cpuflags

#!/bin/sh
#
# Small script to try to find out the CPU optimisation flags.
# Based on ideas found in the NetBSD cpuflags script.
#
OS=`uname -s`

case $OS in
    FreeBSD | NetBSD)

	if [ -x /sbin/sysctl ]; then
	    SYSCTL=/sbin/sysctl
	elif [ -x /usr/sbin/sysctl ]; then
	    SYSCTL=/usr/sbin/sysctl
	elif [ -x /bin/sysctl ]; then
	    SYSCTL=/bin/sysctl
	else
	    SYSCTL=/usr/bin/sysctl
	fi

	hw_machine_arch=`$SYSCTL -n hw.machine_arch`
	hw_model=`$SYSCTL -n hw.model`

	case $hw_machine_arch in

	    alpha)
		# cpu0 at mainbus0: ID 0 (primary), 21164A-0 (unknown ...
		case "`egrep '^cpu0 ' /var/run/dmesg.boot`" in
		    *[\(\ ]2106[46][-\ \)]*)    FLAGS="-mcpu=21064"     ;;
		    *[\(\ ]21164[-\ \)]*)       FLAGS="-mcpu=21164"     ;;
		    *[\(\ ]21164A[-\ \)]*)      FLAGS="-mcpu=21164a"    ;;
		    *[\(\ ]21264B[-\ \)]*)      FLAGS="-mcpu=21264"     ;;
		esac
		;;
	    
	    i386) 
		case $hw_model in
		    *386-class*)            FLAGS='-march=i386'             ;;
		    *486-class*)            FLAGS='-march=i486'             ;;
		    *AMD\ K6*)              FLAGS='-march=k6'               ;;
		    *Pentium*)		    FLAGS='-march=pentium'          ;;
		    *586-class*)            FLAGS='-march=pentium'          ;;
		    *686-class*)            FLAGS='-march=pentiumpro'       ;;
		esac 
		;;

	    sparc | sparc64) 
		case " $hw_model" in					       # Examples
		    *[\ \(]MB86900/1A*)     FLAGS='-mcpu=cypress'           ;; # ss1+
		    *[\ \(]CY7C601*)        FLAGS='-mcpu=cypress'           ;; # ss2
		    *[\ \(]W8601/8701*)     FLAGS='-mcpu=cypress'           ;; # elc
		    *[\ \(]MB86904*)        FLAGS='-mcpu=supersparc'        ;; # ss5 usparc
		    *[\ \(]MB86907*)        FLAGS='-mcpu=supersparc'        ;; # ss5 usparc
		    *[\ \(]TMS390S10*)      FLAGS='-mcpu=supersparc'        ;; # classic  "
		    *[\ \(]TMS390Z50*)      FLAGS='-mcpu=supersparc'        ;; # ss10/ss20
		    *[\ \(]RT620/625*)      FLAGS='-mcpu=supersparc'        ;; # ss20 ross
		    *[\ \(]MB86930*)        FLAGS='-mcpu=sparclite'         ;; # from gcc
		    *[\ \(]MB86934*)        FLAGS='-mcpu=sparclite'         ;; # from gcc
		    # under 1.5.1 -mcpu=ultrasparc chokes egcs-2.91.66 compiling perl
		    *[\ \(]SUNW,UltraSPARC*) FLAGS='-mcpu=v9'               ;; # Ultra
		esac 
		;;
	
	esac
	;;

    Linux)
	hw_machine_arch=`uname -m`
	case $hw_machine_arch in
	
	    parisc)
		case "`egrep 'cpu family' /proc/cpuinfo  | cut -d ' ' -f 4`" in
		    1.0*)       FLAGS='-march=1.0'      ;;
		    1.1*)	FLAGS='-march=1.1'	;;
		    2.0*)       FLAGS='-march=2.0'      ;;
		esac
		case "`egrep 'cpu	' /proc/cpuinfo  | cut -d ' ' -f 2`" in
		    PA7100LC)   FLAGS=${FLAGS}' -mschedule=7100LC'	;;
		esac
		;;
		
	    i386)
		FLAGS='-march=i386'
		;;

	    i486)
		FLAGS='-march=i486'
		;;

	    i586)
		FLAGS='-march=pentium'
		;;

	    i686)
		FLAGS='-march=pentiumpro'
		;;

	    *)
		echo "Unsupported Linux arch $hw_machine_arch"
		exit 1
		;;
	esac
	;;

    *)
	echo "Unsupported OS $OS"
	exit 1
	;;
esac


# Fixup flags for old gcc
if [ -n "$FLAGS" ]; then
    gcc_ver=`gcc -v 2>&1 | awk '/gcc version/ {sub("egcs-","");print $3}'`
    FLAGS=`awk -v "flags=$FLAGS" -v "gcc_ver=$gcc_ver" '
	{if (gcc_ver < $1){map[$2] = ""$3}}
	END{if (flags in map) {print map[flags]}else {print flags}}
	' <<EOD
2.90    -mcpu=21164a    
2.90    -march=i386             -mno-486
2.90    -march=i486             -m486
2.90    -march=pentium          -m486
2.90    -march=pentiumpro       -m486
2.90    -mcpu=supersparc        -msupersparc
2.90    -mcpu=sparclite         -msparclite
2.90    -mcpu=cypress           -mcypress
2.90    -mcpu=v9                -mv8
2.90    -mcpu=arm610            -m6
2.90    -mcpu=strongarm110      -m6
2.90    -mcpu=arm710            -m6
2.95    -march=k6               -march=pentium
EOD
`
fi

echo $FLAGS

exit 0