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| 1 | /* memcopy.h -- definitions for memory copy functions. Motorola 68020 version. |
|---|---|
| 2 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library. If not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <sysdeps/generic/memcopy.h> |
| 20 | |
| 21 | #if defined(__mc68020__) || defined(mc68020) |
| 22 | |
| 23 | #undef OP_T_THRES |
| 24 | #define OP_T_THRES 16 |
| 25 | |
| 26 | /* WORD_COPY_FWD and WORD_COPY_BWD are not symmetric on the 68020, |
| 27 | because of its weird instruction overlap characteristics. */ |
| 28 | |
| 29 | #undef WORD_COPY_FWD |
| 30 | #define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \ |
| 31 | do \ |
| 32 | { \ |
| 33 | size_t __nwords = (nbytes) / sizeof (op_t); \ |
| 34 | size_t __nblocks = __nwords / 8 + 1; \ |
| 35 | dst_bp -= (8 - __nwords % 8) * sizeof (op_t); \ |
| 36 | src_bp -= (8 - __nwords % 8) * sizeof (op_t); \ |
| 37 | switch (__nwords % 8) \ |
| 38 | do \ |
| 39 | { \ |
| 40 | ((op_t *) dst_bp)[0] = ((op_t *) src_bp)[0]; \ |
| 41 | /* Fall through. */ \ |
| 42 | case 7: \ |
| 43 | ((op_t *) dst_bp)[1] = ((op_t *) src_bp)[1]; \ |
| 44 | /* Fall through. */ \ |
| 45 | case 6: \ |
| 46 | ((op_t *) dst_bp)[2] = ((op_t *) src_bp)[2]; \ |
| 47 | /* Fall through. */ \ |
| 48 | case 5: \ |
| 49 | ((op_t *) dst_bp)[3] = ((op_t *) src_bp)[3]; \ |
| 50 | /* Fall through. */ \ |
| 51 | case 4: \ |
| 52 | ((op_t *) dst_bp)[4] = ((op_t *) src_bp)[4]; \ |
| 53 | /* Fall through. */ \ |
| 54 | case 3: \ |
| 55 | ((op_t *) dst_bp)[5] = ((op_t *) src_bp)[5]; \ |
| 56 | /* Fall through. */ \ |
| 57 | case 2: \ |
| 58 | ((op_t *) dst_bp)[6] = ((op_t *) src_bp)[6]; \ |
| 59 | /* Fall through. */ \ |
| 60 | case 1: \ |
| 61 | ((op_t *) dst_bp)[7] = ((op_t *) src_bp)[7]; \ |
| 62 | /* Fall through. */ \ |
| 63 | case 0: \ |
| 64 | src_bp += 32; \ |
| 65 | dst_bp += 32; \ |
| 66 | __nblocks--; \ |
| 67 | } \ |
| 68 | while (__nblocks != 0); \ |
| 69 | (nbytes_left) = (nbytes) % sizeof (op_t); \ |
| 70 | } while (0) |
| 71 | |
| 72 | #undef WORD_COPY_BWD |
| 73 | #define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \ |
| 74 | do \ |
| 75 | { \ |
| 76 | size_t __nblocks = (nbytes) / 32 + 1; \ |
| 77 | op_t *__dst_ep = (op_t *) (dst_ep); \ |
| 78 | op_t *__src_ep = (op_t *) (src_ep); \ |
| 79 | switch ((nbytes) / sizeof (op_t) % 8) \ |
| 80 | do \ |
| 81 | { \ |
| 82 | *--__dst_ep = *--__src_ep; \ |
| 83 | /* Fall through. */ \ |
| 84 | case 7: \ |
| 85 | *--__dst_ep = *--__src_ep; \ |
| 86 | /* Fall through. */ \ |
| 87 | case 6: \ |
| 88 | *--__dst_ep = *--__src_ep; \ |
| 89 | /* Fall through. */ \ |
| 90 | case 5: \ |
| 91 | *--__dst_ep = *--__src_ep; \ |
| 92 | /* Fall through. */ \ |
| 93 | case 4: \ |
| 94 | *--__dst_ep = *--__src_ep; \ |
| 95 | /* Fall through. */ \ |
| 96 | case 3: \ |
| 97 | *--__dst_ep = *--__src_ep; \ |
| 98 | /* Fall through. */ \ |
| 99 | case 2: \ |
| 100 | *--__dst_ep = *--__src_ep; \ |
| 101 | /* Fall through. */ \ |
| 102 | case 1: \ |
| 103 | *--__dst_ep = *--__src_ep; \ |
| 104 | /* Fall through. */ \ |
| 105 | case 0: \ |
| 106 | __nblocks--; \ |
| 107 | } \ |
| 108 | while (__nblocks != 0); \ |
| 109 | (nbytes_left) = (nbytes) % sizeof (op_t); \ |
| 110 | (dst_ep) = (unsigned long) __dst_ep; \ |
| 111 | (src_ep) = (unsigned long) __src_ep; \ |
| 112 | } while (0) |
| 113 | |
| 114 | #endif |
| 115 |
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