ax_gcc_archflag.m4 (8986B)
1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_GCC_ARCHFLAG([PORTABLE?], [ACTION-SUCCESS], [ACTION-FAILURE]) 8# 9# DESCRIPTION 10# 11# This macro tries to guess the "native" arch corresponding to the target 12# architecture for use with gcc's -march=arch or -mtune=arch flags. If 13# found, the cache variable $ax_cv_gcc_archflag is set to this flag and 14# ACTION-SUCCESS is executed; otherwise $ax_cv_gcc_archflag is is set to 15# "unknown" and ACTION-FAILURE is executed. The default ACTION-SUCCESS is 16# to add $ax_cv_gcc_archflag to the end of $CFLAGS. 17# 18# PORTABLE? should be either [yes] (default) or [no]. In the former case, 19# the flag is set to -mtune (or equivalent) so that the architecture is 20# only used for tuning, but the instruction set used is still portable. In 21# the latter case, the flag is set to -march (or equivalent) so that 22# architecture-specific instructions are enabled. 23# 24# The user can specify --with-gcc-arch=<arch> in order to override the 25# macro's choice of architecture, or --without-gcc-arch to disable this. 26# 27# When cross-compiling, or if $CC is not gcc, then ACTION-FAILURE is 28# called unless the user specified --with-gcc-arch manually. 29# 30# Requires macros: AX_CHECK_COMPILER_FLAGS, AX_GCC_X86_CPUID 31# 32# (The main emphasis here is on recent CPUs, on the principle that doing 33# high-performance computing on old hardware is uncommon.) 34# 35# LICENSE 36# 37# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu> 38# Copyright (c) 2008 Matteo Frigo 39# 40# This program is free software: you can redistribute it and/or modify it 41# under the terms of the GNU General Public License as published by the 42# Free Software Foundation, either version 3 of the License, or (at your 43# option) any later version. 44# 45# This program is distributed in the hope that it will be useful, but 46# WITHOUT ANY WARRANTY; without even the implied warranty of 47# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 48# Public License for more details. 49# 50# You should have received a copy of the GNU General Public License along 51# with this program. If not, see <http://www.gnu.org/licenses/>. 52# 53# As a special exception, the respective Autoconf Macro's copyright owner 54# gives unlimited permission to copy, distribute and modify the configure 55# scripts that are the output of Autoconf when processing the Macro. You 56# need not follow the terms of the GNU General Public License when using 57# or distributing such scripts, even though portions of the text of the 58# Macro appear in them. The GNU General Public License (GPL) does govern 59# all other use of the material that constitutes the Autoconf Macro. 