/bin/sh # Print the gcc cpu specific options appropriate for the current CPU # Author: # http://www.pixelbeat.org/ # Notes: # This script currently supports Linux,FreeBSD,Cygwin # This script is x86 (32 bit) specific # It should work on any gcc >= 2.95 at least # It only returns CPU specific options. You probably also want -03 etc. # Changes: # V0.1, 12 Mar 2003, Initial release # V0.2, 01 Jun 2005, Added support for 3.2>=gcc<=4.0 # V0.3, 03 Jun 2005, Added support for pentium-m # V0.4, 03 Jun 2005, Fix silly bugs # V0.5, 07 Jun 2005, Clarify/Simplify confusing floating point expr usage # Print warning when CPU only supported on a newer gcc # V0.6, 15 Dec 2006, Added support for Intel Core and Core 2 processors # Added support for 4.1>=gcc<=4.3 # Added support for gcc -msse3 option # Added support for new gcc -march=native option # V0.7, 18 Dec 2006, Changes from Conor McDermottroe # Added support for FreeBSD # Remove bash specific constructs # Better error handling # V0.8, 19 Dec 2006, Give warnings and 32 bit -march on 64 bit platforms. # Previously it just gave an invalid blank -march. # Reported and tested by Ewan Oughton. # V0.9, 30 Apr 2007, Give error if compiler not present. # Warn about rather than default to -march=native option. # V0.92, 08 Nov 2007, Change from Krzysztof Jankowski to support Cygwin. # Added support for AMD family 10 processors. # Add support for gcc -msse4 & -msse5 options. # Use "prescott" rather than "pentium4" for all # models >= 3 in intel family 15, not just model 3. # V0.93, 13 Nov 2007, Oops, actually not all intel family 15, model >= 3 # are prescotts. Use the sse3 flag to distinguish. # V0.94, 31 Dec 2007, Oops, actually all intel family 15, model >= 3 # are prescotts. This was indicated by Adam Drzewiecki. # I was confused by a bug in older linux kernels where pni # was not reported for my intel "F41" processor at least. # V0.95, 18 Jan 2008, Changes from Conor McDermottroe # Support for Mac OS X # Support for FreeBSD base system if [ "$1" = "--version" ]; then echo "0.95" && exit fi # This table shows when -march options were introduced into _official_ gcc releases. # Note there are vendor deviations that complicate this. # For e.g. redhat introduced the prescott option in 3.3-13. # gcc-2.95 = i386, i486, i586,pentium, i686,pentiumpro, k6 # gcc-3.0 += athlon # gcc-3.1 += pentium-mmx, pentium2, pentium3, pentium4, k6-2, k6-3, athlon-{tbird, 4,xp,mp} # gcc-3.3 += winchip-c6, winchip2, c3 # gcc-3.4.0 += k8,opteron,athlon64,athlon-fx, c3-2 # gcc-3.4.1 += pentium-m, pentium3m, pentium4m, prescott, nocona # gcc-4.3 += core2, amdfam10 [ -z "$CC" ] && CC=gcc try_gcc_options() { $CC $* -S -o /dev/null -xc /dev/null >/dev/null 2>&1 } if ! try_gcc_options; then echo "Error: Couldn't execute your compiler ($CC)" >&2 exit 1 fi if try_gcc_options -march=native; then echo "Warning: Your compiler supports the -march=native option which you may prefer" >&2 fi if ! try_gcc_options -march=i386; then if ! try_gcc_options -m32 -march=i386; then echo "Error: This script only supports 32 bit x86 architectures" >&2 