1 #define a_cas a_cas 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 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 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 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 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 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 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 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 69 static inline void a_barrier() 70 { 71 __asm__ __volatile__( "" : : : "memory" ); 72 } 73 74 #define a_spin a_spin 75 static inline void a_spin() 76 { 77 __asm__ __volatile__( "pause" : : : "memory" ); 78 } 79 80 #define 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 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 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_32 104 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