New (empty) file.
[kopensolaris-gnu/glibc.git] / sysdeps / m68k / memcopy.h
1 /* memcopy.h -- definitions for memory copy functions.  Motorola 68020 version.
2    Copyright (C) 1991, 1997 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4    Contributed by Torbjorn Granlund (tege@sics.se).
5
6    The GNU C Library is free software; you can redistribute it and/or
7    modify it under the terms of the GNU Library General Public License as
8    published by the Free Software Foundation; either version 2 of the
9    License, or (at your option) any later version.
10
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
14    Library General Public License for more details.
15
16    You should have received a copy of the GNU Library General Public
17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19    Boston, MA 02111-1307, USA.  */
20
21 #include <sysdeps/generic/memcopy.h>
22
23 #if     defined(__mc68020__) || defined(mc68020)
24
25 #undef  OP_T_THRES
26 #define OP_T_THRES      16
27
28 /* WORD_COPY_FWD and WORD_COPY_BWD are not symmetric on the 68020,
29    because of its weird instruction overlap characteristics.  */
30
31 #undef  WORD_COPY_FWD
32 #define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes)                    \
33   do                                                                          \
34     {                                                                         \
35       size_t __nwords = (nbytes) / sizeof (op_t);                             \
36       size_t __nblocks = __nwords / 8 + 1;                                    \
37       dst_bp -= (8 - __nwords % 8) * sizeof (op_t);                           \
38       src_bp -= (8 - __nwords % 8) * sizeof (op_t);                           \
39       switch (__nwords % 8)                                                   \
40         do                                                                    \
41           {                                                                   \
42             ((op_t *) dst_bp)[0] = ((op_t *) src_bp)[0];                      \
43           case 7:                                                             \
44             ((op_t *) dst_bp)[1] = ((op_t *) src_bp)[1];                      \
45           case 6:                                                             \
46             ((op_t *) dst_bp)[2] = ((op_t *) src_bp)[2];                      \
47           case 5:                                                             \
48             ((op_t *) dst_bp)[3] = ((op_t *) src_bp)[3];                      \
49           case 4:                                                             \
50             ((op_t *) dst_bp)[4] = ((op_t *) src_bp)[4];                      \
51           case 3:                                                             \
52             ((op_t *) dst_bp)[5] = ((op_t *) src_bp)[5];                      \
53           case 2:                                                             \
54             ((op_t *) dst_bp)[6] = ((op_t *) src_bp)[6];                      \
55           case 1:                                                             \
56             ((op_t *) dst_bp)[7] = ((op_t *) src_bp)[7];                      \
57           case 0:                                                             \
58             src_bp += 32;                                                     \
59             dst_bp += 32;                                                     \
60             __nblocks--;                                                      \
61           }                                                                   \
62       while (__nblocks != 0);                                                 \
63       (nbytes_left) = (nbytes) % sizeof (op_t);                               \
64     } while (0)
65
66 #undef  WORD_COPY_BWD
67 #define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes)                    \
68   do                                                                          \
69     {                                                                         \
70       size_t __nblocks = (nbytes) / 32 + 1;                                   \
71       switch ((nbytes) / sizeof (op_t) % 8)                                   \
72         do                                                                    \
73           {                                                                   \
74             *--((op_t *) dst_ep) = *--((op_t *) src_ep);                      \
75           case 7:                                                             \
76             *--((op_t *) dst_ep) = *--((op_t *) src_ep);                      \
77           case 6:                                                             \
78             *--((op_t *) dst_ep) = *--((op_t *) src_ep);                      \
79           case 5:                                                             \
80             *--((op_t *) dst_ep) = *--((op_t *) src_ep);                      \
81           case 4:                                                             \
82             *--((op_t *) dst_ep) = *--((op_t *) src_ep);                      \
83           case 3:                                                             \
84             *--((op_t *) dst_ep) = *--((op_t *) src_ep);                      \
85           case 2:                                                             \
86             *--((op_t *) dst_ep) = *--((op_t *) src_ep);                      \
87           case 1:                                                             \
88             *--((op_t *) dst_ep) = *--((op_t *) src_ep);                      \
89           case 0:                                                             \
90             __nblocks--;                                                      \
91           }                                                                   \
92       while (__nblocks != 0);                                                 \
93       (nbytes_left) = (nbytes) % sizeof (op_t);                               \
94     } while (0)
95
96 #endif