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static inline int
atomic·cas(volatile int *p, int t, int s)
{
__asm__ __volatile__ (
"lock ; cmpxchg %3, %1"
: "=a"(t), "=m"(*p) : "a"(t), "r"(s) : "memory" );
return t;
}
static inline int
atomic·swap(volatile int *p, int v)
{
__asm__ __volatile__(
"xchg %0, %1"
: "=r"(v), "=m"(*p) : "0"(v) : "memory" );
return v;
}
static inline int
atomic·fetchadd(volatile int *p, int v)
{
__asm__ __volatile__(
"lock ; xadd %0, %1"
: "=r"(v), "=m"(*p) : "0"(v) : "memory" );
return v;
}
static inline void
atomic·and(volatile int *p, int v)
{
__asm__ __volatile__(
"lock ; and %1, %0"
: "=m"(*p) : "r"(v) : "memory" );
}
static inline void
atomic·or(volatile int *p, int v)
{
__asm__ __volatile__(
"lock ; or %1, %0"
: "=m"(*p) : "r"(v) : "memory" );
}
static inline void
atomic·inc(volatile int *p)
{
__asm__ __volatile__(
"lock ; incl %0"
: "=m"(*p) : "m"(*p) : "memory" );
}
static inline void
atomic·dec(volatile int *p)
{
__asm__ __volatile__(
"lock ; decl %0"
: "=m"(*p) : "m"(*p) : "memory" );
}
static inline void
atomic·store(volatile int *p, int x)
{
__asm__ __volatile__(
"mov %1, %0 ; lock ; orl $0,(%%esp)"
: "=m"(*p) : "r"(x) : "memory" );
}
static inline void
atomic·barrier()
{
__asm__ __volatile__( "" : : : "memory" );
}
static inline void
atomic·spin()
{
__asm__ __volatile__( "pause" : : : "memory" );
}
static inline void
atomic·crash()
{
__asm__ __volatile__( "hlt" : : : "memory" );
}
static inline int
atomic·ctz64(uint64 x)
{
int r;
__asm__( "bsf %1,%0 ; jnz 1f ; bsf %2,%0 ; add $32,%0\n1:"
: "=&r"(r) : "r"((unsigned)x), "r"((unsigned)(x>>32)) );
return r;
}
static inline int
atomic·ctz32(uint32 x)
{
int r;
__asm__( "bsf %1,%0" : "=r"(r) : "r"(x) );
return r;
}
static inline int
atomic·clz32(uint32 x)
{
__asm__( "bsr %1,%0 ; xor $31,%0" : "=r"(x) : "r"(x) );
return x;
}
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