summaryrefslogtreecommitdiff
path: root/sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
blob: ac9d470b76938781ee276289c2ba982c8fe1083f (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
/* Copy SIZE bytes from SRC to DEST.
   For UltraSPARC-III.
   Copyright (C) 2001-2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by David S. Miller (davem@redhat.com)

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>

#define ASI_BLK_P 0xf0
#define FPRS_FEF  0x04
#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs

#ifndef XCC
#define USE_BPR
#define XCC xcc
#endif

#if !defined NOT_IN_libc

	.register	%g2,#scratch
	.register	%g3,#scratch
	.register	%g6,#scratch

	.text

ENTRY(__mempcpy_ultra3)
	ba,pt		%XCC, 101f
	 add		%o0, %o2, %g5
END(__mempcpy_ultra3)

	/* Special/non-trivial issues of this code:
	 *
	 * 1) %o5 is preserved from VISEntryHalf to VISExitHalf
	 * 2) Only low 32 FPU registers are used so that only the
	 *    lower half of the FPU register set is dirtied by this
	 *    code.  This is especially important in the kernel.
	 * 3) This code never prefetches cachelines past the end
	 *    of the source buffer.
	 *
	 * The cheetah's flexible spine, oversized liver, enlarged heart,
	 * slender muscular body, and claws make it the swiftest hunter
	 * in Africa and the fastest animal on land.  Can reach speeds
	 * of up to 2.4GB per second.
	 */
	.align		32
ENTRY(__memcpy_ultra3)

100: /* %o0=dst, %o1=src, %o2=len */
	mov		%o0, %g5
101:
	cmp		%o2, 0
	be,pn		%XCC, out
218:	 or		%o0, %o1, %o3
	cmp		%o2, 16
	bleu,a,pn	%XCC, small_copy
	 or		%o3, %o2, %o3

	cmp		%o2, 256
	blu,pt		%XCC, medium_copy
	 andcc		%o3, 0x7, %g0

	ba,pt		%xcc, enter
	 andcc		%o0, 0x3f, %g2

	/* Here len >= 256 and condition codes reflect execution
	 * of "andcc %o0, 0x7, %g2", done by caller.
	 */
	.align		64
enter:
	/* Is 'dst' already aligned on an 64-byte boundary? */
	be,pt		%XCC, 2f

	/* Compute abs((dst & 0x3f) - 0x40) into %g2.  This is the number
	 * of bytes to copy to make 'dst' 64-byte aligned.  We pre-
	 * subtract this from 'len'.
	 */
	 sub		%g2, 0x40, %g2
	sub		%g0, %g2, %g2
	sub		%o2, %g2, %o2

	/* Copy %g2 bytes from src to dst, one byte at a time. */
1:	ldub		[%o1 + 0x00], %o3
	add		%o1, 0x1, %o1
	add		%o0, 0x1, %o0
	subcc		%g2, 0x1, %g2

	bg,pt		%XCC, 1b
	 stb		%o3, [%o0 + -1]

2:	VISEntryHalf
	and		%o1, 0x7, %g1
	ba,pt		%xcc, begin
	 alignaddr	%o1, %g0, %o1

	.align		64
begin:
	prefetch	[%o1 + 0x000], #one_read
	prefetch	[%o1 + 0x040], #one_read
	andn		%o2, (0x40 - 1), %o4
	prefetch	[%o1 + 0x080], #one_read
	prefetch	[%o1 + 0x0c0], #one_read
	ldd		[%o1 + 0x000], %f0
	prefetch	[%o1 + 0x100], #one_read
	ldd		[%o1 + 0x008], %f2
	prefetch	[%o1 + 0x140], #one_read
	ldd		[%o1 + 0x010], %f4
	prefetch	[%o1 + 0x180], #one_read
	faligndata	%f0, %f2, %f16
	ldd		[%o1 + 0x018], %f6
	faligndata	%f2, %f4, %f18
	ldd		[%o1 + 0x020], %f8
	faligndata	%f4, %f6, %f20
	ldd		[%o1 + 0x028], %f10
	faligndata	%f6, %f8, %f22

	ldd		[%o1 + 0x030], %f12
	faligndata	%f8, %f10, %f24
	ldd		[%o1 + 0x038], %f14
	faligndata	%f10, %f12, %f26
	ldd		[%o1 + 0x040], %f0

	sub		%o4, 0x80, %o4
	add		%o1, 0x40, %o1
	ba,pt		%xcc, loop
	 srl		%o4, 6, %o3

	.align		64
loop:
	ldd		[%o1 + 0x008], %f2
	faligndata	%f12, %f14, %f28
	ldd		[%o1 + 0x010], %f4
	faligndata	%f14, %f0, %f30
	stda		%f16, [%o0] ASI_BLK_P
	ldd		[%o1 + 0x018], %f6
	faligndata	%f0, %f2, %f16

	ldd		[%o1 + 0x020], %f8
	faligndata	%f2, %f4, %f18
	ldd		[%o1 + 0x028], %f10
	faligndata	%f4, %f6, %f20
	ldd		[%o1 + 0x030], %f12
	faligndata	%f6, %f8, %f22
	ldd		[%o1 + 0x038], %f14
	faligndata	%f8, %f10, %f24

	ldd		[%o1 + 0x040], %f0
	prefetch	[%o1 + 0x180], #one_read
	faligndata	%f10, %f12, %f26
	subcc		%o3, 0x01, %o3
	add		%o1, 0x40, %o1
	bg,pt		%XCC, loop
	 add		%o0, 0x40, %o0

