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1 # ===========================================================================
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2 # http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html
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3 # ===========================================================================
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4 #
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5 # SYNOPSIS
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6 #
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7 # AX_GCC_X86_CPUID(OP)
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8 #
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9 # DESCRIPTION
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10 #
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11 # On Pentium and later x86 processors, with gcc or a compiler that has a
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12 # compatible syntax for inline assembly instructions, run a small program
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13 # that executes the cpuid instruction with input OP. This can be used to
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14 # detect the CPU type.
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15 #
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16 # On output, the values of the eax, ebx, ecx, and edx registers are stored
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17 # as hexadecimal strings as "eax:ebx:ecx:edx" in the cache variable
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18 # ax_cv_gcc_x86_cpuid_OP.
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19 #
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20 # If the cpuid instruction fails (because you are running a
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21 # cross-compiler, or because you are not using gcc, or because you are on
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22 # a processor that doesn't have this instruction), ax_cv_gcc_x86_cpuid_OP
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23 # is set to the string "unknown".
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24 #
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25 # This macro mainly exists to be used in AX_GCC_ARCHFLAG.
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26 #
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27 # LICENSE
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28 #
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29 # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
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30 # Copyright (c) 2008 Matteo Frigo
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31 #
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32 # This program is free software: you can redistribute it and/or modify it
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33 # under the terms of the GNU General Public License as published by the
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34 # Free Software Foundation, either version 3 of the License, or (at your
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35 # option) any later version.
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36 #
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37 # This program is distributed in the hope that it will be useful, but
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38 # WITHOUT ANY WARRANTY; without even the implied warranty of
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39 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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40 # Public License for more details.
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41 #
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42 # You should have received a copy of the GNU General Public License along
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43 # with this program. If not, see <http://www.gnu.org/licenses/>.
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44 #
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45 # As a special exception, the respective Autoconf Macro's copyright owner
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46 # gives unlimited permission to copy, distribute and modify the configure
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47 # scripts that are the output of Autoconf when processing the Macro. You
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48 # need not follow the terms of the GNU General Public License when using
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49 # or distributing such scripts, even though portions of the text of the
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50 # Macro appear in them. The GNU General Public License (GPL) does govern
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51 # all other use of the material that constitutes the Autoconf Macro.
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52 #
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53 # This special exception to the GPL applies to versions of the Autoconf
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54 # Macro released by the Autoconf Archive. When you make and distribute a
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55 # modified version of the Autoconf Macro, you may extend this special
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56 # exception to the GPL to apply to your modified version as well.
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57
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58 #serial 7
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59
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60 AC_DEFUN([AX_GCC_X86_CPUID],
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61 [AC_REQUIRE([AC_PROG_CC])
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62 AC_LANG_PUSH([C])
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63 AC_CACHE_CHECK(for x86 cpuid $1 output, ax_cv_gcc_x86_cpuid_$1,
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64 [AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [
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65 int op = $1, eax, ebx, ecx, edx;
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66 FILE *f;
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67 __asm__("cpuid"
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68 : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
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69 : "a" (op));
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70 f = fopen("conftest_cpuid", "w"); if (!f) return 1;
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71 fprintf(f, "%x:%x:%x:%x\n", eax, ebx, ecx, edx);
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72 fclose(f);
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73 return 0;
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74 ])],
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75 [ax_cv_gcc_x86_cpuid_$1=`cat conftest_cpuid`; rm -f conftest_cpuid],
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76 [ax_cv_gcc_x86_cpuid_$1=unknown; rm -f conftest_cpuid],
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77 [ax_cv_gcc_x86_cpuid_$1=unknown])])
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78 AC_LANG_POP([C])
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79 ])
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