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Just check cpuid itself, don't clobber %ebx

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This commit is contained in:
Frank Denis 2013-04-27 14:07:39 -07:00
parent 46f5ec89a6
commit bb70f436d0
1 changed files with 4 additions and 7 deletions
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11
configure.ac
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@ -241,13 +241,10 @@ AC_SUBST(HAVE_TI_MODE_V)
AC_MSG_CHECKING(for cpuid instruction)
HAVE_CPUID_V=0
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
]], [[
unsigned int level = 0;
unsigned int *eax = NULL, *ebx = NULL, *ecx = NULL, *edx = NULL;
__asm__("cpuid" : "=a"(*eax), "=b" (*ebx), "=c"(*ecx), "=d"(*edx)
: "0"(level));
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[
__asm__("movl %ebx,%esi\n"
"cpuid\n"
"movl %esi,%ebx");
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([HAVE_CPUID], [1], [cpuid instruction is available])