div64.h (c203e45f069af47ca7623e4dcd8c00bfba2722e4) div64.h (911918aa7ef6f868c135505b0015e42072c54682)
1#ifndef _ASM_GENERIC_DIV64_H
2#define _ASM_GENERIC_DIV64_H
3/*
4 * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com>
5 * Based on former asm-ppc/div64.h and asm-m68knommu/div64.h
6 *
7 * The semantics of do_div() are:
8 *

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27 uint32_t __rem; \
28 __rem = ((uint64_t)(n)) % __base; \
29 (n) = ((uint64_t)(n)) / __base; \
30 __rem; \
31 })
32
33#elif BITS_PER_LONG == 32
34
1#ifndef _ASM_GENERIC_DIV64_H
2#define _ASM_GENERIC_DIV64_H
3/*
4 * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com>
5 * Based on former asm-ppc/div64.h and asm-m68knommu/div64.h
6 *
7 * The semantics of do_div() are:
8 *

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27 uint32_t __rem; \
28 __rem = ((uint64_t)(n)) % __base; \
29 (n) = ((uint64_t)(n)) / __base; \
30 __rem; \
31 })
32
33#elif BITS_PER_LONG == 32
34
35#include <linux/log2.h>
36
35extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
36
37/* The unnecessary pointer compare is there
38 * to check for type safety (n must be 64bit)
39 */
40# define do_div(n,base) ({ \
41 uint32_t __base = (base); \
42 uint32_t __rem; \
43 (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
37extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
38
39/* The unnecessary pointer compare is there
40 * to check for type safety (n must be 64bit)
41 */
42# define do_div(n,base) ({ \
43 uint32_t __base = (base); \
44 uint32_t __rem; \
45 (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
44 if (likely(((n) >> 32) == 0)) { \
46 if (__builtin_constant_p(__base) && \
47 is_power_of_2(__base)) { \
48 __rem = (n) & (__base - 1); \
49 (n) >>= ilog2(__base); \
50 } else if (likely(((n) >> 32) == 0)) { \
45 __rem = (uint32_t)(n) % __base; \
46 (n) = (uint32_t)(n) / __base; \
47 } else \
48 __rem = __div64_32(&(n), __base); \
49 __rem; \
50 })
51
52#else /* BITS_PER_LONG == ?? */
53
54# error do_div() does not yet support the C64
55
56#endif /* BITS_PER_LONG */
57
58#endif /* _ASM_GENERIC_DIV64_H */
51 __rem = (uint32_t)(n) % __base; \
52 (n) = (uint32_t)(n) / __base; \
53 } else \
54 __rem = __div64_32(&(n), __base); \
55 __rem; \
56 })
57
58#else /* BITS_PER_LONG == ?? */
59
60# error do_div() does not yet support the C64
61
62#endif /* BITS_PER_LONG */
63
64#endif /* _ASM_GENERIC_DIV64_H */