]>
Commit | Line | Data |
---|---|---|
28f540f4 | 1 | /* memcopy.h -- definitions for memory copy functions. i386 version. |
04277e02 | 2 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
478b92f0 | 3 | This file is part of the GNU C Library. |
28f540f4 RM |
4 | Contributed by Torbjorn Granlund (tege@sics.se). |
5 | ||
478b92f0 | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 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. | |
28f540f4 | 10 | |
478b92f0 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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
28f540f4 | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 RM |
19 | |
20 | #include <sysdeps/generic/memcopy.h> | |
21 | ||
22 | #undef OP_T_THRES | |
23 | #define OP_T_THRES 8 | |
24 | ||
25 | #undef BYTE_COPY_FWD | |
26 | #define BYTE_COPY_FWD(dst_bp, src_bp, nbytes) \ | |
6dbb7062 UD |
27 | do { \ |
28 | int __d0; \ | |
29 | asm volatile(/* Clear the direction flag, so copying goes forward. */ \ | |
30 | "cld\n" \ | |
31 | /* Copy bytes. */ \ | |
32 | "rep\n" \ | |
33 | "movsb" : \ | |
34 | "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \ | |
35 | "0" (dst_bp), "1" (src_bp), "2" (nbytes) : \ | |
36 | "memory"); \ | |
37 | } while (0) | |
28f540f4 RM |
38 | |
39 | #undef BYTE_COPY_BWD | |
40 | #define BYTE_COPY_BWD(dst_ep, src_ep, nbytes) \ | |
41 | do \ | |
42 | { \ | |
6dbb7062 | 43 | int __d0; \ |
28f540f4 RM |
44 | asm volatile(/* Set the direction flag, so copying goes backwards. */ \ |
45 | "std\n" \ | |
46 | /* Copy bytes. */ \ | |
47 | "rep\n" \ | |
48 | "movsb\n" \ | |
49 | /* Clear the dir flag. Convention says it should be 0. */ \ | |
50 | "cld" : \ | |
6dbb7062 UD |
51 | "=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \ |
52 | "0" (dst_ep - 1), "1" (src_ep - 1), "2" (nbytes) : \ | |
53 | "memory"); \ | |
28f540f4 RM |
54 | dst_ep += 1; \ |
55 | src_ep += 1; \ | |
56 | } while (0) | |
57 | ||
58 | #undef WORD_COPY_FWD | |
59 | #define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \ | |
60 | do \ | |
61 | { \ | |
6dbb7062 | 62 | int __d0; \ |
28f540f4 RM |
63 | asm volatile(/* Clear the direction flag, so copying goes forward. */ \ |
64 | "cld\n" \ | |
65 | /* Copy longwords. */ \ | |
66 | "rep\n" \ | |
67 | "movsl" : \ | |
6dbb7062 UD |
68 | "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \ |
69 | "0" (dst_bp), "1" (src_bp), "2" ((nbytes) / 4) : \ | |
70 | "memory"); \ | |
28f540f4 RM |
71 | (nbytes_left) = (nbytes) % 4; \ |
72 | } while (0) | |
73 | ||
74 | #undef WORD_COPY_BWD | |
75 | #define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \ | |
76 | do \ | |
77 | { \ | |
6dbb7062 | 78 | int __d0; \ |
28f540f4 RM |
79 | asm volatile(/* Set the direction flag, so copying goes backwards. */ \ |
80 | "std\n" \ | |
81 | /* Copy longwords. */ \ | |
82 | "rep\n" \ | |
83 | "movsl\n" \ | |
84 | /* Clear the dir flag. Convention says it should be 0. */ \ | |
85 | "cld" : \ | |
6dbb7062 UD |
86 | "=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \ |
87 | "0" (dst_ep - 4), "1" (src_ep - 4), "2" ((nbytes) / 4) : \ | |
88 | "memory"); \ | |
28f540f4 RM |
89 | dst_ep += 4; \ |
90 | src_ep += 4; \ | |
91 | (nbytes_left) = (nbytes) % 4; \ | |
92 | } while (0) |