arch/x86/include/asm/rmwcc.h

   1 #ifndef _ASM_X86_RMWcc
   2 #define _ASM_X86_RMWcc
   3
   4 #if !defined(__GCC_ASM_FLAG_OUTPUTS__) && defined(CC_HAVE_ASM_GOTO)
   5
   6 /* Use asm goto */
   7
   8 #define __GEN_RMWcc(fullop, var, cc, ...)                               \
   9 do {                                                                    \
  10         asm_volatile_goto (fullop "; j" #cc " %l[cc_label]"             \
  11                         : : "m" (var), ## __VA_ARGS__                   \
  12                         : "memory" : cc_label);                         \
  13         return 0;                                                       \
  14 cc_label:                                                               \
  15         return 1;                                                       \
  16 } while (0)
  17
  18 #define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
  19         __GEN_RMWcc(op " " arg0, var, cc)
  20
  21 #define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                  \
  22         __GEN_RMWcc(op " %1, " arg0, var, cc, vcon (val))
  23
  24 #else /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CC_HAVE_ASM_GOTO) */
  25
  26 /* Use flags output or a set instruction */
  27
  28 #define __GEN_RMWcc(fullop, var, cc, ...)                               \
  29 do {                                                                    \
  30         bool c;                                                         \
  31         asm volatile (fullop ";" CC_SET(cc)                             \
  32                         : "+m" (var), CC_OUT(cc) (c)                    \
  33                         : __VA_ARGS__ : "memory");                      \
  34         return c;                                                       \
  35 } while (0)
  36
  37 #define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
  38         __GEN_RMWcc(op " " arg0, var, cc)
  39
  40 #define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                  \
  41         __GEN_RMWcc(op " %2, " arg0, var, cc, vcon (val))
  42
  43 #endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CC_HAVE_ASM_GOTO) */
  44
  45 #endif /* _ASM_X86_RMWcc */