14 lines
483 B
Text
14 lines
483 B
Text
AC_DEFUN([AX_C___BUILTIN_EXPECT], [
|
|
AC_MSG_CHECKING(for __builtin_expect)
|
|
AC_CACHE_VAL(ac_cv___builtin_expect, [
|
|
AC_TRY_COMPILE(
|
|
[int foo(void) { if (__builtin_expect(0, 0)) return 1; return 0; }],
|
|
[],
|
|
ac_cv___builtin_expect=yes,
|
|
ac_cv___builtin_expect=no
|
|
)])
|
|
if test "$ac_cv___builtin_expect" = "yes"; then
|
|
AC_DEFINE(HAVE___BUILTIN_EXPECT, 1, [define if your compiler has __builtin_expect])
|
|
fi
|
|
AC_MSG_RESULT($ac_cv___builtin_expect)
|
|
])
|