| Austin Schuh | 906616c | 2019-01-21 20:25:11 -0800 | [diff] [blame^] | 1 | AC_DEFUN([AX_C___BUILTIN_EXPECT], [ |
| 2 | AC_MSG_CHECKING(for __builtin_expect) |
| 3 | AC_CACHE_VAL(ac_cv___builtin_expect, [ |
| 4 | AC_TRY_COMPILE( |
| 5 | [int foo(void) { if (__builtin_expect(0, 0)) return 1; return 0; }], |
| 6 | [], |
| 7 | ac_cv___builtin_expect=yes, |
| 8 | ac_cv___builtin_expect=no |
| 9 | )]) |
| 10 | if test "$ac_cv___builtin_expect" = "yes"; then |
| 11 | AC_DEFINE(HAVE___BUILTIN_EXPECT, 1, [define if your compiler has __builtin_expect]) |
| 12 | fi |
| 13 | AC_MSG_RESULT($ac_cv___builtin_expect) |
| 14 | ]) |