summaryrefslogtreecommitdiff
path: root/libc/string/microblaze/memcpy.S
blob: 7cf081e8783ba9dbe363935a910d42d290d48b36 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*
 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2008 Jim Law - Iris LP  All rights reserved.
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License.  See the file COPYING in the main directory of this
 * archive for more details.
 *
 * Written by Jim Law <jlaw@irispower.com>
 *
 * intended to replace:
 *	memcpy in memcpy.c and
 *	memmove in memmove.c
 * ... in arch/microblaze/lib
 *
 *
 * assly_fastcopy.S
 *
 * Attempt at quicker memcpy and memmove for MicroBlaze
 *	Input :	Operand1 in Reg r5 - destination address
 *		Operand2 in Reg r6 - source address
 *		Operand3 in Reg r7 - number of bytes to transfer
 *	Output: Result in Reg r3 - starting destinaition address
 *
 *
 * Explanation:
 *	Perform (possibly unaligned) copy of a block of memory
 *	between mem locations with size of xfer spec'd in bytes
 */

	.text
	.globl	memcpy
	.type  memcpy, @function
	.ent	memcpy

memcpy:
fast_memcpy_ascending:
	/* move d to return register as value of function */
	addi	r3, r5, 0

	addi	r4, r0, 4	/* n = 4 */
	cmpu	r4, r4, r7	/* n = c - n  (unsigned) */
	blti	r4, a_xfer_end	/* if n < 0, less than one word to transfer */

	/* transfer first 0~3 bytes to get aligned dest address */
	andi	r4, r5, 3		/* n = d & 3 */
	/* if zero, destination already aligned */
	beqi	r4, a_dalign_done
	/* n = 4 - n (yields 3, 2, 1 transfers for 1, 2, 3 addr offset) */
	rsubi	r4, r4, 4
	rsub	r7, r4, r7		/* c = c - n adjust c */

a_xfer_first_loop:
	/* if no bytes left to transfer, transfer the bulk */
	beqi	r4, a_dalign_done
	lbui	r11, r6, 0		/* h = *s */
	sbi	r11, r5, 0		/* *d = h */
	addi	r6, r6, 1		/* s++ */
	addi	r5, r5, 1		/* d++ */
	brid	a_xfer_first_loop	/* loop */
	addi	r4, r4, -1		/* n-- (IN DELAY SLOT) */

a_dalign_done:
	addi	r4, r0, 32		/* n = 32 */
	cmpu	r4, r4, r7		/* n = c - n  (unsigned) */
	/* if n < 0, less than one block to transfer */
	blti	r4, a_block_done

a_block_xfer:
	andi	r9, r6, 3		/* t1 = s & 3 */
	/* if temp == 0, everything is word-aligned */
	beqi	r9, a_word_xfer

a_block_unaligned:
	andi	r4, r7, 0xffffffe0	/* n = c & ~31 */
	rsub	r7, r4, r7		/* c = c - n */
	andi	r8, r6, 0xfffffffc	/* as = s & ~3 */
	add	r6, r6, r4		/* s = s + n */
	lwi	r11, r8, 0		/* h = *(as + 0) */

	addi	r9, r9, -1
	beqi	r9, a_block_u1		/* t1 was 1 => 1 byte offset */
	addi	r9, r9, -1
	beqi	r9, a_block_u2		/* t1 was 2 => 2 byte offset */

a_block_u3:
	bslli	r11, r11, 24	/* h = h << 24 */
a_bu3_loop:
	lwi	r12, r8, 4	/* v = *(as + 4) */
	bsrli	r9, r12, 8	/* t1 = v >> 8 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 0	/* *(d + 0) = t1 */
	bslli	r11, r12, 24	/* h = v << 24 */
	lwi	r12, r8, 8	/* v = *(as + 8) */
	bsrli	r9, r12, 8	/* t1 = v >> 8 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 4	/* *(d + 4) = t1 */
	bslli	r11, r12, 24	/* h = v << 24 */
	lwi	r12, r8, 12	/* v = *(as + 12) */
	bsrli	r9, r12, 8	/* t1 = v >> 8 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 8	/* *(d + 8) = t1 */
	bslli	r11, r12, 24	/* h = v << 24 */
	lwi	r12, r8, 16	/* v = *(as + 16) */
	bsrli	r9, r12, 8	/* t1 = v >> 8 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 12	/* *(d + 12) = t1 */
	bslli	r11, r12, 24	/* h = v << 24 */
	lwi	r12, r8, 20	/* v = *(as + 20) */
	bsrli	r9, r12, 8	/* t1 = v >> 8 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 16	/* *(d + 16) = t1 */
	bslli	r11, r12, 24	/* h = v << 24 */
	lwi	r12, r8, 24	/* v = *(as + 24) */
	bsrli	r9, r12, 8	/* t1 = v >> 8 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 20	/* *(d + 20) = t1 */
	bslli	r11, r12, 24	/* h = v << 24 */
	lwi	r12, r8, 28	/* v = *(as + 28) */
	bsrli	r9, r12, 8	/* t1 = v >> 8 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 24	/* *(d + 24) = t1 */
	bslli	r11, r12, 24	/* h = v << 24 */
	lwi	r12, r8, 32	/* v = *(as + 32) */
	bsrli	r9, r12, 8	/* t1 = v >> 8 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 28	/* *(d + 28) = t1 */
	bslli	r11, r12, 24	/* h = v << 24 */
	addi	r8, r8, 32	/* as = as + 32 */
	addi	r4, r4, -32	/* n = n - 32 */
	bneid	r4, a_bu3_loop	/* while (n) loop */
	addi	r5, r5, 32	/* d = d + 32 (IN DELAY SLOT) */
	bri	a_block_done

