LXR linux/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, ...)                               \
   9do {                                                                    \
  10        asm_volatile_goto (fullop "; j" #cc " %l[cc_label]"             \
  11                        : : "m" (var), ## __VA_ARGS__                   \
  12                        : "memory" : cc_label);                         \
  13        return 0;                                                       \
  14cc_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, ...)                               \
  29do {                                                                    \
  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 */
  46