1/*******************************************************************************
2 *
3 * Copyright (c) 1993 Intel Corporation
4 *
5 * Intel hereby grants you permission to copy, modify, and distribute this
6 * software and its documentation.  Intel grants this permission provided
7 * that the above copyright notice appears in all copies and that both the
8 * copyright notice and this permission notice appear in supporting
9 * documentation.  In addition, Intel grants this permission provided that
10 * you prominently mark as "not part of the original" any modifications
11 * made to this software or documentation, and that the name of Intel
12 * Corporation not be used in advertising or publicity pertaining to
13 * distribution of the software or the documentation without specific,
14 * written prior permission.
15 *
16 * Intel Corporation provides this AS IS, WITHOUT ANY WARRANTY, EXPRESS OR
17 * IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY
18 * OR FITNESS FOR A PARTICULAR PURPOSE.  Intel makes no guarantee or
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20 * the software and documentation in terms of correctness, accuracy,
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22 * documentation and results solely at your own risk.
23 *
24 * IN NO EVENT SHALL INTEL BE LIABLE FOR ANY LOSS OF USE, LOSS OF BUSINESS,
25 * LOSS OF PROFITS, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES
26 * OF ANY KIND.  IN NO EVENT SHALL INTEL'S TOTAL LIABILITY EXCEED THE SUM
27 * PAID TO INTEL FOR THE PRODUCT LICENSED HEREUNDER.
28 *
29 ******************************************************************************/
30
31	.file "memset.s"
32#ifdef	__PIC
33	.pic
34#endif
35#ifdef	__PID
36	.pid
37#endif
38/*
39 * (c) copyright 1989,1993 Intel Corp., all rights reserved
40 */
41
42/*
43	procedure memset  (optimized assembler version: 80960K series, 80960CA)
44
45	dest_addr = memset (dest_addr, char, len)
46
47	Fill len bytes pointed to by dest_addr with the value of char.
48        Return the original address of dest_addr.
49
50        This program avoids performing unaligned accesses.  It stores
51        from zero to seven bytes, and then stores aligned longwords,
52        and then stores from zero to seven bytes, as necessary to
53        store len bytes starting at dest_addr.
54
55	At the time of this writing, only g0 thru g7 and g13 are available
56	for use in this leafproc;  other registers would have to be saved and
57	restored.  These nine registers, plus tricky use of g14 are sufficient
58	to implement the routine.
59*/
60
61	.globl	_memset
62	.globl	__memset
63	.leafproc	_memset, __memset
64	.align	2
65_memset:
66#ifndef __PIC
67	lda 	Lrett,g14
68#else
69	lda 	Lrett-(.+8)(ip),g14
70#endif
71__memset:
72	cmpo	7,g2		# are there fewer than seven characters to move?
73	 lda	(g14),g13	# save return address
74	notand	g0,7,g3		# test for non-aligned dest_ptr
75	 lda	0,g14		# conform to register conventions
76	shlo	24,g1,g4	# prepare word of char
77	 lda	(g0),g6		# preserve dest_ptr for return
78	shro	8,g4,g5
79	 bge.f	Lcloop_setup
80	cmpo	g3,g0		# is dest longword aligned
81	 lda	7(g3),g3	# bump dest_ptr to next longword boundary
82	or	g4,g5,g4
83	 be.t	Lwloop_setup
84
85Lbgn_cloop:
86	cmpo	g6,g3		# Have we reached longword boundary?
87	 stob	g1,(g6)		# store one byte of char
88	subo	1,g2,g2		# decrement len
89	 lda	1(g6),g6	# increment dest_ptr
90	bne.t	Lbgn_cloop	# loop if more bytes to store before longword
91
92	cmpobge.f 7,g2,Lcloop
93
94Lwloop_setup:
95	shro	16,g4,g5
96	or	g4,g5,g4
97	mov	g4,g5		# now have a longword of char
98
99Lwloop:
100	cmpo	15,g2		# Do we have to store more longwords?
101	 stl	g4,(g6)		# Store longword of char
102	subo	8,g2,g2		# Decrement len
103	 lda	8(g6),g6	# Increment dest_ptr
104	bl.t	Lwloop		# loop if more longwords to store
105
106Lcloop_setup:
107	cmpobge.t 0,g2,Lexit
108
109Lcloop:
110	cmpo	1,g2		# Is len exhausted?
111	 stob	g1,(g6)		# Store byte
112	subo	1,g2,g2		# Decrement len
113	 lda	1(g6),g6	# Increment dest_ptr
114	bne.t	Lcloop		# loop if more bytes to store
115
116Lexit:
117	bx	(g13)
118Lrett:
119	ret
120
121/* end of memset */
122