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[buddy] Hint gcc about likely/unlikely branches.

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* src/bdd.h (__likely, __unlikely): Introduce these two macros.
* src/bddop.c, src/kerner.c: Use them in many situations.
This commit is contained in:
Alexandre Duret-Lutz 2011-04-30 13:30:05 +02:00
parent 24054605da
commit 2b58fb90c4
4 changed files with 182 additions and 98 deletions
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4
buddy/src/bdd.h
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@ -42,10 +42,14 @@
#define __purefn __attribute__((__pure__))
#define __constfn __attribute__((__const__))
#define __noreturnfn __attribute__((__noreturn__))
#define __likely(expr) __builtin_expect(!!(expr), 1)
#define __unlikely(expr) __builtin_expect(!!(expr), 0)
#else
#define __purefn
#define __constfn
#define __noreturnfn
#define __likely(expr) (expr)
#define __unlikely(expr) (expr)
#endif
/* Allow this headerfile to define C++ constructs if requested */