Home My Page Projects Code Snippets Project Openings diderot
Summary Activity Tracker Tasks SCM

SCM Repository

[diderot] Annotation of /branches/cuda/config/ax_gcc_x86_cpuid.m4
ViewVC logotype

Annotation of /branches/cuda/config/ax_gcc_x86_cpuid.m4

Parent Directory Parent Directory | Revision Log Revision Log


Revision 5597 - (view) (download)

1 : jhr 5597 # ===========================================================================
2 :     # http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html
3 :     # ===========================================================================
4 :     #
5 :     # SYNOPSIS
6 :     #
7 :     # AX_GCC_X86_CPUID(OP)
8 :     # AX_GCC_X86_CPUID_COUNT(OP, COUNT)
9 :     #
10 :     # DESCRIPTION
11 :     #
12 :     # On Pentium and later x86 processors, with gcc or a compiler that has a
13 :     # compatible syntax for inline assembly instructions, run a small program
14 :     # that executes the cpuid instruction with input OP. This can be used to
15 :     # detect the CPU type. AX_GCC_X86_CPUID_COUNT takes an additional COUNT
16 :     # parameter that gets passed into register ECX before calling cpuid.
17 :     #
18 :     # On output, the values of the eax, ebx, ecx, and edx registers are stored
19 :     # as hexadecimal strings as "eax:ebx:ecx:edx" in the cache variable
20 :     # ax_cv_gcc_x86_cpuid_OP.
21 :     #
22 :     # If the cpuid instruction fails (because you are running a
23 :     # cross-compiler, or because you are not using gcc, or because you are on
24 :     # a processor that doesn't have this instruction), ax_cv_gcc_x86_cpuid_OP
25 :     # is set to the string "unknown".
26 :     #
27 :     # This macro mainly exists to be used in AX_GCC_ARCHFLAG.
28 :     #
29 :     # LICENSE
30 :     #
31 :     # Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
32 :     # Copyright (c) 2008 Matteo Frigo
33 :     # Copyright (c) 2015 Michael Petch <mpetch@capp-sysware.com>
34 :     #
35 :     # This program is free software: you can redistribute it and/or modify it
36 :     # under the terms of the GNU General Public License as published by the
37 :     # Free Software Foundation, either version 3 of the License, or (at your
38 :     # option) any later version.
39 :     #
40 :     # This program is distributed in the hope that it will be useful, but
41 :     # WITHOUT ANY WARRANTY; without even the implied warranty of
42 :     # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
43 :     # Public License for more details.
44 :     #
45 :     # You should have received a copy of the GNU General Public License along
46 :     # with this program. If not, see <http://www.gnu.org/licenses/>.
47 :     #
48 :     # As a special exception, the respective Autoconf Macro's copyright owner
49 :     # gives unlimited permission to copy, distribute and modify the configure
50 :     # scripts that are the output of Autoconf when processing the Macro. You
51 :     # need not follow the terms of the GNU General Public License when using
52 :     # or distributing such scripts, even though portions of the text of the
53 :     # Macro appear in them. The GNU General Public License (GPL) does govern
54 :     # all other use of the material that constitutes the Autoconf Macro.
55 :     #
56 :     # This special exception to the GPL applies to versions of the Autoconf
57 :     # Macro released by the Autoconf Archive. When you make and distribute a
58 :     # modified version of the Autoconf Macro, you may extend this special
59 :     # exception to the GPL to apply to your modified version as well.
60 :    
61 :     #serial 9
62 :    
63 :     AC_DEFUN([AX_GCC_X86_CPUID],
64 :     [AX_GCC_X86_CPUID_COUNT($1, 0)
65 :     ])
66 :    
67 :     AC_DEFUN([AX_GCC_X86_CPUID_COUNT],
68 :     [AC_REQUIRE([AC_PROG_CC])
69 :     AC_LANG_PUSH([C])
70 :     AC_CACHE_CHECK(for x86 cpuid $1 output, ax_cv_gcc_x86_cpuid_$1,
71 :     [AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [
72 :     int op = $1, level = $2, eax, ebx, ecx, edx;
73 :     FILE *f;
74 :     __asm__ __volatile__ ("xchg %%ebx, %1\n"
75 :     "cpuid\n"
76 :     "xchg %%ebx, %1\n"
77 :     : "=a" (eax), "=r" (ebx), "=c" (ecx), "=d" (edx)
78 :     : "a" (op), "2" (level));
79 :    
80 :     f = fopen("conftest_cpuid", "w"); if (!f) return 1;
81 :     fprintf(f, "%x:%x:%x:%x\n", eax, ebx, ecx, edx);
82 :     fclose(f);
83 :     return 0;
84 :     ])],
85 :     [ax_cv_gcc_x86_cpuid_$1=`cat conftest_cpuid`; rm -f conftest_cpuid],
86 :     [ax_cv_gcc_x86_cpuid_$1=unknown; rm -f conftest_cpuid],
87 :     [ax_cv_gcc_x86_cpuid_$1=unknown])])
88 :     AC_LANG_POP([C])
89 :     ])

root@smlnj-gforge.cs.uchicago.edu
ViewVC Help
Powered by ViewVC 1.0.0