dnl @synopsis AX_GCC_ARCHFLAG([PORTABLE?], [ACTION-SUCCESS], [ACTION-FAILURE]) dnl @summary find target architecture name for gcc -march/-mtune flags dnl @category Misc dnl dnl This macro tries to guess the "native" arch corresponding to dnl the target architecture for use with gcc's -march=arch or -mtune=arch dnl flags. If found, the cache variable $ax_cv_gcc_archflag is set to this dnl flag and ACTION-SUCCESS is executed; otherwise $ax_cv_gcc_archflag is dnl is set to "unknown" and ACTION-FAILURE is executed. The default dnl ACTION-SUCCESS is to add $ax_cv_gcc_archflag to the end of $CFLAGS. dnl dnl PORTABLE? should be either [yes] (default) or [no]. In the former case, dnl the flag is set to -mtune (or equivalent) so that the architecture dnl is only used for tuning, but the instruction set used is still dnl portable. In the latter case, the flag is set to -march (or equivalent) dnl so that architecture-specific instructions are enabled. dnl dnl The user can specify --with-gcc-arch= in order to override dnl the macro's choice of architecture, or --without-gcc-arch to dnl disable this. dnl dnl When cross-compiling, or if $CC is not gcc, then ACTION-FAILURE is dnl called unless the user specified --with-gcc-arch manually. dnl dnl Requires macros: AX_CHECK_COMPILER_FLAGS, AX_GCC_X86_CPUID dnl dnl (The main emphasis here is on recent CPUs, on the principle that dnl doing high-performance computing on old hardware is uncommon.) dnl dnl @version 2007-03-20 dnl @license GPLWithACException dnl @author Steven G. Johnson and Matteo Frigo. AC_DEFUN([AX_GCC_ARCHFLAG], [AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) AC_ARG_WITH(gcc-arch, [AC_HELP_STRING([--with-gcc-arch=], [use architecture for gcc -march/-mtune, instead of guessing])], ax_gcc_arch=$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*|amd64*) # use cpuid codes, in part from x86info-1.21 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[[78b]]?:*:*:*) ax_gcc_arch="pentium3 pentiumpro" ;; *6[[9d]]?:*:*:*) ax_gcc_arch="pentium-m pentium3 pentiumpro" ;; *6[[e]]?:*:*:*) ax_gcc_arch="native pentium-m pentium3 pentiumpro" ;; # Core Duo *6f?:*:*:*) ax_gcc_arch="core2 native pentium-m pentium3 pentiumpro" ;; *6??:*:*:*) ax_gcc_arch="native pentiumpro" ;; *f3[[347]]:*:*:*|*f4[[1347]]:*:*:*) case $host_cpu in x86_64*|amd64*) ax_gcc_arch="nocona pentium4 pentiumpro" ;; *) ax_gcc_arch="prescott pentium4 pentiumpro" ;; esac ;; *f??:*:*:*) ax_gcc_arch="native pentium4 pentiumpro";; esac ;; *:68747541:*:*) # AMD case $ax_cv_gcc_x86_cpuid_1 in *5[[67]]?:*:*:*) ax_gcc_arch=k6 ;; *5[[8c]]?:*:*:*) ax_gcc_arch="k6-2 k6" ;; *5[[9d]]?:*:*:*) 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="native 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 $host_cpu in i586*) ax_gcc_arch="native pentium" ;; i686*) ax_gcc_arch="native pentiumpro" ;; x86_64*|amd64*) ax_gcc_arch="native" ;; esac fi ;; sparc*) AC_PATH_PROG([PRTDIAG], [prtdiag], [prtdiag], [$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="$cputype 603e 603";; *Cell*) ax_gcc_arch="cellppu cell";; *) ax_gcc_arch="$cputype native" ;; 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 $host_cpu in i*86|x86_64*|amd64*) flags="$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 ])