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review.evervolv.com / android_kernel_oneplus_msm8996 / 79d30a581fc405fc63322622cb1517d95ed8f5ce / . / arch / sparc / lib / U3memcpy.S
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Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/* U3memcpy.S: UltraSparc-III optimized memcpy.
2 *
3 * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
4 */
5
6#ifdef __KERNEL__
7#include <asm/visasm.h>
8#include <asm/asi.h>
9#define GLOBAL_SPARE %g7
10#else
11#define ASI_BLK_P 0xf0
12#define FPRS_FEF 0x04
13#ifdef MEMCPY_DEBUG
14#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs; \
15 clr %g1; clr %g2; clr %g3; subcc %g0, %g0, %g0;
16#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
17#else
18#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
19#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
20#endif
21#define GLOBAL_SPARE %g5
22#endif
23
24#ifndef EX_LD
25#define EX_LD(x) x
26#endif
27
28#ifndef EX_ST
29#define EX_ST(x) x
30#endif
31
32#ifndef EX_RETVAL
33#define EX_RETVAL(x) x
34#endif
35
36#ifndef LOAD
37#define LOAD(type,addr,dest) type [addr], dest
38#endif
39
40#ifndef STORE
41#define STORE(type,src,addr) type src, [addr]
42#endif
43
44#ifndef STORE_BLK
45#define STORE_BLK(src,addr) stda src, [addr] ASI_BLK_P
46#endif
47
48#ifndef FUNC_NAME
49#define FUNC_NAME U3memcpy
50#endif
51
52#ifndef PREAMBLE
53#define PREAMBLE
54#endif
55
56#ifndef XCC
57#define XCC xcc
58#endif
59
60 .register %g2,#scratch
61 .register %g3,#scratch
62
63 /* Special/non-trivial issues of this code:
64 *
65 * 1) %o5 is preserved from VISEntryHalf to VISExitHalf
66 * 2) Only low 32 FPU registers are used so that only the
67 * lower half of the FPU register set is dirtied by this
68 * code. This is especially important in the kernel.
69 * 3) This code never prefetches cachelines past the end
70 * of the source buffer.
71 */
72
73 .text
74 .align 64
75
76 /* The cheetah's flexible spine, oversized liver, enlarged heart,
77 * slender muscular body, and claws make it the swiftest hunter
78 * in Africa and the fastest animal on land. Can reach speeds
79 * of up to 2.4GB per second.
80 */
81
82 .globl FUNC_NAME
83 .type FUNC_NAME,#function
84FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
85 srlx %o2, 31, %g2
86 cmp %g2, 0
87 tne %xcc, 5
88 PREAMBLE
89 mov %o0, %o4
90 cmp %o2, 0
91 be,pn %XCC, 85f
92 or %o0, %o1, %o3
93 cmp %o2, 16
94 blu,a,pn %XCC, 80f
95 or %o3, %o2, %o3
96
97 cmp %o2, (3 * 64)
98 blu,pt %XCC, 70f
99 andcc %o3, 0x7, %g0
100
101 /* Clobbers o5/g1/g2/g3/g7/icc/xcc. We must preserve
102 * o5 from here until we hit VISExitHalf.
103 */
104 VISEntryHalf
105
106 /* Is 'dst' already aligned on an 64-byte boundary? */
107 andcc %o0, 0x3f, %g2
108 be,pt %XCC, 2f
109
110 /* Compute abs((dst & 0x3f) - 0x40) into %g2. This is the number
111 * of bytes to copy to make 'dst' 64-byte aligned. We pre-
112 * subtract this from 'len'.
