> clang supports __builtin_expect, even on Windows.
Another use of __builtin_expect is here:
2020-08-16 Bruno Haible <br...@clisp.org>
avltreehash-list, rbtreehash-list: Optimize also on clang.
* lib/gl_anytreehash_list1.h (add_nodes_to_buckets): Use
__builtin_expect also on clang.
diff --git a/lib/gl_anytreehash_list1.h b/lib/gl_anytreehash_list1.h
index aba45d6..88fac00 100644
--- a/lib/gl_anytreehash_list1.h
+++ b/lib/gl_anytreehash_list1.h
@@ -340,7 +340,7 @@ add_nodes_to_buckets (gl_list_t list)
return -1;
}
/* Tell GCC that the likely return value is 0. */
-#if __GNUC__ >= 3
+#if (__GNUC__ >= 3) || (__clang_major__ >= 4)
# define add_nodes_to_buckets(list) \
__builtin_expect ((add_nodes_to_buckets) (list), 0)
#endif
