xref: /linux/arch/sparc/lib/U3memcpy.S (revision c0c914eca7f251c70facc37dfebeaf176601918d) 
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#ifndef EX_LD_FP
28#define EX_LD_FP(x)	x
29#endif
30
31#ifndef EX_ST
32#define EX_ST(x)	x
33#endif
34#ifndef EX_ST_FP
35#define EX_ST_FP(x)	x
36#endif
37
38#ifndef EX_RETVAL
39#define EX_RETVAL(x)	x
40#endif
41
42#ifndef LOAD
43#define LOAD(type,addr,dest)	type [addr], dest
44#endif
45
46#ifndef STORE
47#define STORE(type,src,addr)	type src, [addr]
48#endif
49
50#ifndef STORE_BLK
51#define STORE_BLK(src,addr)	stda src, [addr] ASI_BLK_P
52#endif
53
54#ifndef FUNC_NAME
55#define FUNC_NAME	U3memcpy
56#endif
57
58#ifndef PREAMBLE
59#define PREAMBLE
60#endif
61
62#ifndef XCC
63#define XCC xcc
64#endif
65
66	.register	%g2,#scratch
67	.register	%g3,#scratch
68
69	/* Special/non-trivial issues of this code:
70	 *
71	 * 1) %o5 is preserved from VISEntryHalf to VISExitHalf
72	 * 2) Only low 32 FPU registers are used so that only the
73	 *    lower half of the FPU register set is dirtied by this
74	 *    code.  This is especially important in the kernel.
75	 * 3) This code never prefetches cachelines past the end
76	 *    of the source buffer.
77	 */
78
79	.text
80	.align		64
81
82	/* The cheetah's flexible spine, oversized liver, enlarged heart,
83	 * slender muscular body, and claws make it the swiftest hunter
84	 * in Africa and the fastest animal on land.  Can reach speeds
85	 * of up to 2.4GB per second.
86	 */
87
88	.globl	FUNC_NAME
89	.type	FUNC_NAME,#function
90FUNC_NAME:	/* %o0=dst, %o1=src, %o2=len */
91	srlx		%o2, 31, %g2
92	cmp		%g2, 0
93	tne		%xcc, 5
94	PREAMBLE
95	mov		%o0, %o4
96	cmp		%o2, 0
97	be,pn		%XCC, 85f
98	 or		%o0, %o1, %o3
99	cmp		%o2, 16
100	blu,a,pn	%XCC, 80f
101	 or		%o3, %o2, %o3
102
103	cmp		%o2, (3 * 64)
104	blu,pt		%XCC, 70f
105	 andcc		%o3, 0x7, %g0
106
107	/* Clobbers o5/g1/g2/g3/g7/icc/xcc.  We must preserve
108	 * o5 from here until we hit VISExitHalf.
109	 */
110	VISEntryHalf
111
112	/* Is 'dst' already aligned on an 64-byte boundary? */
113	andcc		%o0, 0x3f, %g2
114	be,pt		%XCC, 2f
115
116	/* Compute abs((dst & 0x3f) - 0x40) into %g2.  This is the number
117	 * of bytes to copy to make 'dst' 64-byte aligned.  We pre-
118	 * subtract this from 'len'.
