Branch and cache miss speedups

[fio.git] / compiler / compiler.h

diff --git a/compiler/compiler.h b/compiler/compiler.h
index 1a0556bd3a0808c1c54bec23b85fd5e10cd22abc..0a0213b60fca5204cb9d0294ffb01139baa23083 100644 (file)
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -13,6 +13,13 @@
 #define __must_check
 #endif
 
-#define uninitialized_var(x) x = x
+/*
+ * Mark unused variables passed to ops functions as unused, to silence gcc
+ */
+#define fio_unused     __attribute__((__unused__))
+#define fio_init       __attribute__((constructor))
+#define fio_exit       __attribute__((destructor))
+
+#define fio_unlikely(x)        __builtin_expect(!!(x), 0)
 
 #endif