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[MINOR] added the Linux-style likely/unlikely macros

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Recent GCC versions support the __builtin_expect() macro which
is undecipherable. Let's use likely()/unlikely() like it's done
in Linux.
This commit is contained in:
Willy Tarreau 2007-01-13 23:06:06 +01:00
parent 0f7562b8d3
commit 7d58a63071
1 changed files with 13 additions and 0 deletions
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13
include/common/standard.h
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@ -36,6 +36,19 @@
* power of 2, and 0 otherwise */ * power of 2, and 0 otherwise */
#define POWEROF2(x) (((x) & ((x)-1)) == 0) #define POWEROF2(x) (((x) & ((x)-1)) == 0)
/*
* Gcc >= 3 provides the ability for the programme to give hints to the
* compiler about what branch of an if is most likely to be taken. This
* helps the compiler produce the most compact critical paths, which is
* generally better for the cache and to reduce the number of jumps.
*/
#if __GNUC__ < 3
#define __builtin_expect(x,y) (x)
#endif
#define likely(x) (__builtin_expect((x) != 0, 1))
#define unlikely(x) (__builtin_expect((x) != 0, 0))
/* /*
* copies at most <size-1> chars from <src> to <dst>. Last char is always * copies at most <size-1> chars from <src> to <dst>. Last char is always