113 */
114 sub %o0, %o1, GLOBAL_SPARE
115 sub %g2, 0x40, %g2
116 sub %g0, %g2, %g2
117 sub %o2, %g2, %o2
118 andcc %g2, 0x7, %g1
119 be,pt %icc, 2f
120 and %g2, 0x38, %g2
121
1221: subcc %g1, 0x1, %g1
123 EX_LD(LOAD(ldub, %o1 + 0x00, %o3))
124 EX_ST(STORE(stb, %o3, %o1 + GLOBAL_SPARE))
125 bgu,pt %XCC, 1b
126 add %o1, 0x1, %o1
127
128 add %o1, GLOBAL_SPARE, %o0
129
1302: cmp %g2, 0x0
131 and %o1, 0x7, %g1
132 be,pt %icc, 3f
133 alignaddr %o1, %g0, %o1
134
135 EX_LD(LOAD(ldd, %o1, %f4))
1361: EX_LD(LOAD(ldd, %o1 + 0x8, %f6))
137 add %o1, 0x8, %o1
138 subcc %g2, 0x8, %g2
139 faligndata %f4, %f6, %f0
140 EX_ST(STORE(std, %f0, %o0))
141 be,pn %icc, 3f
142 add %o0, 0x8, %o0
143
144 EX_LD(LOAD(ldd, %o1 + 0x8, %f4))
145 add %o1, 0x8, %o1
146 subcc %g2, 0x8, %g2
147 faligndata %f6, %f4, %f2
148 EX_ST(STORE(std, %f2, %o0))
149 bne,pt %icc, 1b
150 add %o0, 0x8, %o0
151
1523: LOAD(prefetch, %o1 + 0x000, #one_read)
153 LOAD(prefetch, %o1 + 0x040, #one_read)
154 andn %o2, (0x40 - 1), GLOBAL_SPARE
155 LOAD(prefetch, %o1 + 0x080, #one_read)
156 LOAD(prefetch, %o1 + 0x0c0, #one_read)
157 LOAD(prefetch, %o1 + 0x100, #one_read)
158 EX_LD(LOAD(ldd, %o1 + 0x000, %f0))
159 LOAD(prefetch, %o1 + 0x140, #one_read)
160 EX_LD(LOAD(ldd, %o1 + 0x008, %f2))
161 LOAD(prefetch, %o1 + 0x180, #one_read)
162 EX_LD(LOAD(ldd, %o1 + 0x010, %f4))
163 LOAD(prefetch, %o1 + 0x1c0, #one_read)
164 faligndata %f0, %f2, %f16
165 EX_LD(LOAD(ldd, %o1 + 0x018, %f6))
166 faligndata %f2, %f4, %f18
167 EX_LD(LOAD(ldd, %o1 + 0x020, %f8))
168 faligndata %f4, %f6, %f20
169 EX_LD(LOAD(ldd, %o1 + 0x028, %f10))
170 faligndata %f6, %f8, %f22
171
172 EX_LD(LOAD(ldd, %o1 + 0x030, %f12))
173 faligndata %f8, %f10, %f24
174 EX_LD(LOAD(ldd, %o1 + 0x038, %f14))
175 faligndata %f10, %f12, %f26
176 EX_LD(LOAD(ldd, %o1 + 0x040, %f0))
177
178 subcc GLOBAL_SPARE, 0x80, GLOBAL_SPARE
179 add %o1, 0x40, %o1
180 bgu,pt %XCC, 1f
181 srl GLOBAL_SPARE, 6, %o3
182 ba,pt %xcc, 2f
183 nop
184
185 .align 64
1861:
187 EX_LD(LOAD(ldd, %o1 + 0x008, %f2))
188 faligndata %f12, %f14, %f28
189 EX_LD(LOAD(ldd, %o1 + 0x010, %f4))
190 faligndata %f14, %f0, %f30
191 EX_ST(STORE_BLK(%f16, %o0))
192 EX_LD(LOAD(ldd, %o1 + 0x018, %f6))
193 faligndata %f0, %f2, %f16
194 add %o0, 0x40, %o0
195
196 EX_LD(LOAD(ldd, %o1 + 0x020, %f8))
197 faligndata %f2, %f4, %f18
198 EX_LD(LOAD(ldd, %o1 + 0x028, %f10))
199 faligndata %f4, %f6, %f20
200 EX_LD(LOAD(ldd, %o1 + 0x030, %f12))
201 subcc %o3, 0x01, %o3
202 faligndata %f6, %f8, %f22
203 EX_LD(LOAD(ldd, %o1 + 0x038, %f14))
204
