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eb855956 | 1 | /* memcopy.h -- definitions for memory copy functions. Motorola 68020 version. |
2b778ceb | 2 | Copyright (C) 1991-2021 Free Software Foundation, Inc. |
36e28152 | 3 | This file is part of the GNU C Library. |
eb855956 RM |
4 | Contributed by Torbjorn Granlund (tege@sics.se). |
5 | ||
36e28152 | 6 | The GNU C Library is free software; you can redistribute it and/or |
3214b89b AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
eb855956 | 10 | |
36e28152 UD |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
3214b89b | 14 | Lesser General Public License for more details. |
eb855956 | 15 | |
3214b89b | 16 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff | 17 | License along with the GNU C Library. If not, see |
5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
eb855956 RM |
19 | |
20 | #include <sysdeps/generic/memcopy.h> | |
21 | ||
22 | #if defined(__mc68020__) || defined(mc68020) | |
23 | ||
24 | #undef OP_T_THRES | |
25 | #define OP_T_THRES 16 | |
26 | ||
27 | /* WORD_COPY_FWD and WORD_COPY_BWD are not symmetric on the 68020, | |
28 | because of its weird instruction overlap characteristics. */ | |
29 | ||
30 | #undef WORD_COPY_FWD | |
31 | #define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \ | |
32 | do \ | |
33 | { \ | |
34 | size_t __nwords = (nbytes) / sizeof (op_t); \ | |
35 | size_t __nblocks = __nwords / 8 + 1; \ | |
36 | dst_bp -= (8 - __nwords % 8) * sizeof (op_t); \ | |
37 | src_bp -= (8 - __nwords % 8) * sizeof (op_t); \ | |
38 | switch (__nwords % 8) \ | |
39 | do \ | |
40 | { \ | |
41 | ((op_t *) dst_bp)[0] = ((op_t *) src_bp)[0]; \ | |
e0cb7b61 | 42 | /* Fall through. */ \ |
eb855956 RM |
43 | case 7: \ |
44 | ((op_t *) dst_bp)[1] = ((op_t *) src_bp)[1]; \ | |
e0cb7b61 | 45 | /* Fall through. */ \ |
eb855956 RM |
46 | case 6: \ |
47 | ((op_t *) dst_bp)[2] = ((op_t *) src_bp)[2]; \ | |
e0cb7b61 | 48 | /* Fall through. */ \ |
eb855956 RM |
49 | case 5: \ |
50 | ((op_t *) dst_bp)[3] = ((op_t *) src_bp)[3]; \ | |
e0cb7b61 | 51 | /* Fall through. */ \ |
eb855956 RM |
52 | case 4: \ |
53 | ((op_t *) dst_bp)[4] = ((op_t *) src_bp)[4]; \ | |
e0cb7b61 | 54 | /* Fall through. */ \ |
eb855956 RM |
55 | case 3: \ |
56 | ((op_t *) dst_bp)[5] = ((op_t *) src_bp)[5]; \ | |
e0cb7b61 | 57 | /* Fall through. */ \ |
eb855956 RM |
58 | case 2: \ |
59 | ((op_t *) dst_bp)[6] = ((op_t *) src_bp)[6]; \ | |
e0cb7b61 | 60 | /* Fall through. */ \ |
eb855956 RM |
61 | case 1: \ |
62 | ((op_t *) dst_bp)[7] = ((op_t *) src_bp)[7]; \ | |
e0cb7b61 | 63 | /* Fall through. */ \ |
eb855956 RM |
64 | case 0: \ |
65 | src_bp += 32; \ | |
66 | dst_bp += 32; \ | |
67 | __nblocks--; \ | |
68 | } \ | |
69 | while (__nblocks != 0); \ | |
70 | (nbytes_left) = (nbytes) % sizeof (op_t); \ | |
71 | } while (0) | |
72 | ||
73 | #undef WORD_COPY_BWD | |
74 | #define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \ | |
75 | do \ | |
76 | { \ | |
77 | size_t __nblocks = (nbytes) / 32 + 1; \ | |
6ffbfb80 AS |
78 | op_t *__dst_ep = (op_t *) (dst_ep); \ |
79 | op_t *__src_ep = (op_t *) (src_ep); \ | |
c7486d0b | 80 | switch ((nbytes) / sizeof (op_t) % 8) \ |
eb855956 RM |
81 | do \ |
82 | { \ | |
6ffbfb80 | 83 | *--__dst_ep = *--__src_ep; \ |
e0cb7b61 | 84 | /* Fall through. */ \ |
eb855956 | 85 | case 7: \ |
6ffbfb80 | 86 | *--__dst_ep = *--__src_ep; \ |
e0cb7b61 | 87 | /* Fall through. */ \ |
eb855956 | 88 | case 6: \ |
6ffbfb80 | 89 | *--__dst_ep = *--__src_ep; \ |
e0cb7b61 | 90 | /* Fall through. */ \ |
eb855956 | 91 | case 5: \ |
6ffbfb80 | 92 | *--__dst_ep = *--__src_ep; \ |
e0cb7b61 | 93 | /* Fall through. */ \ |
eb855956 | 94 | case 4: \ |
6ffbfb80 | 95 | *--__dst_ep = *--__src_ep; \ |
e0cb7b61 | 96 | /* Fall through. */ \ |
eb855956 | 97 | case 3: \ |
6ffbfb80 | 98 | *--__dst_ep = *--__src_ep; \ |
e0cb7b61 | 99 | /* Fall through. */ \ |
eb855956 | 100 | case 2: \ |
6ffbfb80 | 101 | *--__dst_ep = *--__src_ep; \ |
e0cb7b61 | 102 | /* Fall through. */ \ |
eb855956 | 103 | case 1: \ |
6ffbfb80 | 104 | *--__dst_ep = *--__src_ep; \ |
e0cb7b61 | 105 | /* Fall through. */ \ |
eb855956 RM |
106 | case 0: \ |
107 | __nblocks--; \ | |
108 | } \ | |
109 | while (__nblocks != 0); \ | |
110 | (nbytes_left) = (nbytes) % sizeof (op_t); \ | |
6ffbfb80 AS |
111 | (dst_ep) = (unsigned long) __dst_ep; \ |
112 | (src_ep) = (unsigned long) __src_ep; \ | |
eb855956 RM |
113 | } while (0) |
114 | ||
115 | #endif |