exit 1 else echo "Warning: The optimum *32 bit* architecture is reported" >&2 m32="-m32 " fi fi try_line() { skip=0 for arch in $1; do if try_gcc_options $m32 -march=$arch; then echo $arch return elif [ "$skip" = "0" ] && [ "$arch" != "native" ]; then skip=1 echo "Warning: Newer versions of GCC better support your CPU with -march=$arch" >&2 fi done return 1 } read_cpu_data_linux() { 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" break #flags last so break early fi done < /proc/cpuinfo unset IFS } read_cpu_data_freebsd() { local _line _cpu_id if [ ! -r /var/run/dmesg.boot ]; then echo "/var/run/dmesg.boot does not exist!" exit 1; fi IFS=" " for _line in `grep -A2 '^CPU: ' /var/run/dmesg.boot`; do if [ -n "`echo $_line | grep '^ Origin = '`" ]; then vendor_id="`echo $_line | sed -e 's/^ Origin = .//' -e 's/[^A-Za-z0-9].*$//'`" _cpu_id="`echo $_line | sed -e 's/^.*Id = //' -e 's/ .*$//' -e 'y/abcdef/ABCDEF/'`" cpu_family=$((($_cpu_id & 0xF0F) >> 8)) cpu_model=$((($_cpu_id & 0xF0) >> 4)) fi if [ -n "`echo $_line | grep '^ Features='`" ]; then flags="`echo $_line | sed -e 's/^.*.*//' -e 's/,/ /g' | tr 'A-Z' 'a-z'`" fi done unset IFS } read_cpu_data_darwin() { vendor_id="`/usr/sbin/sysctl -n machdep.cpu.vendor`" cpu_family="`/usr/sbin/sysctl -n machdep.cpu.family`" cpu_model="`/usr/sbin/sysctl -n machdep.cpu.model`" flags="`/usr/sbin/sysctl -n machdep.cpu.features | tr 'A-Z' 'a-z'`" } read_cpu_data() { # Default values vendor_id="Unset" cpu_family="-1" cpu_model="-1" flags="" if [ "`uname`" = "Linux" ]; then read_cpu_data_linux elif [ "`uname`" = "FreeBSD" ]; then read_cpu_data_freebsd elif [ "`uname | sed 's/\(CYGWIN\).*/\1/'`" = "CYGWIN" ]; then read_cpu_data_linux elif [ "`uname`" = "Darwin" ]; then read_cpu_data_darwin else echo "Error: `uname` is not a supported operating system" exit 1 fi } read_cpu_data if [ "$vendor_id" = "AuthenticAMD" ]; then if [ $cpu_family -eq 4 ]; then _CFLAGS="-march=i486" elif [ $cpu_family -eq 5 ]; then if [ $cpu_model -lt 4 ]; then _CFLAGS="-march=pentium" elif [ \( $cpu_model -eq 6 \) -o \( $cpu_model -eq 7 \) ]; then _CFLAGS="-march=k6" elif [ \( $cpu_model -eq 8 \) -o \( $cpu_model -eq 12 \) ]; then line="k6-2 k6" elif [ \( $cpu_model -eq 9 \) -o \( $cpu_model -eq 13 \) ]; then line="k6-3 k6-2 k6" fi elif [ $cpu_family -eq 6 ]; then if [ $cpu_model -le 3 ]; then line="athlon k6-3 k6-2 k6" elif [ $cpu_model -eq 4 ]; then line="athlon-tbird athlon k6-3 k6-2 k6" elif [ $cpu_model -ge 6 ]; then #athlon-{4,xp,mp} line="athlon-4 athlon k6-3 k6-2 k6" fi elif [ $cpu_family -eq 15 ]; then #k8,opteron,athlon64,athlon-fx line="k8 athlon-4 athlon k6-3 k6-2 k6" elif [ $cpu_family -eq 16 ]; then #barcelona,amdfam10 line="amdfam10 k8 athlon-4 athlon k6-3 k6-2 k6" fi elif [ "$vendor_id" = "CentaurHauls" ]; then if [ $cpu_family -eq 5 ]; then if [ $cpu_model -eq 4 ]; then line="winchip-c6 pentium" elif [ $cpu_model -eq 8 ]; then line="winchip2 winchip-c6 pentium" elif [ $cpu_model -ge 9 ]; then line="winchip2 winchip-c6 pentium" #actually winchip3 but gcc doesn't support this currently fi elif [ $cpu_family -eq 6 ]; then if echo "$flags" | grep -q cmov; then fallback=pentiumpro else fallback=pentium #gcc incorrectly assumes i686 always has cmov fi if [ $cpu_model -eq 6 ]; then _CFLAGS="-march=pentium" # ? Cyrix 3 (samuel) elif [ $cpu_model -eq 7 ] || [ $cpu_model -eq 8 ]; then line="c3 winchip2 winchip-c6 $fallback" elif [ $cpu_model -ge 9 ]; then line="c3-2 c3 winchip2 winchip-c6 $fallback" fi fi elif [ "$vendor_id" = "GenuineIntel" ]; then if [ $cpu_family -eq 3 ]; then _CFLAGS="-march=i386" elif [ $cpu_family -eq 4 ]; then _CFLAGS="-march=i486" elif [ $cpu_family -eq 5 ]; then if [ $cpu_model -ne 4 ]; then _CFLAGS="-march=pentium" else line="pentium-mmx pentium" #No overlap with other vendors fi elif [ $cpu_family -eq 6 ]; then if [ \( $cpu_model -eq 0 \) -o \( $cpu_model -eq 1 \) ]; then _CFLAGS="-march=pentiumpro" elif [ \( $cpu_model -ge 3 \) -a \( $cpu_model -le 6 \) ]; then #4=TM5600 at least line="pentium2 pentiumpro pentium-mmx pentium i486 i386" elif [ \( $cpu_model -eq 9 \) -o \( $cpu_model -eq 13 \) ]; then #centrino line="pentium-m pentium4 pentium3 pentium2 pentiumpro pentium-mmx pentium i486 i386" elif [ $cpu_model -eq 14 ]; then #Core line="prescott pentium-m pentium4 pentium3 pentium2 pentiumpro pentium-mmx pentium i486 i386" elif [ $cpu_model -eq 15 ]; then #Core 2 line="core2 pentium-m pentium4 pentium3 pentium2 pentiumpro pentium-mmx pentium i486 i386" elif [ \( $cpu_model -ge 7 \) -a \( $cpu_model -le 11 \) ]; then line="pentium3 pentium2 pentiumpro pentium-mmx pentium i486 i386" fi elif [ $cpu_family -eq 15 ]; then line="pentium4 pentium3 pentium2 pentiumpro pentium-mmx pentium i486 i386" if [ $cpu_model -ge 3 ]; then line="prescott $line" fi fi else echo "Unknown CPU Vendor: $vendor_id" exit 1 fi [ -z "$_CFLAGS" ] && _CFLAGS="-march=`try_line "$line"`" #SSE is not used for floating point by default in gcc 32 bit #so turn that on here. if echo "$flags" | grep -q "sse"; then if try_gcc_options "-mfpmath=sse"; then #gcc >= 3.1 _CFLAGS="$_CFLAGS -mfpmath=sse" fi fi #The SSE options are mostly selected automatically #when a particular march option is selected. #There are a few exceptions unfortunately, which we handle here. #Note the sse instruction lines are: # intel: [sse4.2] [sse4.1] ssse3 sse3 sse2 sse ... # amd: [sse5] sse4a [sse3] sse2 sse ... # The bracketed ones are only available on some cpus # in a particular family and so need to be added explicitly. if echo "$_CFLAGS" | grep -q "amdfam10"; then if echo "$flags" | grep -q "sse5"; then if try_gcc_options "-msse5"; then #gcc >= 4.3 _CFLAGS="$_CFLAGS -msse5" fi fi elif echo "$_CFLAGS" | grep -E -q "(k8|c3-2)"; then if echo "$flags" | grep -E -q "(sse3|pni)"; then if try_gcc_options "-msse3"; then #gcc >= 3.3.3 _CFLAGS="$_CFLAGS -msse3" fi fi elif echo "$_CFLAGS" | grep -q "core2"; then if echo "$flags" | grep -q "sse4_2"; then if try_gcc_options "-msse4"; then #gcc >= 4.3 _CFLAGS="$_CFLAGS -msse4" fi elif echo "$flags" | grep -q "sse4_1"; then if try_gcc_options "-msse4.1"; then #gcc >= 4.3 _CFLAGS="$_CFLAGS -msse4.1" fi fi fi echo "$m32$_CFLAGS"