PHP_HAVE_BUILTIN_CLZ 1168 Zend/zend_alloc.c #if (defined(__GNUC__) || __has_builtin(__builtin_clz))  && defined(PHP_HAVE_BUILTIN_CLZ)
PHP_HAVE_BUILTIN_CLZ  117 Zend/zend_hash.c #elif (defined(__GNUC__) || __has_builtin(__builtin_clz))  && defined(PHP_HAVE_BUILTIN_CLZ)