205 faligndata %f8, %f10, %f24
206 EX_LD(LOAD(ldd, %o1 + 0x040, %f0))
207 LOAD(prefetch, %o1 + 0x1c0, #one_read)
208 faligndata %f10, %f12, %f26
209 bg,pt %XCC, 1b
210 add %o1, 0x40, %o1
211
212 /* Finally we copy the last full 64-byte block. */
2132:
214 EX_LD(LOAD(ldd, %o1 + 0x008, %f2))
215 faligndata %f12, %f14, %f28
216 EX_LD(LOAD(ldd, %o1 + 0x010, %f4))
217 faligndata %f14, %f0, %f30
218 EX_ST(STORE_BLK(%f16, %o0))
219 EX_LD(LOAD(ldd, %o1 + 0x018, %f6))
220 faligndata %f0, %f2, %f16
221 EX_LD(LOAD(ldd, %o1 + 0x020, %f8))
222 faligndata %f2, %f4, %f18
223 EX_LD(LOAD(ldd, %o1 + 0x028, %f10))
224 faligndata %f4, %f6, %f20
225 EX_LD(LOAD(ldd, %o1 + 0x030, %f12))
226 faligndata %f6, %f8, %f22
227 EX_LD(LOAD(ldd, %o1 + 0x038, %f14))
228 faligndata %f8, %f10, %f24
229 cmp %g1, 0
230 be,pt %XCC, 1f
231 add %o0, 0x40, %o0
232 EX_LD(LOAD(ldd, %o1 + 0x040, %f0))
2331: faligndata %f10, %f12, %f26
234 faligndata %f12, %f14, %f28
235 faligndata %f14, %f0, %f30
236 EX_ST(STORE_BLK(%f16, %o0))
237 add %o0, 0x40, %o0
238 add %o1, 0x40, %o1
239 membar #Sync
240
241 /* Now we copy the (len modulo 64) bytes at the end.
242 * Note how we borrow the %f0 loaded above.
243 *
244 * Also notice how this code is careful not to perform a
245 * load past the end of the src buffer.
246 */
247 and %o2, 0x3f, %o2
248 andcc %o2, 0x38, %g2
249 be,pn %XCC, 2f
250 subcc %g2, 0x8, %g2
251 be,pn %XCC, 2f
252 cmp %g1, 0
253
254 sub %o2, %g2, %o2
255 be,a,pt %XCC, 1f
256 EX_LD(LOAD(ldd, %o1 + 0x00, %f0))
257
2581: EX_LD(LOAD(ldd, %o1 + 0x08, %f2))
259 add %o1, 0x8, %o1
260 subcc %g2, 0x8, %g2
261 faligndata %f0, %f2, %f8
262 EX_ST(STORE(std, %f8, %o0))
263 be,pn %XCC, 2f
264 add %o0, 0x8, %o0
265 EX_LD(LOAD(ldd, %o1 + 0x08, %f0))
266 add %o1, 0x8, %o1
267 subcc %g2, 0x8, %g2
268 faligndata %f2, %f0, %f8
269 EX_ST(STORE(std, %f8, %o0))
270 bne,pn %XCC, 1b
271 add %o0, 0x8, %o0
272
273 /* If anything is left, we copy it one byte at a time.
274 * Note that %g1 is (src & 0x3) saved above before the
275 * alignaddr was performed.
276 */
2772:
278 cmp %o2, 0
279 add %o1, %g1, %o1
280 VISExitHalf
281 be,pn %XCC, 85f
282 sub %o0, %o1, %o3
283
284 andcc %g1, 0x7, %g0
285 bne,pn %icc, 90f
286 andcc %o2, 0x8, %g0
287 be,pt %icc, 1f
288 nop
289 EX_LD(LOAD(ldx, %o1, %o5))
290 EX_ST(STORE(stx, %o5, %o1 + %o3))
291 add %o1, 0x8, %o1
292
2931: andcc %o2, 0x4, %g0
294 be,pt %icc, 1f
295 nop
296 EX_LD(LOAD(lduw, %o1, %o5))
297 EX_ST(STORE(stw, %o5, %o1 + %o3))
298 add %o1, 0x4, %o1
299
3001: andcc %o2, 0x2, %g0
301 be,pt %icc, 1f
302 nop