119	 */
120	 sub		%o0, %o1, GLOBAL_SPARE
121	sub		%g2, 0x40, %g2
122	sub		%g0, %g2, %g2
123	sub		%o2, %g2, %o2
124	andcc		%g2, 0x7, %g1
125	be,pt		%icc, 2f
126	 and		%g2, 0x38, %g2
127
1281:	subcc		%g1, 0x1, %g1
129	EX_LD_FP(LOAD(ldub, %o1 + 0x00, %o3))
130	EX_ST_FP(STORE(stb, %o3, %o1 + GLOBAL_SPARE))
131	bgu,pt		%XCC, 1b
132	 add		%o1, 0x1, %o1
133
134	add		%o1, GLOBAL_SPARE, %o0
135
1362:	cmp		%g2, 0x0
137	and		%o1, 0x7, %g1
138	be,pt		%icc, 3f
139	 alignaddr	%o1, %g0, %o1
140
141	EX_LD_FP(LOAD(ldd, %o1, %f4))
1421:	EX_LD_FP(LOAD(ldd, %o1 + 0x8, %f6))
143	add		%o1, 0x8, %o1
144	subcc		%g2, 0x8, %g2
145	faligndata	%f4, %f6, %f0
146	EX_ST_FP(STORE(std, %f0, %o0))
147	be,pn		%icc, 3f
148	 add		%o0, 0x8, %o0
149
150	EX_LD_FP(LOAD(ldd, %o1 + 0x8, %f4))
151	add		%o1, 0x8, %o1
152	subcc		%g2, 0x8, %g2
153	faligndata	%f6, %f4, %f2
154	EX_ST_FP(STORE(std, %f2, %o0))
155	bne,pt		%icc, 1b
156	 add		%o0, 0x8, %o0
157
1583:	LOAD(prefetch, %o1 + 0x000, #one_read)
159	LOAD(prefetch, %o1 + 0x040, #one_read)
160	andn		%o2, (0x40 - 1), GLOBAL_SPARE
161	LOAD(prefetch, %o1 + 0x080, #one_read)
162	LOAD(prefetch, %o1 + 0x0c0, #one_read)
163	LOAD(prefetch, %o1 + 0x100, #one_read)
164	EX_LD_FP(LOAD(ldd, %o1 + 0x000, %f0))
165	LOAD(prefetch, %o1 + 0x140, #one_read)
166	EX_LD_FP(LOAD(ldd, %o1 + 0x008, %f2))
167	LOAD(prefetch, %o1 + 0x180, #one_read)
168	EX_LD_FP(LOAD(ldd, %o1 + 0x010, %f4))
169	LOAD(prefetch, %o1 + 0x1c0, #one_read)
170	faligndata	%f0, %f2, %f16
171	EX_LD_FP(LOAD(ldd, %o1 + 0x018, %f6))
172	faligndata	%f2, %f4, %f18
173	EX_LD_FP(LOAD(ldd, %o1 + 0x020, %f8))
174	faligndata	%f4, %f6, %f20
175	EX_LD_FP(LOAD(ldd, %o1 + 0x028, %f10))
176	faligndata	%f6, %f8, %f22
177
178	EX_LD_FP(LOAD(ldd, %o1 + 0x030, %f12))
179	faligndata	%f8, %f10, %f24
180	EX_LD_FP(LOAD(ldd, %o1 + 0x038, %f14))
181	faligndata	%f10, %f12, %f26
182	EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0))
183
184	subcc		GLOBAL_SPARE, 0x80, GLOBAL_SPARE
185	add		%o1, 0x40, %o1
186	bgu,pt		%XCC, 1f
187	 srl		GLOBAL_SPARE, 6, %o3
188	ba,pt		%xcc, 2f
189	 nop
190
191	.align		64
1921:
193	EX_LD_FP(LOAD(ldd, %o1 + 0x008, %f2))
194	faligndata	%f12, %f14, %f28
195	EX_LD_FP(LOAD(ldd, %o1 + 0x010, %f4))
196	faligndata	%f14, %f0, %f30
197	EX_ST_FP(STORE_BLK(%f16, %o0))
198	EX_LD_FP(LOAD(ldd, %o1 + 0x018, %f6))
199	faligndata	%f0, %f2, %f16
200	add		%o0, 0x40, %o0
201
202	EX_LD_FP(LOAD(ldd, %o1 + 0x020, %f8))
203	faligndata	%f2, %f4, %f18
204	EX_LD_FP(LOAD(ldd, %o1 + 0x028, %f10))
205	faligndata	%f4, %f6, %f20
206	EX_LD_FP(LOAD(ldd, %o1 + 0x030, %f12))
207	subcc		%o3, 0x01, %o3
208	faligndata	%f6, %f8, %f22
209	EX_LD_FP(LOAD(ldd, %o1 + 0x038, %f14))
210
211	faligndata	%f8, %f10, %f24
212	EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0))
213	LOAD(prefetch, %o1 + 0x1c0, #one_read)
214	faligndata	%f10, %f12, %f26
215	bg,pt		%XCC, 1b
216	 add		%o1, 0x40, %o1
217
218	/* Finally we copy the last full 64-byte block. */
2192:
220	EX_LD_FP(LOAD(ldd, %o1 + 0x008, %f2))
221	faligndata	%f12, %f14, %f28
222	EX_LD_FP(LOAD(ldd, %o1 + 0x010, %f4))
223	faligndata	%f14, %f0, %f30
224	EX_ST_FP(STORE_BLK(%f16, %o0))
225	EX_LD_FP(LOAD(ldd, %o1 + 0x018, %f6))
226	faligndata	%f0, %f2, %f16
227	EX_LD_FP(LOAD(ldd, %o1 + 0x020, %f8))
228	faligndata	%f2, %f4, %f18
229	EX_LD_FP(LOAD(ldd, %o1 + 0x028, %f10))
230	faligndata	%f4, %f6, %f20
231	EX_LD_FP(LOAD(ldd, %o1 + 0x030, %f12))
232	faligndata	%f6, %f8, %f22
233	EX_LD_FP(LOAD(ldd, %o1 + 0x038, %f14))
234	faligndata	%f8, %f10, %f24
235	cmp		%g1, 0
236	be,pt		%XCC, 1f
237	 add		%o0, 0x40, %o0
238	EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0))
2391:	faligndata	%f10, %f12, %f26
240	faligndata	%f12, %f14, %f28
241	faligndata	%f14, %f0, %f30
242	EX_ST_FP(STORE_BLK(%f16, %o0))
243	add		%o0, 0x40, %o0
244	add		%o1, 0x40, %o1
245	membar		#Sync
246
247	/* Now we copy the (len modulo 64) bytes at the end.
