1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_MATH64_H
3 #define _LINUX_MATH64_H
5 #include <linux/types.h>
8 static inline u64 mul_u64_u64_div64(u64 a, u64 b, u64 c)
12 asm ("mulq %2; divq %3" : "=a" (q)
13 : "a" (a), "rm" (b), "rm" (c)
18 #define mul_u64_u64_div64 mul_u64_u64_div64
21 #ifdef __SIZEOF_INT128__
22 static inline u64 mul_u64_u32_shr(u64 a, u32 b, unsigned int shift)
24 return (u64)(((unsigned __int128)a * b) >> shift);
30 static inline u64 mul_u32_u32(u32 a, u32 b)
34 asm ("mull %[b]" : "=a" (low), "=d" (high)
35 : [a] "a" (a), [b] "rm" (b) );
37 return low | ((u64)high) << 32;
40 static inline u64 mul_u32_u32(u32 a, u32 b)
46 static inline u64 mul_u64_u32_shr(u64 a, u32 b, unsigned int shift)
54 ret = mul_u32_u32(al, b) >> shift;
56 ret += mul_u32_u32(ah, b) << (32 - shift);
61 #endif /* __SIZEOF_INT128__ */
63 #ifndef mul_u64_u64_div64
64 static inline u64 mul_u64_u64_div64(u64 a, u64 b, u64 c)
71 return quot * b + (rem * b) / c;
75 #endif /* _LINUX_MATH64_H */