compiler.h

   1 /*
   2  * Copyright 2005 Timo Hirvonen
   3  */
   4
   5 #ifndef COMPILER_H
   6 #define COMPILER_H
   7
   8 /*
   9  * GCC 2.96 or compatible required
  10  */
  11
  12 /* Optimization: Condition @x is likely */
  13 #define likely(x)       __builtin_expect(!!(x), 1)
  14
  15 /* Optimization: Condition @x is unlikely */
  16 #define unlikely(x)     __builtin_expect(!!(x), 0)
  17
  18 /* Optimization: Function never returns */
  19 #define __NORETURN      __attribute__((__noreturn__))
  20
  21 /* Argument at index @fmt_idx is printf compatible format string and
  22  * argument at index @first_idx is the first format argument */
  23 #define __FORMAT(fmt_idx, first_idx) __attribute__((format(printf, (fmt_idx), (first_idx))))
  24
  25 #if defined(__GNUC__) && (__GNUC__ >= 3)
  26
  27 /* Optimization: Pointer returned can't alias other pointers */
  28 #define __MALLOC        __attribute__((__malloc__))
  29
  30 #else
  31
  32 #define __MALLOC
  33
  34 #endif
  35
  36 #endif