1 #ifndef _LINUX_MATH64_H
2 #define _LINUX_MATH64_H
4 #include <linux/types.h>
7 #if BITS_PER_LONG == 64
9 #define div64_long(x, y) div64_s64((x), (y))
10 #define div64_ul(x, y) div64_u64((x), (y))
13 * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
15 * This is commonly provided by 32bit archs to provide an optimized 64bit
18 static inline u64
div_u64_rem(u64 dividend
, u32 divisor
, u32
*remainder
)
20 *remainder
= dividend
% divisor
;
21 return dividend
/ divisor
;
25 * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
27 static inline s64
div_s64_rem(s64 dividend
, s32 divisor
, s32
*remainder
)
29 *remainder
= dividend
% divisor
;
30 return dividend
/ divisor
;
34 * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
36 static inline u64
div64_u64_rem(u64 dividend
, u64 divisor
, u64
*remainder
)
38 *remainder
= dividend
% divisor
;
39 return dividend
/ divisor
;
43 * div64_u64 - unsigned 64bit divide with 64bit divisor
45 static inline u64
div64_u64(u64 dividend
, u64 divisor
)
47 return dividend
/ divisor
;
51 * div64_s64 - signed 64bit divide with 64bit divisor
53 static inline s64
div64_s64(s64 dividend
, s64 divisor
)
55 return dividend
/ divisor
;
58 #elif BITS_PER_LONG == 32
60 #define div64_long(x, y) div_s64((x), (y))
61 #define div64_ul(x, y) div_u64((x), (y))
64 static inline u64
div_u64_rem(u64 dividend
, u32 divisor
, u32
*remainder
)
66 *remainder
= do_div(dividend
, divisor
);
72 extern s64
div_s64_rem(s64 dividend
, s32 divisor
, s32
*remainder
);
76 extern u64
div64_u64_rem(u64 dividend
, u64 divisor
, u64
*remainder
);
80 extern u64
div64_u64(u64 dividend
, u64 divisor
);
84 extern s64
div64_s64(s64 dividend
, s64 divisor
);
87 #endif /* BITS_PER_LONG */
90 * div_u64 - unsigned 64bit divide with 32bit divisor
92 * This is the most common 64bit divide and should be used if possible,
93 * as many 32bit archs can optimize this variant better than a full 64bit
97 static inline u64
div_u64(u64 dividend
, u32 divisor
)
100 return div_u64_rem(dividend
, divisor
, &remainder
);
105 * div_s64 - signed 64bit divide with 32bit divisor
108 static inline s64
div_s64(s64 dividend
, s32 divisor
)
111 return div_s64_rem(dividend
, divisor
, &remainder
);
115 u32
iter_div_u64_rem(u64 dividend
, u32 divisor
, u64
*remainder
);
117 static __always_inline u32
118 __iter_div_u64_rem(u64 dividend
, u32 divisor
, u64
*remainder
)
122 while (dividend
>= divisor
) {
123 /* The following asm() prevents the compiler from
124 optimising this loop into a modulo operation. */
125 asm("" : "+rm"(dividend
));
131 *remainder
= dividend
;
136 #if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
138 #ifndef mul_u64_u32_shr
139 static inline u64
mul_u64_u32_shr(u64 a
, u32 mul
, unsigned int shift
)
141 return (u64
)(((unsigned __int128
)a
* mul
) >> shift
);
143 #endif /* mul_u64_u32_shr */
147 #ifndef mul_u64_u32_shr
148 static inline u64
mul_u64_u32_shr(u64 a
, u32 mul
, unsigned int shift
)
156 ret
= ((u64
)al
* mul
) >> shift
;
158 ret
+= ((u64
)ah
* mul
) << (32 - shift
);
162 #endif /* mul_u64_u32_shr */
166 #endif /* _LINUX_MATH64_H */
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