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])
216