a_block_u1:
	bslli	r11, r11, 8	/* h = h << 8 */
a_bu1_loop:
	lwi	r12, r8, 4	/* v = *(as + 4) */
	bsrli	r9, r12, 24	/* t1 = v >> 24 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 0	/* *(d + 0) = t1 */
	bslli	r11, r12, 8	/* h = v << 8 */
	lwi	r12, r8, 8	/* v = *(as + 8) */
	bsrli	r9, r12, 24	/* t1 = v >> 24 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 4	/* *(d + 4) = t1 */
	bslli	r11, r12, 8	/* h = v << 8 */
	lwi	r12, r8, 12	/* v = *(as + 12) */
	bsrli	r9, r12, 24	/* t1 = v >> 24 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 8	/* *(d + 8) = t1 */
	bslli	r11, r12, 8	/* h = v << 8 */
	lwi	r12, r8, 16	/* v = *(as + 16) */
	bsrli	r9, r12, 24	/* t1 = v >> 24 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 12	/* *(d + 12) = t1 */
	bslli	r11, r12, 8	/* h = v << 8 */
	lwi	r12, r8, 20	/* v = *(as + 20) */
	bsrli	r9, r12, 24	/* t1 = v >> 24 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 16	/* *(d + 16) = t1 */
	bslli	r11, r12, 8	/* h = v << 8 */
	lwi	r12, r8, 24	/* v = *(as + 24) */
	bsrli	r9, r12, 24	/* t1 = v >> 24 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 20	/* *(d + 20) = t1 */
	bslli	r11, r12, 8	/* h = v << 8 */
	lwi	r12, r8, 28	/* v = *(as + 28) */
	bsrli	r9, r12, 24	/* t1 = v >> 24 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 24	/* *(d + 24) = t1 */
	bslli	r11, r12, 8	/* h = v << 8 */
	lwi	r12, r8, 32	/* v = *(as + 32) */
	bsrli	r9, r12, 24	/* t1 = v >> 24 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 28	/* *(d + 28) = t1 */
	bslli	r11, r12, 8	/* h = v << 8 */
	addi	r8, r8, 32	/* as = as + 32 */
	addi	r4, r4, -32	/* n = n - 32 */
	bneid	r4, a_bu1_loop	/* while (n) loop */
	addi	r5, r5, 32	/* d = d + 32 (IN DELAY SLOT) */
	bri	a_block_done

a_block_u2:
	bslli	r11, r11, 16	/* h = h << 16 */
a_bu2_loop:
	lwi	r12, r8, 4	/* v = *(as + 4) */
	bsrli	r9, r12, 16	/* t1 = v >> 16 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 0	/* *(d + 0) = t1 */
	bslli	r11, r12, 16	/* h = v << 16 */
	lwi	r12, r8, 8	/* v = *(as + 8) */
	bsrli	r9, r12, 16	/* t1 = v >> 16 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 4	/* *(d + 4) = t1 */
	bslli	r11, r12, 16	/* h = v << 16 */
	lwi	r12, r8, 12	/* v = *(as + 12) */
	bsrli	r9, r12, 16	/* t1 = v >> 16 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 8	/* *(d + 8) = t1 */
	bslli	r11, r12, 16	/* h = v << 16 */
	lwi	r12, r8, 16	/* v = *(as + 16) */
	bsrli	r9, r12, 16	/* t1 = v >> 16 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 12	/* *(d + 12) = t1 */
	bslli	r11, r12, 16	/* h = v << 16 */
	lwi	r12, r8, 20	/* v = *(as + 20) */
	bsrli	r9, r12, 16	/* t1 = v >> 16 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 16	/* *(d + 16) = t1 */
	bslli	r11, r12, 16	/* h = v << 16 */
	lwi	r12, r8, 24	/* v = *(as + 24) */
	bsrli	r9, r12, 16	/* t1 = v >> 16 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 20	/* *(d + 20) = t1 */
	bslli	r11, r12, 16	/* h = v << 16 */
	lwi	r12, r8, 28	/* v = *(as + 28) */
	bsrli	r9, r12, 16	/* t1 = v >> 16 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 24	/* *(d + 24) = t1 */
	bslli	r11, r12, 16	/* h = v << 16 */
	lwi	r12, r8, 32	/* v = *(as + 32) */
	bsrli	r9, r12, 16	/* t1 = v >> 16 */
	or	r9, r11, r9	/* t1 = h | t1 */
	swi	r9, r5, 28	/* *(d + 28) = t1 */
	bslli	r11, r12, 16	/* h = v << 16 */
	addi	r8, r8, 32	/* as = as + 32 */
	addi	r4, r4, -32	/* n = n - 32 */
	bneid	r4, a_bu2_loop	/* while (n) loop */
	addi	r5, r5, 32	/* d = d + 32 (IN DELAY SLOT) */

