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eb855956 | 1 | /* memcopy.h -- definitions for memory copy functions. Motorola 68020 version. |
b168057a | 2 | Copyright (C) 1991-2015 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 PE |
17 | License along with the GNU C Library. If not, see |
18 | <http://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]; \ | |
42 | case 7: \ | |
43 | ((op_t *) dst_bp)[1] = ((op_t *) src_bp)[1]; \ | |
44 | case 6: \ | |
45 | ((op_t *) dst_bp)[2] = ((op_t *) src_bp)[2]; \ | |
46 | case 5: \ | |
47 | ((op_t *) dst_bp)[3] = ((op_t *) src_bp)[3]; \ | |
48 | case 4: \ | |
49 | ((op_t *) dst_bp)[4] = ((op_t *) src_bp)[4]; \ | |
50 | case 3: \ | |
51 | ((op_t *) dst_bp)[5] = ((op_t *) src_bp)[5]; \ | |
52 | case 2: \ | |
53 | ((op_t *) dst_bp)[6] = ((op_t *) src_bp)[6]; \ | |
54 | case 1: \ | |
55 | ((op_t *) dst_bp)[7] = ((op_t *) src_bp)[7]; \ | |
56 | case 0: \ | |
57 | src_bp += 32; \ | |
58 | dst_bp += 32; \ | |
59 | __nblocks--; \ | |
60 | } \ | |
61 | while (__nblocks != 0); \ | |
62 | (nbytes_left) = (nbytes) % sizeof (op_t); \ | |
63 | } while (0) | |
64 | ||
65 | #undef WORD_COPY_BWD | |
66 | #define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \ | |
67 | do \ | |
68 | { \ | |
69 | size_t __nblocks = (nbytes) / 32 + 1; \ | |
6ffbfb80 AS |
70 | op_t *__dst_ep = (op_t *) (dst_ep); \ |
71 | op_t *__src_ep = (op_t *) (src_ep); \ | |
c7486d0b | 72 | switch ((nbytes) / sizeof (op_t) % 8) \ |
eb855956 RM |
73 | do \ |
74 | { \ | |
6ffbfb80 | 75 | *--__dst_ep = *--__src_ep; \ |
eb855956 | 76 | case 7: \ |
6ffbfb80 | 77 | *--__dst_ep = *--__src_ep; \ |
eb855956 | 78 | case 6: \ |
6ffbfb80 | 79 | *--__dst_ep = *--__src_ep; \ |
eb855956 | 80 | case 5: \ |
6ffbfb80 | 81 | *--__dst_ep = *--__src_ep; \ |
eb855956 | 82 | case 4: \ |
6ffbfb80 | 83 | *--__dst_ep = *--__src_ep; \ |
eb855956 | 84 | case 3: \ |
6ffbfb80 | 85 | *--__dst_ep = *--__src_ep; \ |
eb855956 | 86 | case 2: \ |
6ffbfb80 | 87 | *--__dst_ep = *--__src_ep; \ |
eb855956 | 88 | case 1: \ |
6ffbfb80 | 89 | *--__dst_ep = *--__src_ep; \ |
eb855956 RM |
90 | case 0: \ |
91 | __nblocks--; \ | |
92 | } \ | |
93 | while (__nblocks != 0); \ | |
94 | (nbytes_left) = (nbytes) % sizeof (op_t); \ | |
6ffbfb80 AS |
95 | (dst_ep) = (unsigned long) __dst_ep; \ |
96 | (src_ep) = (unsigned long) __src_ep; \ | |
eb855956 RM |
97 | } while (0) |
98 | ||
99 | #endif |