1 #define a_cas a_cas
a_cas(volatile int * p,int t,int s)2 static inline int a_cas(volatile int *p, int t, int s)
3 {
4 __asm__ __volatile__ (
5 "lock ; cmpxchg %3, %1"
6 : "=a"(t), "=m"(*p) : "a"(t), "r"(s) : "memory" );
7 return t;
8 }
9
10 #define a_swap a_swap
a_swap(volatile int * p,int v)11 static inline int a_swap(volatile int *p, int v)
12 {
13 __asm__ __volatile__(
14 "xchg %0, %1"
15 : "=r"(v), "=m"(*p) : "0"(v) : "memory" );
16 return v;
17 }
18
19 #define a_fetch_add a_fetch_add
a_fetch_add(volatile int * p,int v)20 static inline int a_fetch_add(volatile int *p, int v)
21 {
22 __asm__ __volatile__(
23 "lock ; xadd %0, %1"
24 : "=r"(v), "=m"(*p) : "0"(v) : "memory" );
25 return v;
26 }
27
28 #define a_and a_and
a_and(volatile int * p,int v)29 static inline void a_and(volatile int *p, int v)
30 {
31 __asm__ __volatile__(
32 "lock ; and %1, %0"
33 : "=m"(*p) : "r"(v) : "memory" );
34 }
35
36 #define a_or a_or
a_or(volatile int * p,int v)37 static inline void a_or(volatile int *p, int v)
38 {
39 __asm__ __volatile__(
40 "lock ; or %1, %0"
41 : "=m"(*p) : "r"(v) : "memory" );
42 }
43
44 #define a_inc a_inc
a_inc(volatile int * p)45 static inline void a_inc(volatile int *p)
46 {
47 __asm__ __volatile__(
48 "lock ; incl %0"
49 : "=m"(*p) : "m"(*p) : "memory" );
50 }
51
52 #define a_dec a_dec
a_dec(volatile int * p)53 static inline void a_dec(volatile int *p)
54 {
55 __asm__ __volatile__(
56 "lock ; decl %0"
57 : "=m"(*p) : "m"(*p) : "memory" );
58 }
59
60 #define a_store a_store
a_store(volatile int * p,int x)61 static inline void a_store(volatile int *p, int x)
62 {
63 __asm__ __volatile__(
64 "mov %1, %0 ; lock ; orl $0,(%%esp)"
65 : "=m"(*p) : "r"(x) : "memory" );
66 }
67
68 #define a_barrier a_barrier
a_barrier()69 static inline void a_barrier()
70 {
71 __asm__ __volatile__( "" : : : "memory" );
72 }
73
74 #define a_spin a_spin
a_spin()75 static inline void a_spin()
76 {
77 __asm__ __volatile__( "pause" : : : "memory" );
78 }
79
80 #define a_crash a_crash
a_crash()81 static inline void a_crash()
82 {
83 __asm__ __volatile__( "hlt" : : : "memory" );
84 }
85
86 #define a_ctz_64 a_ctz_64
a_ctz_64(uint64_t x)87 static inline int a_ctz_64(uint64_t x)
88 {
89 int r;
90 __asm__( "bsf %1,%0 ; jnz 1f ; bsf %2,%0 ; add $32,%0\n1:"
91 : "=&r"(r) : "r"((unsigned)x), "r"((unsigned)(x>>32)) );
92 return r;
93 }
94
95 #define a_ctz_32 a_ctz_32
a_ctz_32(uint32_t x)96 static inline int a_ctz_32(uint32_t x)
97 {
98 int r;
99 __asm__( "bsf %1,%0" : "=r"(r) : "r"(x) );
100 return r;
101 }
102
103 #define a_clz_32 a_clz_32
a_clz_32(uint32_t x)104 static inline int a_clz_32(uint32_t x)
105 {
106 __asm__( "bsr %1,%0 ; xor $31,%0" : "=r"(x) : "r"(x) );
107 return x;
108 }
109