1dnl  S/390-32 mpn_copyi
2
3dnl  Copyright 2011 Free Software Foundation, Inc.
4
5dnl  This file is part of the GNU MP Library.
6dnl
7dnl  The GNU MP Library is free software; you can redistribute it and/or modify
8dnl  it under the terms of either:
9dnl
10dnl    * the GNU Lesser General Public License as published by the Free
11dnl      Software Foundation; either version 3 of the License, or (at your
12dnl      option) any later version.
13dnl
14dnl  or
15dnl
16dnl    * the GNU General Public License as published by the Free Software
17dnl      Foundation; either version 2 of the License, or (at your option) any
18dnl      later version.
19dnl
20dnl  or both in parallel, as here.
21dnl
22dnl  The GNU MP Library is distributed in the hope that it will be useful, but
23dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
25dnl  for more details.
26dnl
27dnl  You should have received copies of the GNU General Public License and the
28dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,
29dnl  see https://www.gnu.org/licenses/.
30
31
32include(`../config.m4')
33
34C            cycles/limb
35C z900		 0.75
36C z990           0.375
37C z9		 ?
38C z10		 ?
39C z196		 ?
40
41C NOTE
42C  * This is based on GNU libc memcpy which was written by Martin Schwidefsky.
43
44C INPUT PARAMETERS
45define(`rp',	`%r2')
46define(`up',	`%r3')
47define(`n',	`%r4')
48
49ASM_START()
50PROLOGUE(mpn_copyi)
51	ltr	%r4, %r4
52	sll	%r4, 2
53	je	L(rtn)
54	ahi	%r4, -1
55	lr	%r5, %r4
56	srl	%r5, 8
57	ltr	%r5, %r5		C < 256 bytes to copy?
58	je	L(1)
59
60L(top):	mvc	0(256, rp), 0(up)
61	la	rp, 256(rp)
62	la	up, 256(up)
63	brct	%r5, L(top)
64
65L(1):	bras	%r5, L(2)		C make r5 point to mvc insn
66	mvc	0(1, rp), 0(up)
67L(2):	ex	%r4, 0(%r5)		C execute mvc with length ((n-1) mod 256)+1
68L(rtn):	br	%r14
69EPILOGUE()
70