31 #include <sys/ccompile.h>
32 #include <sys/types.h>
33
34 #ifdef __cplusplus
35 extern "C" {
36 #endif
37
38 #if !defined(__lint) && defined(__GNUC__)
39
40 #if defined(__amd64)
41 #define __SUF "q"
42 #elif defined(__i386)
43 #define __SUF "l"
44 #else
45 #error "port me"
46 #endif
47
48 extern __GNU_INLINE int
49 highbit(ulong_t i)
50 {
51 long value = -1l;
52
53 __asm__(
54 "bsr" __SUF " %1,%0"
55 : "+r" (value)
56 : "r" (i)
57 : "cc");
58
59 return ((int)(value + 1));
60 }
61
62 extern __GNU_INLINE int
63 lowbit(ulong_t i)
64 {
65 long value = -1l;
66
67 __asm__(
68 "bsf" __SUF " %1,%0"
69 : "+r" (value)
70 : "r" (i)
71 : "cc");
72
73 return ((int)(value + 1));
74 }
75
76 extern __GNU_INLINE uint_t
77 atomic_btr32(uint32_t *memory, uint_t bitnum)
78 {
79 uint8_t value;
80
81 __asm__ __volatile__(
82 "lock;"
83 "btrl %2,%0;"
84 "setc %1"
85 : "+m" (*memory), "=r" (value)
86 : "ir" (bitnum)
87 : "cc");
88
89 return ((uint_t)value);
90 }
91
92 #undef __SUF
93
|
31 #include <sys/ccompile.h>
32 #include <sys/types.h>
33
34 #ifdef __cplusplus
35 extern "C" {
36 #endif
37
38 #if !defined(__lint) && defined(__GNUC__)
39
40 #if defined(__amd64)
41 #define __SUF "q"
42 #elif defined(__i386)
43 #define __SUF "l"
44 #else
45 #error "port me"
46 #endif
47
48 extern __GNU_INLINE int
49 highbit(ulong_t i)
50 {
51 long value;
52 uint8_t zf;
53
54 __asm__(
55 "bsr" __SUF " %2,%0;"
56 "setz %1"
57 : "=r" (value), "=q" (zf)
58 : "mr" (i)
59 : "cc");
60
61 return (zf ? 0 : (value + 1));
62 }
63
64 extern __GNU_INLINE int
65 lowbit(ulong_t i)
66 {
67 long value;
68 uint8_t zf;
69
70 __asm__(
71 "bsf" __SUF " %2,%0;"
72 "setz %1"
73 : "=r" (value), "=q" (zf)
74 : "mr" (i)
75 : "cc");
76
77 return (zf ? 0 : (value + 1));
78 }
79
80 extern __GNU_INLINE uint_t
81 atomic_btr32(uint32_t *memory, uint_t bitnum)
82 {
83 uint8_t value;
84
85 __asm__ __volatile__(
86 "lock;"
87 "btrl %2,%0;"
88 "setc %1"
89 : "+m" (*memory), "=r" (value)
90 : "ir" (bitnum)
91 : "cc");
92
93 return ((uint_t)value);
94 }
95
96 #undef __SUF
97
|