include/linux/math64.h

16  * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
17  * @dividend: unsigned 64bit dividend
18  * @divisor: unsigned 32bit divisor
19  * @remainder: pointer to unsigned 32bit remainder
23  * This is commonly provided by 32bit archs to provide an optimized 64bit
33  * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
34  * @dividend: signed 64bit dividend
35  * @divisor: signed 32bit divisor
36  * @remainder: pointer to signed 32bit remainder
47  * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
48  * @dividend: unsigned 64bit dividend
49  * @divisor: unsigned 64bit divisor
50  * @remainder: pointer to unsigned 64bit remainder
61  * div64_u64 - unsigned 64bit divide with 64bit divisor
62  * @dividend: unsigned 64bit dividend
63  * @divisor: unsigned 64bit divisor
73  * div64_s64 - signed 64bit divide with 64bit divisor
74  * @dividend: signed 64bit dividend
75  * @divisor: signed 64bit divisor
84 #elif BITS_PER_LONG == 32
116  * div_u64 - unsigned 64bit divide with 32bit divisor
117  * @dividend: unsigned 64bit dividend
118  * @divisor: unsigned 32bit divisor
120  * This is the most common 64bit divide and should be used if possible,
121  * as many 32bit archs can optimize this variant better than a full 64bit
135  * div_s64 - signed 64bit divide with 32bit divisor
136  * @dividend: signed 64bit dividend
137  * @divisor: signed 32bit divisor
193 	u32 ah = a >> 32, al = a;  in mul_u64_u32_shr()
198 		ret += mul_u32_u32(ah, mul) << (32 - shift);  in mul_u64_u32_shr()
227 	 * Each of these lines computes a 64-bit intermediate result into "c",  in mul_u64_u64_shr()
228 	 * starting at bits 32-95.  The low 32-bits go into the result of the  in mul_u64_u64_shr()
229 	 * multiplication, the high 32-bits are carried into the next step.  in mul_u64_u64_shr()
232 	rh.l.low = c = (c >> 32) + rm.l.high + rn.l.high + rh.l.low;  in mul_u64_u64_shr()
233 	rh.l.high = (c >> 32) + rh.l.high;  in mul_u64_u64_shr()
236 	 * The 128-bit result of the multiplication is in rl.ll and rh.ll,  in mul_u64_u64_shr()
285 	/* Bits 32-63 of the result will be in rh.l.low. */  in mul_u64_u32_div()
297  * mul_u64_add_u64_div_u64 - unsigned 64bit multiply, add, and divide
298  * @a: first unsigned 64bit multiplicand
299  * @b: second unsigned 64bit multiplicand
300  * @c: unsigned 64bit addend
301  * @d: unsigned 64bit divisor
303  * Multiply two 64bit values together to generate a 128bit product
313  * mul_u64_u64_div_u64 - unsigned 64bit multiply and divide
314  * @a: first unsigned 64bit multiplicand
315  * @b: second unsigned 64bit multiplicand
316  * @d: unsigned 64bit divisor
318  * Multiply two 64bit values together to generate a 128bit product
328  * mul_u64_u64_div_u64_roundup - unsigned 64bit multiply and divide rounded up
329  * @a: first unsigned 64bit multiplicand
330  * @b: second unsigned 64bit multiplicand
331  * @d: unsigned 64bit divisor
333  * Multiply two 64bit values together to generate a 128bit product
345  * DIV64_U64_ROUND_UP - unsigned 64bit divide with 64bit divisor rounded up
346  * @ll: unsigned 64bit dividend
347  * @d: unsigned 64bit divisor
349  * Divide unsigned 64bit dividend by unsigned 64bit divisor
358  * DIV_U64_ROUND_UP - unsigned 64bit divide with 32bit divisor rounded up
359  * @ll: unsigned 64bit dividend
360  * @d: unsigned 32bit divisor
362  * Divide unsigned 64bit dividend by unsigned 32bit divisor
371  * DIV64_U64_ROUND_CLOSEST - unsigned 64bit divide with 64bit divisor rounded to nearest integer
372  * @dividend: unsigned 64bit dividend
373  * @divisor: unsigned 64bit divisor
375  * Divide unsigned 64bit dividend by unsigned 64bit divisor
384  * DIV_U64_ROUND_CLOSEST - unsigned 64bit divide with 32bit divisor rounded to nearest integer
385  * @dividend: unsigned 64bit dividend
386  * @divisor: unsigned 32bit divisor
388  * Divide unsigned 64bit dividend by unsigned 32bit divisor
397  * DIV_S64_ROUND_CLOSEST - signed 64bit divide with 32bit divisor rounded to nearest integer
398  * @dividend: signed 64bit dividend
399  * @divisor: signed 32bit divisor
401  * Divide signed 64bit dividend by signed 32bit divisor
417  * roundup_u64 - Round up a 64bit value to the next specified 32bit multiple
419  * @y: 32bit multiple to round up to
421  * Rounds @x to the next multiple of @y. For 32bit @x values, see roundup and