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-rw-r--r--unix/configure.in12
1 files changed, 8 insertions, 4 deletions
diff --git a/unix/configure.in b/unix/configure.in
index c04c735..869fbaa 100644
--- a/unix/configure.in
+++ b/unix/configure.in
@@ -571,12 +571,16 @@ AC_MSG_RESULT([$tcl_ok])
AC_CACHE_CHECK([whether the cpuid instruction is usable], tcl_cv_cpuid, [
AC_TRY_LINK(, [
- int index,ax,bx,cx,dx;
- __asm__ __volatile__ ("cpuid":\
- "=a" (ax), "=b" (bx), "=c" (cx), "=d" (dx) : "a" (index));
+ int index,regsPtr[4];
+ __asm__ __volatile__("mov %%ebx, %%edi \n\t"
+ "cpuid \n\t"
+ "mov %%ebx, %%esi \n\t"
+ "mov %%edi, %%ebx \n\t"
+ : "=a"(regsPtr[0]), "=S"(regsPtr[1]), "=c"(regsPtr[2]), "=d"(regsPtr[3])
+ : "a"(index));
], tcl_cv_cpuid=yes, tcl_cv_cpuid=no)])
if test $tcl_cv_cpuid = yes; then
- AC_DEFINE(HAVE_CPUID)
+ AC_DEFINE(HAVE_CPUID, 1, [Is the cpuid instruction usable?])
fi
#--------------------------------------------------------------------