# ===========================================================================

#      http://www.gnu.org/software/autoconf-archive/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.)

#

# LICENSE

#

#   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 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.

#serial 8

AC_DEFUN([AX_GCC_ARCHFLAG],

[AC_REQUIRE([AC_PROG_CC])

AC_REQUIRE([AC_CANONICAL_HOST])

AC_ARG_WITH(gcc-arch, [AS_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

])