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-rw-r--r--src/basic/macro.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/basic/macro.h b/src/basic/macro.h
index e41aa4260f..6b2aeb933f 100644
--- a/src/basic/macro.h
+++ b/src/basic/macro.h
@@ -89,6 +89,15 @@
#define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
#define UNIQ __COUNTER__
+/* builtins */
+#if __SIZEOF_INT__ == 4
+#define BUILTIN_FFS_U32(x) __builtin_ffs(x);
+#elif __SIZEOF_LONG__ == 4
+#define BUILTIN_FFS_U32(x) __builtin_ffsl(x);
+#else
+#error "neither int nor long are four bytes long?!?"
+#endif
+
/* Rounds up */
#define ALIGN4(l) (((l) + 3) & ~3)