a_block_done:
	addi	r4, r0, 4	/* n = 4 */
	cmpu	r4, r4, r7	/* n = c - n  (unsigned) */
	blti	r4, a_xfer_end	/* if n < 0, less than one word to transfer */

a_word_xfer:
	andi	r4, r7, 0xfffffffc	/* n = c & ~3 */
	addi	r10, r0, 0		/* offset = 0 */

	andi	r9, r6, 3		/* t1 = s & 3 */
	/* if temp != 0, unaligned transfers needed */
	bnei	r9, a_word_unaligned

a_word_aligned:
	lw	r9, r6, r10		/* t1 = *(s+offset) */
	sw	r9, r5, r10		/* *(d+offset) = t1 */
	addi	r4, r4,-4		/* n-- */
	bneid	r4, a_word_aligned	/* loop */
	addi	r10, r10, 4		/* offset++ (IN DELAY SLOT) */

	bri	a_word_done

a_word_unaligned:
	andi	r8, r6, 0xfffffffc	/* as = s & ~3 */
	lwi	r11, r8, 0		/* h = *(as + 0) */
	addi	r8, r8, 4		/* as = as + 4 */

	addi	r9, r9, -1
	beqi	r9, a_word_u1		/* t1 was 1 => 1 byte offset */
	addi	r9, r9, -1
	beqi	r9, a_word_u2		/* t1 was 2 => 2 byte offset */

a_word_u3:
	bslli	r11, r11, 24	/* h = h << 24 */
a_wu3_loop:
	lw	r12, r8, r10	/* v = *(as + offset) */
	bsrli	r9, r12, 8	/* t1 = v >> 8 */
	or	r9, r11, r9	/* t1 = h | t1 */
	sw	r9, r5, r10	/* *(d + offset) = t1 */
	bslli	r11, r12, 24	/* h = v << 24 */
	addi	r4, r4,-4	/* n = n - 4 */
	bneid	r4, a_wu3_loop	/* while (n) loop */
	addi	r10, r10, 4	/* offset = ofset + 4 (IN DELAY SLOT) */

	bri	a_word_done

a_word_u1:
	bslli	r11, r11, 8	/* h = h << 8 */
a_wu1_loop:
	lw	r12, r8, r10	/* v = *(as + offset) */
	bsrli	r9, r12, 24	/* t1 = v >> 24 */
	or	r9, r11, r9	/* t1 = h | t1 */
	sw	r9, r5, r10	/* *(d + offset) = t1 */
	bslli	r11, r12, 8	/* h = v << 8 */
	addi	r4, r4,-4	/* n = n - 4 */
	bneid	r4, a_wu1_loop	/* while (n) loop */
	addi	r10, r10, 4	/* offset = ofset + 4 (IN DELAY SLOT) */

	bri	a_word_done

a_word_u2:
	bslli	r11, r11, 16	/* h = h << 16 */
a_wu2_loop:
	lw	r12, r8, r10	/* v = *(as + offset) */
	bsrli	r9, r12, 16	/* t1 = v >> 16 */
	or	r9, r11, r9	/* t1 = h | t1 */
	sw	r9, r5, r10	/* *(d + offset) = t1 */
	bslli	r11, r12, 16	/* h = v << 16 */
	addi	r4, r4,-4	/* n = n - 4 */
	bneid	r4, a_wu2_loop	/* while (n) loop */
	addi	r10, r10, 4	/* offset = ofset + 4 (IN DELAY SLOT) */

a_word_done:
	add	r5, r5, r10	/* d = d + offset */
	add	r6, r6, r10	/* s = s + offset */
	rsub	r7, r10, r7	/* c = c - offset */

a_xfer_end:
a_xfer_end_loop:
	beqi	r7, a_done		/* while (c) */
	lbui	r9, r6, 0		/* t1 = *s */
	addi	r6, r6, 1		/* s++ */
	sbi	r9, r5, 0		/* *d = t1 */
	addi	r7, r7, -1		/* c-- */
	brid	a_xfer_end_loop		/* loop */
	addi	r5, r5, 1		/* d++ (IN DELAY SLOT) */

a_done:
	rtsd	r15, 8
	nop

.size  memcpy, . - memcpy
.end memcpy
libc_hidden_def(memcpy)