303 EX_LD(LOAD(lduh, %o1, %o5))
304 EX_ST(STORE(sth, %o5, %o1 + %o3))
305 add %o1, 0x2, %o1
306
3071: andcc %o2, 0x1, %g0
308 be,pt %icc, 85f
309 nop
310 EX_LD(LOAD(ldub, %o1, %o5))
311 ba,pt %xcc, 85f
312 EX_ST(STORE(stb, %o5, %o1 + %o3))
313
314 .align 64
31570: /* 16 < len <= 64 */
316 bne,pn %XCC, 75f
317 sub %o0, %o1, %o3
318
31972:
320 andn %o2, 0xf, GLOBAL_SPARE
321 and %o2, 0xf, %o2
3221: subcc GLOBAL_SPARE, 0x10, GLOBAL_SPARE
323 EX_LD(LOAD(ldx, %o1 + 0x00, %o5))
324 EX_LD(LOAD(ldx, %o1 + 0x08, %g1))
325 EX_ST(STORE(stx, %o5, %o1 + %o3))
326 add %o1, 0x8, %o1
327 EX_ST(STORE(stx, %g1, %o1 + %o3))
328 bgu,pt %XCC, 1b
329 add %o1, 0x8, %o1
33073: andcc %o2, 0x8, %g0
331 be,pt %XCC, 1f
332 nop
333 sub %o2, 0x8, %o2
334 EX_LD(LOAD(ldx, %o1, %o5))
335 EX_ST(STORE(stx, %o5, %o1 + %o3))
336 add %o1, 0x8, %o1
3371: andcc %o2, 0x4, %g0
338 be,pt %XCC, 1f
339 nop
340 sub %o2, 0x4, %o2
341 EX_LD(LOAD(lduw, %o1, %o5))
342 EX_ST(STORE(stw, %o5, %o1 + %o3))
343 add %o1, 0x4, %o1
3441: cmp %o2, 0
345 be,pt %XCC, 85f
346 nop
347 ba,pt %xcc, 90f
348 nop
349
35075:
351 andcc %o0, 0x7, %g1
352 sub %g1, 0x8, %g1
353 be,pn %icc, 2f
354 sub %g0, %g1, %g1
355 sub %o2, %g1, %o2
356
3571: subcc %g1, 1, %g1
358 EX_LD(LOAD(ldub, %o1, %o5))
359 EX_ST(STORE(stb, %o5, %o1 + %o3))
360 bgu,pt %icc, 1b
361 add %o1, 1, %o1
362
3632: add %o1, %o3, %o0
364 andcc %o1, 0x7, %g1
365 bne,pt %icc, 8f
366 sll %g1, 3, %g1
367
368 cmp %o2, 16
369 bgeu,pt %icc, 72b
370 nop
371 ba,a,pt %xcc, 73b
372
3738: mov 64, %o3
374 andn %o1, 0x7, %o1
375 EX_LD(LOAD(ldx, %o1, %g2))
376 sub %o3, %g1, %o3
377 andn %o2, 0x7, GLOBAL_SPARE
378 sllx %g2, %g1, %g2
3791: EX_LD(LOAD(ldx, %o1 + 0x8, %g3))
380 subcc GLOBAL_SPARE, 0x8, GLOBAL_SPARE
381 add %o1, 0x8, %o1
382 srlx %g3, %o3, %o5
383 or %o5, %g2, %o5
384 EX_ST(STORE(stx, %o5, %o0))
385 add %o0, 0x8, %o0
386 bgu,pt %icc, 1b
387 sllx %g3, %g1, %g2
388
389 srl %g1, 3, %g1
390 andcc %o2, 0x7, %o2
391 be,pn %icc, 85f
392 add %o1, %g1, %o1
393 ba,pt %xcc, 90f
394 sub %o0, %o1, %o3
395
396 .align 64
39780: /* 0 < len <= 16 */
398 andcc %o3, 0x3, %g0
399 bne,pn %XCC, 90f
400 sub %o0, %o1, %o3
401
4021:
403 subcc %o2, 4, %o2
404 EX_LD(LOAD(lduw, %o1, %g1))
405 EX_ST(STORE(stw, %g1, %o1 + %o3))
406 bgu,pt %XCC, 1b
407 add %o1, 4, %o1
408
40985: retl
410 mov EX_RETVAL(%o4), %o0
411
412 .align 32
41390:
414 subcc %o2, 1, %o2
415 EX_LD(LOAD(ldub, %o1, %g1))
416 EX_ST(STORE(stb, %g1, %o1 + %o3))
417 bgu,pt %XCC, 90b
418 add %o1, 1, %o1
419 retl
420 mov EX_RETVAL(%o4), %o0
421
422 .size FUNC_NAME, .-FUNC_NAME