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# ===========================================================================
# http://autoconf-archive.cryp.to/ax_gcc_archflag.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_GCC_ARCHFLAG([PORTABLE?], [ACTION-SUCCESS], [ACTION-FAILURE])
#
# DESCRIPTION
#
# This macro tries to guess the "native" arch corresponding to the target
# architecture for use with gcc's -march=arch or -mtune=arch flags. If
# found, the cache variable $ax_cv_gcc_archflag is set to this flag and
# ACTION-SUCCESS is executed; otherwise $ax_cv_gcc_archflag is is set to
# "unknown" and ACTION-FAILURE is executed. The default ACTION-SUCCESS is
# to add $ax_cv_gcc_archflag to the end of $CFLAGS.
#
# PORTABLE? should be either [yes] (default) or [no]. In the former case,
# the flag is set to -mtune (or equivalent) so that the architecture is
# only used for tuning, but the instruction set used is still portable. In
# the latter case, the flag is set to -march (or equivalent) so that
# architecture-specific instructions are enabled.
#
# The user can specify --with-gcc-arch=<arch> in order to override the
# macro's choice of architecture, or --without-gcc-arch to disable this.
#
# When cross-compiling, or if $CC is not gcc, then ACTION-FAILURE is
# called unless the user specified --with-gcc-arch manually.
#
# Requires macros: AX_CHECK_COMPILER_FLAGS, AX_GCC_X86_CPUID
#
# (The main emphasis here is on recent CPUs, on the principle that doing
# high-performance computing on old hardware is uncommon.)
#
# LAST MODIFICATION
#
# 2008-04-12
#
# COPYLEFT
#
# Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
# Copyright (c) 2008 Matteo Frigo
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Macro Archive. When you make and
# distribute a modified version of the Autoconf Macro, you may extend this
# special exception to the GPL to apply to your modified version as well.
AC_DEFUN([AX_GCC_ARCHFLAG],
[AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST])
AC_ARG_WITH(gcc-arch, [AC_HELP_STRING([--with-gcc-arch=<arch>], [use architecture <arch> for gcc -march/-mtune, instead of guessing])],
ax_gcc_arch=$withval, ax_gcc_arch=yes)
AC_MSG_CHECKING([for gcc architecture flag])
AC_MSG_RESULT([])
AC_CACHE_VAL(ax_cv_gcc_archflag,
[
ax_cv_gcc_archflag="unknown"
if test "$GCC" = yes; then
if test "x$ax_gcc_arch" = xyes; then
ax_gcc_arch=""
if test "$cross_compiling" = no; then
case $host_cpu in
i[[3456]]86*|x86_64*) # use cpuid codes, in part from x86info-1.7 by D. Jones
AX_GCC_X86_CPUID(0)
AX_GCC_X86_CPUID(1)
case $ax_cv_gcc_x86_cpuid_0 in
*:756e6547:*:*) # Intel
case $ax_cv_gcc_x86_cpuid_1 in
*5[[48]]?:*:*:*) ax_gcc_arch="pentium-mmx pentium" ;;
*5??:*:*:*) ax_gcc_arch=pentium ;;
*6[[3456]]?:*:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
*6a?:*[[01]]:*:*) ax_gcc_arch="pentium2 pentiumpro" ;;
*6a?:*[[234]]:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
*6[[9d]]?:*:*:*) ax_gcc_arch="pentium-m pentium3 pentiumpro" ;;
*6[[78b]]?:*:*:*) ax_gcc_arch="pentium3 pentiumpro" ;;
*6??:*:*:*) ax_gcc_arch=pentiumpro ;;
*f3[[347]]:*:*:*|*f4[1347]:*:*:*)
case $host_cpu in
x86_64*) ax_gcc_arch="nocona pentium4 pentiumpro" ;;
*) ax_gcc_arch="prescott pentium4 pentiumpro" ;;
esac ;;
*f??:*:*:*) ax_gcc_arch="pentium4 pentiumpro";;
esac ;;
*:68747541:*:*) # AMD
case $ax_cv_gcc_x86_cpuid_1 in
*5[[67]]?:*:*:*) ax_gcc_arch=k6 ;;
*5[[8d]]?:*:*:*) ax_gcc_arch="k6-2 k6" ;;
*5[[9]]?:*:*:*) ax_gcc_arch="k6-3 k6" ;;
*60?:*:*:*) ax_gcc_arch=k7 ;;
