1dnl  ARM mpn_copyd.
2
3dnl  Copyright 2003 Free Software Foundation, Inc.
4
5dnl  This file is part of the GNU MP Library.
6
7dnl  The GNU MP Library is free software; you can redistribute it and/or modify
8dnl  it under the terms of the GNU Lesser General Public License as published
9dnl  by the Free Software Foundation; either version 3 of the License, or (at
10dnl  your option) any later version.
11
12dnl  The GNU MP Library is distributed in the hope that it will be useful, but
13dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15dnl  License for more details.
16
17dnl  You should have received a copy of the GNU Lesser General Public License
18dnl  along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.
19
20include(`../config.m4')
21
22C This runs at 3 cycles/limb in the StrongARM.
23
24define(`rp',`r0')
25define(`up',`r1')
26define(`n',`r2')
27
28
29ASM_START()
30PROLOGUE(mpn_copyd)
31	mov	r12, n, lsl #2
32	sub	r12, r12, #4
33	add	rp, rp, r12			C make rp point at last limb
34	add	up, up, r12			C make up point at last limb
35
36	tst	n, #1
37	beq	L(skip1)
38	ldr	r3, [up], #-4
39	str	r3, [rp], #-4
40L(skip1):
41	tst	n, #2
42	beq	L(skip2)
43	ldmda	up!, { r3, r12 }		C load 2 limbs
44	stmda	rp!, { r3, r12 }		C store 2 limbs
45L(skip2):
46	bics	n, n, #3
47	beq	L(return)
48	stmfd	sp!, { r7, r8, r9 }		C save regs on stack
49L(loop):
50	ldmda	up!, { r3, r8, r9, r12 }	C load 4 limbs
51	ldr	r7, [rp, #-12]			C cache allocate
52	subs	n, n, #4
53	stmda	rp!, { r3, r8, r9, r12 }	C store 4 limbs
54	bne	L(loop)
55	ldmfd	sp!, { r7, r8, r9 }		C restore regs from stack
56L(return):
57	mov	pc, lr
58EPILOGUE(mpn_copyd)
59