arch/x86/include/asm/rmwcc.h

   1 #ifndef _ASM_X86_RMWcc
   2 #define _ASM_X86_RMWcc
   3
   4 #ifdef CC_HAVE_ASM_GOTO
   5
   6 #define __GEN_RMWcc(fullop, var, cc, ...)                               \
   7 do {                                                                    \
   8         asm_volatile_goto (fullop "; j" cc " %l[cc_label]"              \
   9                         : : "m" (var), ## __VA_ARGS__                   \
  10                         : "memory" : cc_label);                         \
  11         return 0;                                                       \
  12 cc_label:                                                               \
  13         return 1;                                                       \
  14 } while (0)
  15
  16 #define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
  17         __GEN_RMWcc(op " " arg0, var, cc)
  18
  19 #define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                  \
  20         __GEN_RMWcc(op " %1, " arg0, var, cc, vcon (val))
  21
  22 #else /* !CC_HAVE_ASM_GOTO */
  23
  24 #define __GEN_RMWcc(fullop, var, cc, ...)                               \
  25 do {                                                                    \
  26         char c;                                                         \
  27         asm volatile (fullop "; set" cc " %1"                           \
  28                         : "+m" (var), "=qm" (c)                         \
  29                         : __VA_ARGS__ : "memory");                      \
  30         return c != 0;                                                  \
  31 } while (0)
  32
  33 #define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
  34         __GEN_RMWcc(op " " arg0, var, cc)
  35
  36 #define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                  \
  37         __GEN_RMWcc(op " %2, " arg0, var, cc, vcon (val))
  38
  39 #endif /* CC_HAVE_ASM_GOTO */
  40
  41 #endif /* _ASM_X86_RMWcc */