248	 * Note how we borrow the %f0 loaded above.
249	 *
250	 * Also notice how this code is careful not to perform a
251	 * load past the end of the src buffer.
252	 */
253	and		%o2, 0x3f, %o2
254	andcc		%o2, 0x38, %g2
255	be,pn		%XCC, 2f
256	 subcc		%g2, 0x8, %g2
257	be,pn		%XCC, 2f
258	 cmp		%g1, 0
259
260	sub		%o2, %g2, %o2
261	be,a,pt		%XCC, 1f
262	 EX_LD_FP(LOAD(ldd, %o1 + 0x00, %f0))
263
2641:	EX_LD_FP(LOAD(ldd, %o1 + 0x08, %f2))
265	add		%o1, 0x8, %o1
266	subcc		%g2, 0x8, %g2
267	faligndata	%f0, %f2, %f8
268	EX_ST_FP(STORE(std, %f8, %o0))
269	be,pn		%XCC, 2f
270	 add		%o0, 0x8, %o0
271	EX_LD_FP(LOAD(ldd, %o1 + 0x08, %f0))
272	add		%o1, 0x8, %o1
273	subcc		%g2, 0x8, %g2
274	faligndata	%f2, %f0, %f8
275	EX_ST_FP(STORE(std, %f8, %o0))
276	bne,pn		%XCC, 1b
277	 add		%o0, 0x8, %o0
278
279	/* If anything is left, we copy it one byte at a time.
280	 * Note that %g1 is (src & 0x3) saved above before the
281	 * alignaddr was performed.
282	 */
2832:
284	cmp		%o2, 0
285	add		%o1, %g1, %o1
286	VISExitHalf
287	be,pn		%XCC, 85f
288	 sub		%o0, %o1, %o3
289
290	andcc		%g1, 0x7, %g0
291	bne,pn		%icc, 90f
292	 andcc		%o2, 0x8, %g0
293	be,pt		%icc, 1f
294	 nop
295	EX_LD(LOAD(ldx, %o1, %o5))
296	EX_ST(STORE(stx, %o5, %o1 + %o3))
297	add		%o1, 0x8, %o1
298
2991:	andcc		%o2, 0x4, %g0
300	be,pt		%icc, 1f
301	 nop
302	EX_LD(LOAD(lduw, %o1, %o5))
303	EX_ST(STORE(stw, %o5, %o1 + %o3))
304	add		%o1, 0x4, %o1
305
3061:	andcc		%o2, 0x2, %g0
307	be,pt		%icc, 1f
308	 nop
309	EX_LD(LOAD(lduh, %o1, %o5))
310	EX_ST(STORE(sth, %o5, %o1 + %o3))
311	add		%o1, 0x2, %o1
312
3131:	andcc		%o2, 0x1, %g0
314	be,pt		%icc, 85f
315	 nop
316	EX_LD(LOAD(ldub, %o1, %o5))
317	ba,pt		%xcc, 85f
318	 EX_ST(STORE(stb, %o5, %o1 + %o3))
319
320	.align		64
32170: /* 16 < len <= 64 */
322	bne,pn		%XCC, 75f
323	 sub		%o0, %o1, %o3
324
32572:
326	andn		%o2, 0xf, GLOBAL_SPARE
327	and		%o2, 0xf, %o2
3281:	subcc		GLOBAL_SPARE, 0x10, GLOBAL_SPARE
329	EX_LD(LOAD(ldx, %o1 + 0x00, %o5))
330	EX_LD(LOAD(ldx, %o1 + 0x08, %g1))
331	EX_ST(STORE(stx, %o5, %o1 + %o3))
332	add		%o1, 0x8, %o1
