linux-old/include/linux/compiler.h
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   1#ifndef __LINUX_COMPILER_H
   2#define __LINUX_COMPILER_H
   3
   4/* Somewhere in the middle of the GCC 2.96 development cycle, we implemented
   5   a mechanism by which the user can annotate likely branch directions and
   6   expect the blocks to be reordered appropriately.  Define __builtin_expect
   7   to nothing for earlier compilers.  */
   8
   9#if __GNUC__ == 2 && __GNUC_MINOR__ < 96
  10#define __builtin_expect(x, expected_value) (x)
  11#endif
  12
  13#define likely(x)       __builtin_expect((x),1)
  14#define unlikely(x)     __builtin_expect((x),0)
  15
  16#if __GNUC__ > 3
  17#define __attribute_used__      __attribute((__used__))
  18#elif __GNUC__ == 3
  19#if  __GNUC_MINOR__ >= 3
  20# define __attribute_used__     __attribute__((__used__))
  21#else
  22# define __attribute_used__     __attribute__((__unused__))
  23#endif /* __GNUC_MINOR__ >= 3 */
  24#elif __GNUC__ == 2
  25#define __attribute_used__      __attribute__((__unused__))
  26#else
  27#define __attribute_used__      /* not implemented */
  28#endif /* __GNUC__ */
  29
  30#endif /* __LINUX_COMPILER_H */
  31
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