60# 61# This special exception to the GPL applies to versions of the Autoconf 62# Macro released by the Autoconf Archive. When you make and distribute a 63# modified version of the Autoconf Macro, you may extend this special 64# exception to the GPL to apply to your modified version as well. 65 66#serial 8 67 68AC_DEFUN([AX_GCC_ARCHFLAG], 69[AC_REQUIRE([AC_PROG_CC]) 70AC_REQUIRE([AC_CANONICAL_HOST]) 71 72AC_ARG_WITH(gcc-arch, [AS_HELP_STRING([--with-gcc-arch=<arch>], [use architecture <arch> for gcc -march/-mtune, instead of guessing])], 73 ax_gcc_arch=$withval, ax_gcc_arch=yes) 74 75AC_MSG_CHECKING([for gcc architecture flag]) 76AC_MSG_RESULT([]) 77AC_CACHE_VAL(ax_cv_gcc_archflag, 78[ 79ax_cv_gcc_archflag="unknown" 80 81if test "$GCC" = yes; then 82 83if test "x$ax_gcc_arch" = xyes; then 84ax_gcc_arch="" 85if test "$cross_compiling" = no; then 86case $host_cpu in 87 i[[3456]]86*|x86_64*) # use cpuid codes, in part from x86info-1.7 by D. Jones 88 AX_GCC_X86_CPUID(0) 89 AX_GCC_X86_CPUID(1) 90 case $ax_cv_gcc_x86_cpuid_0 in 91 *:756e6547:*:*) # Intel 92 case $ax_cv_gcc_x86_cpuid_1 in 93 *5[[48]]?:*:*:*) ax_gcc_arch="pentium-mmx pentium" ;; 94 *5??:*:*:*) ax_gcc_arch=pentium ;; 95 *6[[3456]]?:*:*:*) ax_gcc_arch="pentium2 pentiumpro" ;; 96 *6a?:*[[01]]:*:*) ax_gcc_arch="pentium2 pentiumpro" ;; 97 *6a?:*[[234]]:*:*) ax_gcc_arch="pentium3 pentiumpro" ;; 98 *6[[9d]]?:*:*:*) ax_gcc_arch="pentium-m pentium3 pentiumpro" ;; 99 *6[[78b]]?:*:*:*) ax_gcc_arch="pentium3 pentiumpro" ;; 100 *6??:*:*:*) ax_gcc_arch=pentiumpro ;; 101 *f3[[347]]:*:*:*|*f4[1347]:*:*:*) 102 case $host_cpu in 103 x86_64*) ax_gcc_arch="nocona pentium4 pentiumpro" ;; 104 *) ax_gcc_arch="prescott pentium4 pentiumpro" ;; 105 esac ;; 106 *f??:*:*:*) ax_gcc_arch="pentium4 pentiumpro";; 107 esac ;; 108 *:68747541:*:*) # AMD 109 case $ax_cv_gcc_x86_cpuid_1 in 110 *5[[67]]?:*:*:*) ax_gcc_arch=k6 ;; 111 *5[[8d]]?:*:*:*) ax_gcc_arch="k6-2 k6" ;; 112 *5[[9]]?:*:*:*) ax_gcc_arch="k6-3 k6" ;; 113 *60?:*:*:*) ax_gcc_arch=k7 ;; 114 *6[[12]]?:*:*:*) ax_gcc_arch="athlon k7" ;; 115 *6[[34]]?:*:*:*) ax_gcc_arch="athlon-tbird k7" ;; 116 *67?:*:*:*) ax_gcc_arch="athlon-4 athlon k7" ;; 117 *6[[68a]]?:*:*:*) 118 AX_GCC_X86_CPUID(0x80000006) # L2 cache size 119 case $ax_cv_gcc_x86_cpuid_0x80000006 in 120 *:*:*[[1-9a-f]]??????:*) # (L2 = ecx >> 16) >= 256 121 ax_gcc_arch="athlon-xp athlon-4 athlon k7" ;; 122 *) ax_gcc_arch="athlon-4 athlon k7" ;; 123 esac ;; 124 *f[[4cef8b]]?:*:*:*) ax_gcc_arch="athlon64 k8" ;; 125 *f5?:*:*:*) ax_gcc_arch="opteron k8" ;; 126 *f7?:*:*:*) ax_gcc_arch="athlon-fx opteron k8" ;; 127 *f??:*:*:*) ax_gcc_arch="k8" ;; 128 esac ;; 129 *:746e6543:*:*) # IDT 130 case $ax_cv_gcc_x86_cpuid_1 in 131 *54?:*:*:*) ax_gcc_arch=winchip-c6 ;; 132 *58?:*:*:*) ax_gcc_arch=winchip2 ;; 133 *6[[78]]?:*:*:*) ax_gcc_arch=c3 ;; 134 *69?:*:*:*) ax_gcc_arch="c3-2 c3" ;; 135 esac ;; 136 esac 137 if test x"$ax_gcc_arch" = x; then # fallback 138 case $host_cpu in 139 i586*) ax_gcc_arch=pentium ;; 140 i686*) ax_gcc_arch=pentiumpro ;; 141 esac 142 fi 143 ;; 144 145 sparc*) 146 