1/* Copyright (c) 2002, 2005, 2006, 2007 Marek Michalkiewicz
2   All rights reserved.
3
4   Redistribution and use in source and binary forms, with or without
5   modification, are permitted provided that the following conditions are met:
6
7   * Redistributions of source code must retain the above copyright
8     notice, this list of conditions and the following disclaimer.
9   * Redistributions in binary form must reproduce the above copyright
10     notice, this list of conditions and the following disclaimer in
11     the documentation and/or other materials provided with the
12     distribution.
13   * Neither the name of the copyright holders nor the names of
14     contributors may be used to endorse or promote products derived
15     from this software without specific prior written permission.
16
17  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27  POSSIBILITY OF SUCH DAMAGE. */
28
29/* $Id: memcpy_P.S 2503 2016-02-07 22:59:47Z joerg_wunsch $ */
30
31
32
33#if !defined(__AVR_TINY__)
34
35#if !defined(__DOXYGEN__)
36
37#include "macros.inc"
38
39#define dest_hi r25
40#define dest_lo r24
41#define src_hi r23
42#define src_lo r22
43#define len_hi r21
44#define len_lo r20
45
46	ASSEMBLY_CLIB_SECTION
47	.global	_U(memcpy_P)
48	.type	_U(memcpy_P), @function
49_U(memcpy_P):
50	X_movw	ZL, src_lo
51	X_movw	XL, dest_lo
52#if OPTIMIZE_SPEED
53; 17 words, (14 + len * 9 - (len & 1)) cycles
54	sbrs	len_lo, 0
55	rjmp	.L_memcpy_P_start
56	rjmp	.L_memcpy_P_odd
57.L_memcpy_P_loop:
58	X_lpm	r0, Z+
59	st	X+, r0
60.L_memcpy_P_odd:
61	X_lpm	r0, Z+
62	st	X+, r0
63.L_memcpy_P_start:
64	subi	len_lo, lo8(2)
65	sbci	len_hi, hi8(2)
66#else
67; 12 words, (13 + len * 11) cycles
68	rjmp	.L_memcpy_P_start
69.L_memcpy_P_loop:
70	X_lpm	r0, Z+
71	st	X+, r0
72.L_memcpy_P_start:
73	subi	len_lo, lo8(1)
74	sbci	len_hi, hi8(1)
75#endif
76	brcc	.L_memcpy_P_loop
77; return dest (unchanged)
78	ret
79.L_memcpy_P_end:
80	.size	_U(memcpy_P), .L_memcpy_P_end - _U(memcpy_P)
81
82#endif /* not __DOXYGEN__ */
83
84#endif /* !defined(__AVR_TINY__) */
85