*6[[12]]?:*:*:*) ax_gcc_arch="athlon k7" ;;
*6[[34]]?:*:*:*) ax_gcc_arch="athlon-tbird k7" ;;
*67?:*:*:*) ax_gcc_arch="athlon-4 athlon k7" ;;
*6[[68a]]?:*:*:*)
AX_GCC_X86_CPUID(0x80000006) # L2 cache size
case $ax_cv_gcc_x86_cpuid_0x80000006 in
*:*:*[[1-9a-f]]??????:*) # (L2 = ecx >> 16) >= 256
ax_gcc_arch="athlon-xp athlon-4 athlon k7" ;;
*) ax_gcc_arch="athlon-4 athlon k7" ;;
esac ;;
*f[[4cef8b]]?:*:*:*) ax_gcc_arch="athlon64 k8" ;;
*f5?:*:*:*) ax_gcc_arch="opteron k8" ;;
*f7?:*:*:*) ax_gcc_arch="athlon-fx opteron k8" ;;
*f??:*:*:*) ax_gcc_arch="k8" ;;
esac ;;
*:746e6543:*:*) # IDT
case $ax_cv_gcc_x86_cpuid_1 in
*54?:*:*:*) ax_gcc_arch=winchip-c6 ;;
*58?:*:*:*) ax_gcc_arch=winchip2 ;;
*6[[78]]?:*:*:*) ax_gcc_arch=c3 ;;
*69?:*:*:*) ax_gcc_arch="c3-2 c3" ;;
esac ;;
esac
if test x"$ax_gcc_arch" = x; then # fallback
case $host_cpu in
i586*) ax_gcc_arch=pentium ;;
i686*) ax_gcc_arch=pentiumpro ;;
esac
fi
;;
sparc*)
AC_PATH_PROG([PRTDIAG], [prtdiag], [prtdiag], [$PATH:/usr/platform/`uname -i`/sbin/:/usr/platform/`uname -m`/sbin/])
cputype=`(((grep cpu /proc/cpuinfo | cut -d: -f2) ; ($PRTDIAG -v |grep -i sparc) ; grep -i cpu /var/run/dmesg.boot ) | head -n 1) 2> /dev/null`
cputype=`echo "$cputype" | tr -d ' -' |tr $as_cr_LETTERS $as_cr_letters`
case $cputype in
*ultrasparciv*) ax_gcc_arch="ultrasparc4 ultrasparc3 ultrasparc v9" ;;
*ultrasparciii*) ax_gcc_arch="ultrasparc3 ultrasparc v9" ;;
*ultrasparc*) ax_gcc_arch="ultrasparc v9" ;;
*supersparc*|*tms390z5[[05]]*) ax_gcc_arch="supersparc v8" ;;
*hypersparc*|*rt62[[056]]*) ax_gcc_arch="hypersparc v8" ;;
*cypress*) ax_gcc_arch=cypress ;;
esac ;;
alphaev5) ax_gcc_arch=ev5 ;;
alphaev56) ax_gcc_arch=ev56 ;;
alphapca56) ax_gcc_arch="pca56 ev56" ;;
alphapca57) ax_gcc_arch="pca57 pca56 ev56" ;;
alphaev6) ax_gcc_arch=ev6 ;;
alphaev67) ax_gcc_arch=ev67 ;;
alphaev68) ax_gcc_arch="ev68 ev67" ;;
alphaev69) ax_gcc_arch="ev69 ev68 ev67" ;;
alphaev7) ax_gcc_arch="ev7 ev69 ev68 ev67" ;;
alphaev79) ax_gcc_arch="ev79 ev7 ev69 ev68 ev67" ;;
powerpc*)
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`
cputype=`echo $cputype | sed -e 's/ppc//g;s/ *//g'`
case $cputype in
*750*) ax_gcc_arch="750 G3" ;;
*740[[0-9]]*) ax_gcc_arch="$cputype 7400 G4" ;;
*74[[4-5]][[0-9]]*) ax_gcc_arch="$cputype 7450 G4" ;;
*74[[0-9]][[0-9]]*) ax_gcc_arch="$cputype G4" ;;
*970*) ax_gcc_arch="970 G5 power4";;
*POWER4*|*power4*|*gq*) ax_gcc_arch="power4 970";;
*POWER5*|*power5*|*gr*|*gs*) ax_gcc_arch="power5 power4 970";;
603ev|8240) ax_gcc_arch="$cputype 603e 603";;
*) ax_gcc_arch=$cputype ;;
esac
ax_gcc_arch="$ax_gcc_arch powerpc"
;;
esac
fi # not cross-compiling
fi # guess arch
if test "x$ax_gcc_arch" != x -a "x$ax_gcc_arch" != xno; then
for arch in $ax_gcc_arch; do
if test "x[]m4_default([$1],yes)" = xyes; then # if we require portable code
flags="-mtune=$arch"
# -mcpu=$arch and m$arch generate nonportable code on every arch except
# x86. And some other arches (e.g. Alpha) don't accept -mtune. Grrr.
case $host_cpu in i*86|x86_64*) flags="$flags -mcpu=$arch -m$arch";; esac
else
flags="-march=$arch -mcpu=$arch -m$arch"
fi
for flag in $flags; do
AX_CHECK_COMPILER_FLAGS($flag, [ax_cv_gcc_archflag=$flag; break])
done
test "x$ax_cv_gcc_archflag" = xunknown || break
done
fi
fi # $GCC=yes
])
AC_MSG_CHECKING([for gcc architecture flag])
AC_MSG_RESULT($ax_cv_gcc_archflag)
if test "x$ax_cv_gcc_archflag" = xunknown; then
m4_default([$3],:)
else
m4_default([$2], [CFLAGS="$CFLAGS $ax_cv_gcc_archflag"])
fi
])
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