AC_PATH_PROG([PRTDIAG], [prtdiag], [prtdiag], [$PATH:/usr/platform/`uname -i`/sbin/:/usr/platform/`uname -m`/sbin/]) 147 cputype=`(((grep cpu /proc/cpuinfo | cut -d: -f2) ; ($PRTDIAG -v |grep -i sparc) ; grep -i cpu /var/run/dmesg.boot ) | head -n 1) 2> /dev/null` 148 cputype=`echo "$cputype" | tr -d ' -' |tr $as_cr_LETTERS $as_cr_letters` 149 case $cputype in 150 *ultrasparciv*) ax_gcc_arch="ultrasparc4 ultrasparc3 ultrasparc v9" ;; 151 *ultrasparciii*) ax_gcc_arch="ultrasparc3 ultrasparc v9" ;; 152 *ultrasparc*) ax_gcc_arch="ultrasparc v9" ;; 153 *supersparc*|*tms390z5[[05]]*) ax_gcc_arch="supersparc v8" ;; 154 *hypersparc*|*rt62[[056]]*) ax_gcc_arch="hypersparc v8" ;; 155 *cypress*) ax_gcc_arch=cypress ;; 156 esac ;; 157 158 alphaev5) ax_gcc_arch=ev5 ;; 159 alphaev56) ax_gcc_arch=ev56 ;; 160 alphapca56) ax_gcc_arch="pca56 ev56" ;; 161 alphapca57) ax_gcc_arch="pca57 pca56 ev56" ;; 162 alphaev6) ax_gcc_arch=ev6 ;; 163 alphaev67) ax_gcc_arch=ev67 ;; 164 alphaev68) ax_gcc_arch="ev68 ev67" ;; 165 alphaev69) ax_gcc_arch="ev69 ev68 ev67" ;; 166 alphaev7) ax_gcc_arch="ev7 ev69 ev68 ev67" ;; 167 alphaev79) ax_gcc_arch="ev79 ev7 ev69 ev68 ev67" ;; 168 169 powerpc*) 170 cputype=`((grep cpu /proc/cpuinfo | head -n 1 | cut -d: -f2 | cut -d, -f1 | sed 's/ //g') ; /usr/bin/machine ; /bin/machine; grep CPU /var/run/dmesg.boot | head -n 1 | cut -d" " -f2) 2> /dev/null` 171 cputype=`echo $cputype | sed -e 's/ppc//g;s/ *//g'` 172 case $cputype in 173 *750*) ax_gcc_arch="750 G3" ;; 174 *740[[0-9]]*) ax_gcc_arch="$cputype 7400 G4" ;; 175 *74[[4-5]][[0-9]]*) ax_gcc_arch="$cputype 7450 G4" ;; 176 *74[[0-9]][[0-9]]*) ax_gcc_arch="$cputype G4" ;; 177 *970*) ax_gcc_arch="970 G5 power4";; 178 *POWER4*|*power4*|*gq*) ax_gcc_arch="power4 970";; 179 *POWER5*|*power5*|*gr*|*gs*) ax_gcc_arch="power5 power4 970";; 180 603ev|8240) ax_gcc_arch="$cputype 603e 603";; 181 *) ax_gcc_arch=$cputype ;; 182 esac 183 ax_gcc_arch="$ax_gcc_arch powerpc" 184 ;; 185esac 186fi # not cross-compiling 187fi # guess arch 188 189if test "x$ax_gcc_arch" != x -a "x$ax_gcc_arch" != xno; then 190for arch in $ax_gcc_arch; do 191 if test "x[]m4_default([$1],yes)" = xyes; then # if we require portable code 192 flags="-mtune=$arch" 193 # -mcpu=$arch and m$arch generate nonportable code on every arch except 194 # x86. And some other arches (e.g. Alpha) don't accept -mtune. Grrr. 195 case $host_cpu in i*86|x86_64*) flags="$flags -mcpu=$arch -m$arch";; esac 196 else 197 flags="-march=$arch -mcpu=$arch -m$arch" 198 fi 199 for flag in $flags; do 200 AX_CHECK_COMPILER_FLAGS($flag, [ax_cv_gcc_archflag=$flag; break]) 201 done 202 test "x$ax_cv_gcc_archflag" = xunknown || break 203done 204fi 205 206fi # $GCC=yes 207]) 208AC_MSG_CHECKING([for gcc architecture flag]) 209AC_MSG_RESULT($ax_cv_gcc_archflag) 210if test "x$ax_cv_gcc_archflag" = xunknown; then 211 m4_default([$3],:) 212else 213 m4_default([$2], [CFLAGS="$CFLAGS $ax_cv_gcc_archflag"]) 214fi 215])