333	EX_ST(STORE(stx, %g1, %o1 + %o3))
334	bgu,pt		%XCC, 1b
335	 add		%o1, 0x8, %o1
33673:	andcc		%o2, 0x8, %g0
337	be,pt		%XCC, 1f
338	 nop
339	sub		%o2, 0x8, %o2
340	EX_LD(LOAD(ldx, %o1, %o5))
341	EX_ST(STORE(stx, %o5, %o1 + %o3))
342	add		%o1, 0x8, %o1
3431:	andcc		%o2, 0x4, %g0
344	be,pt		%XCC, 1f
345	 nop
346	sub		%o2, 0x4, %o2
347	EX_LD(LOAD(lduw, %o1, %o5))
348	EX_ST(STORE(stw, %o5, %o1 + %o3))
349	add		%o1, 0x4, %o1
3501:	cmp		%o2, 0
351	be,pt		%XCC, 85f
352	 nop
353	ba,pt		%xcc, 90f
354	 nop
355
35675:
357	andcc		%o0, 0x7, %g1
358	sub		%g1, 0x8, %g1
359	be,pn		%icc, 2f
360	 sub		%g0, %g1, %g1
361	sub		%o2, %g1, %o2
362
3631:	subcc		%g1, 1, %g1
364	EX_LD(LOAD(ldub, %o1, %o5))
365	EX_ST(STORE(stb, %o5, %o1 + %o3))
366	bgu,pt		%icc, 1b
367	 add		%o1, 1, %o1
368
3692:	add		%o1, %o3, %o0
370	andcc		%o1, 0x7, %g1
371	bne,pt		%icc, 8f
372	 sll		%g1, 3, %g1
373
374	cmp		%o2, 16
375	bgeu,pt		%icc, 72b
376	 nop
377	ba,a,pt		%xcc, 73b
378
3798:	mov		64, %o3
380	andn		%o1, 0x7, %o1
381	EX_LD(LOAD(ldx, %o1, %g2))
382	sub		%o3, %g1, %o3
383	andn		%o2, 0x7, GLOBAL_SPARE
384	sllx		%g2, %g1, %g2
3851:	EX_LD(LOAD(ldx, %o1 + 0x8, %g3))
386	subcc		GLOBAL_SPARE, 0x8, GLOBAL_SPARE
387	add		%o1, 0x8, %o1
388	srlx		%g3, %o3, %o5
389	or		%o5, %g2, %o5
390	EX_ST(STORE(stx, %o5, %o0))
391	add		%o0, 0x8, %o0
392	bgu,pt		%icc, 1b
393	 sllx		%g3, %g1, %g2
394
395	srl		%g1, 3, %g1
396	andcc		%o2, 0x7, %o2
397	be,pn		%icc, 85f
398	 add		%o1, %g1, %o1
399	ba,pt		%xcc, 90f
400	 sub		%o0, %o1, %o3
401
402	.align		64
40380: /* 0 < len <= 16 */
404	andcc		%o3, 0x3, %g0
405	bne,pn		%XCC, 90f
406	 sub		%o0, %o1, %o3
407
4081:
409	subcc		%o2, 4, %o2
410	EX_LD(LOAD(lduw, %o1, %g1))
411	EX_ST(STORE(stw, %g1, %o1 + %o3))
412	bgu,pt		%XCC, 1b
413	 add		%o1, 4, %o1
414
41585:	retl
416	 mov		EX_RETVAL(%o4), %o0
417
418	.align		32
41990:
420	subcc		%o2, 1, %o2
421	EX_LD(LOAD(ldub, %o1, %g1))
422	EX_ST(STORE(stb, %g1, %o1 + %o3))
423	bgu,pt		%XCC, 90b
424	 add		%o1, 1, %o1
425	retl
426	 mov		EX_RETVAL(%o4), %o0
427
428	.size		FUNC_NAME, .-FUNC_NAME
429