	/* Finally we copy the last full 64-byte block. */
loopfini:
	ldd		[%o1 + 0x008], %f2
	faligndata	%f12, %f14, %f28
	ldd		[%o1 + 0x010], %f4
	faligndata	%f14, %f0, %f30
	stda		%f16, [%o0] ASI_BLK_P
	ldd		[%o1 + 0x018], %f6
	faligndata	%f0, %f2, %f16
	ldd		[%o1 + 0x020], %f8
	faligndata	%f2, %f4, %f18
	ldd		[%o1 + 0x028], %f10
	faligndata	%f4, %f6, %f20
	ldd		[%o1 + 0x030], %f12
	faligndata	%f6, %f8, %f22
	ldd		[%o1 + 0x038], %f14
	faligndata	%f8, %f10, %f24
	cmp		%g1, 0
	be,pt		%XCC, 1f
	 add		%o0, 0x40, %o0
	ldd		[%o1 + 0x040], %f0
1:	faligndata	%f10, %f12, %f26
	faligndata	%f12, %f14, %f28
	faligndata	%f14, %f0, %f30
	stda		%f16, [%o0] ASI_BLK_P
	add		%o0, 0x40, %o0
	add		%o1, 0x40, %o1
	membar		#Sync

	/* Now we copy the (len modulo 64) bytes at the end.
	 * Note how we borrow the %f0 loaded above.
	 *
	 * Also notice how this code is careful not to perform a
	 * load past the end of the src buffer.
	 */
loopend:
	and		%o2, 0x3f, %o2
	andcc		%o2, 0x38, %g2
	be,pn		%XCC, endcruft
	 subcc		%g2, 0x8, %g2
	be,pn		%XCC, endcruft
	 cmp		%g1, 0

	be,a,pt		%XCC, 1f
	 ldd		[%o1 + 0x00], %f0

1:	ldd		[%o1 + 0x08], %f2
	add		%o1, 0x8, %o1
	sub		%o2, 0x8, %o2
	subcc		%g2, 0x8, %g2
	faligndata	%f0, %f2, %f8
	std		%f8, [%o0 + 0x00]
	be,pn		%XCC, endcruft
	 add		%o0, 0x8, %o0
	ldd		[%o1 + 0x08], %f0
	add		%o1, 0x8, %o1
	sub		%o2, 0x8, %o2
	subcc		%g2, 0x8, %g2
	faligndata	%f2, %f0, %f8
	std		%f8, [%o0 + 0x00]
	bne,pn		%XCC, 1b
	 add		%o0, 0x8, %o0

	/* If anything is left, we copy it one byte at a time.
	 * Note that %g1 is (src & 0x3) saved above before the
	 * alignaddr was performed.
	 */
endcruft:
	cmp		%o2, 0
	add		%o1, %g1, %o1
	VISExitHalf
	be,pn		%XCC, out
	 sub		%o0, %o1, %o3

	andcc		%g1, 0x7, %g0
	bne,pn		%icc, small_copy_unaligned
	 andcc		%o2, 0x8, %g0
	be,pt		%icc, 1f
	 nop
	ldx		[%o1], %o5
	stx		%o5, [%o1 + %o3]
	add		%o1, 0x8, %o1

1:	andcc		%o2, 0x4, %g0
	be,pt		%icc, 1f
	 nop
	lduw		[%o1], %o5
	stw		%o5, [%o1 + %o3]
	add		%o1, 0x4, %o1

1:	andcc		%o2, 0x2, %g0
	be,pt		%icc, 1f
	 nop
	lduh		[%o1], %o5
	sth		%o5, [%o1 + %o3]
	add		%o1, 0x2, %o1

1:	andcc		%o2, 0x1, %g0
	be,pt		%icc, out
	 nop
	ldub		[%o1], %o5
	ba,pt		%xcc, out
	 stb		%o5, [%o1 + %o3]

medium_copy: /* 16 < len <= 64 */
	bne,pn		%XCC, small_copy_unaligned
	 sub		%o0, %o1, %o3

medium_copy_aligned:
	andn		%o2, 0x7, %o4
	and		%o2, 0x7, %o2
1:	subcc		%o4, 0x8, %o4
	ldx		[%o1], %o5
	stx		%o5, [%o1 + %o3]
	bgu,pt		%XCC, 1b
	 add		%o1, 0x8, %o1
	andcc		%o2, 0x4, %g0
	be,pt		%XCC, 1f
	 nop
	sub		%o2, 0x4, %o2
	lduw		[%o1], %o5
	stw		%o5, [%o1 + %o3]
	add		%o1, 0x4, %o1
1:	cmp		%o2, 0
	be,pt		%XCC, out
	 nop
	ba,pt		%xcc, small_copy_unaligned
	 nop

small_copy: /* 0 < len <= 16 */
	andcc		%o3, 0x3, %g0
	bne,pn		%XCC, small_copy_unaligned
	 sub		%o0, %o1, %o3

small_copy_aligned:
	subcc		%o2, 4, %o2
	lduw		[%o1], %g1
	stw		%g1, [%o1 + %o3]
	bgu,pt		%XCC, small_copy_aligned
	 add		%o1, 4, %o1

out:	retl
	 mov		%g5, %o0

	.align	32
small_copy_unaligned:
	subcc		%o2, 1, %o2
	ldub		[%o1], %g1
	stb		%g1, [%o1 + %o3]
	bgu,pt		%XCC, small_copy_unaligned
	 add		%o1, 1, %o1
	retl
	 mov		%g5, %o0

END(__memcpy_ultra3)

#endif