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