From: Eric Biggers <ebiggers3@gmail.com>
Date: Fri, 17 May 2013 21:48:46 +0000 (-0500)
Subject: compiler.h: Add likely(), unlikely()
X-Git-Tag: v1.4.0~17
X-Git-Url: https://wimlib.net/git/?p=wimlib;a=commitdiff_plain;h=768d53aa2bde3b39dfa85fe0dd940d67ae97d5ef

compiler.h: Add likely(), unlikely()
---

diff --git a/include/wimlib/compiler.h b/include/wimlib/compiler.h
index 19a9ebe7..78a7bef5 100644
--- a/include/wimlib/compiler.h
+++ b/include/wimlib/compiler.h
@@ -19,6 +19,8 @@
 #	define _malloc_attribute __attribute__((malloc))
 #	define _warn_unused_result_attribute __attribute__((warn_unused_result))
 #	define _aligned_attribute(size) __attribute__((aligned(size)))
+#	define likely(x) __builtin_expect(!!(x), 1)
+#	define unlikely(x) __builtin_expect(!!(x), 0)
 #else
 #	define WIMLIBAPI
 #	define _always_inline_attribute inline
@@ -28,6 +30,8 @@
 #	define _malloc_attribute
 #	define _warn_unused_result_attribute
 #	define _aligned_attribute(size)
+#	define likely(x) (x)
+#	define unlikely(x) (x)
 #endif /* __GNUC__ */
 
 #endif /* _WIMLIB_COMPILER_H */