root/arch/x86/include/asm/rmwcc.h

INCLUDED FROM

#ifndef _ASM_X86_RMWcc
#define _ASM_X86_RMWcc

#ifdef CC_HAVE_ASM_GOTO

#define __GEN_RMWcc(fullop, var, cc, ...)                               \
do {                                                                    \
        asm_volatile_goto (fullop "; j" cc " %l[cc_label]"              \
                        : : "m" (var), ## __VA_ARGS__                   \
                        : "memory" : cc_label);                         \
        return 0;                                                       \
cc_label:                                                               \
        return 1;                                                       \
} while (0)

#define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
        __GEN_RMWcc(op " " arg0, var, cc)

#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                  \
        __GEN_RMWcc(op " %1, " arg0, var, cc, vcon (val))

#else /* !CC_HAVE_ASM_GOTO */

#define __GEN_RMWcc(fullop, var, cc, ...)                               \
do {                                                                    \
        char c;                                                         \
        asm volatile (fullop "; set" cc " %1"                           \
                        : "+m" (var), "=qm" (c)                         \
                        : __VA_ARGS__ : "memory");                      \
        return c != 0;                                                  \
} while (0)

#define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
        __GEN_RMWcc(op " " arg0, var, cc)

#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                  \
        __GEN_RMWcc(op " %2, " arg0, var, cc, vcon (val))

#endif /* CC_HAVE_ASM_GOTO */

#endif /* _ASM_X86_RMWcc */