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1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2004-2005 by Jens Arnold
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
19 *
20 ****************************************************************************/
21#include "config.h"
22
23 .section .icode,"ax",@progbits
24
25#define FULLSPEED /* use burst writing for word aligned destinations */
26 .align 2
27 .global memcpy
28 .global __memcpy_fwd_entry
29 .type memcpy,@function
30
31/* Copies <length> bytes of data in memory from <source> to <dest>
32 * This version is optimized for speed
33 *
34 * arguments:
35 * (4,%sp) - destination address
36 * (8,%sp) - source address
37 * (12,%sp) - length
38 *
39 * return value:
40 * %d0 - destination address (like ANSI version)
41 *
42 * register usage:
43 * %a0 - current source address
44 * %a1 - current dest address
45 * %a2 - source end address (in line-copy loops)
46 * %d0 - data / scratch
47 * %d1 - source end address (byte and longword copy) / data / scratch
48 * %d2 - data / scratch
49 * %d3..%d7 - data
50 *
51 * For maximum speed this routine reads and writes whole lines using burst
52 * move (movem.l) where possible. For byte aligned destinations (long+1 and
53 * long+3) it writes longwords only. Same goes for word aligned destinations
54 * if FULLSPEED is undefined.
55 */
56memcpy:
57 move.l (4,%sp),%a1 /* Destination */
58 move.l (8,%sp),%a0 /* Source */
59 move.l (12,%sp),%d1 /* Length */
60
61__memcpy_fwd_entry:
62 add.l %a0,%d1 /* %d1 = source end */
63
64 move.l %a0,%d0
65 addq.l #7,%d0
66 and.l #0xFFFFFFFC,%d0 /* %d0 = first source long bound + 4 */
67 cmp.l %d0,%d1 /* at least one aligned longword to copy? */
68 blo.w .bytes2_start /* no, jump directly to trailing byte loop */
69
70 subq.l #4,%d0 /* %d0 = first source long bound */
71 cmp.l %a0,%d0 /* any bytes to copy? */
72 jls .bytes1_end /* no: skip byte loop */
73
74 /* leading byte loop: copies 0..3 bytes */
75.bytes1_loop:
76 move.b (%a0)+,(%a1)+ /* copy byte */
77 cmp.l %a0,%d0 /* runs %a0 up to first long bound */
78 jhi .bytes1_loop
79
80.bytes1_end:
81 moveq.l #31,%d0
82 add.l %a0,%d0
83 and.l #0xFFFFFFF0,%d0 /* %d0 = first source line bound + 16 */
84 cmp.l %d0,%d1 /* at least one aligned line to copy? */
85 blo.w .long_start /* no: jump to longword copy loop */
86
87 lea.l (-28,%sp),%sp /* free up some registers */
88 movem.l %d2-%d7/%a2,(%sp)
89
90 moveq.l #16,%d2
91 sub.l %d2,%d0 /* %d0 = first source line bound */
92 move.l %d1,%a2 /* %a2 = end address */
93 lea.l (-15,%a2),%a2 /* adjust end address for loops doing 16 bytes/ pass */
94 move.l %a1,%d1
95 moveq.l #3,%d2 /* mask */
96 and.l %d2,%d1
97 jmp.l (2,%pc,%d1.l*4) /* switch (dest_addr & 3) */
98 bra.w .lines_do0_start
99 bra.w .lines_do1_start
100 bra.w .lines_do2_start
101 /* bra.w .lines_do3_start implicit */
102
103 /* byte aligned destination (long + 3): use line burst reads in main loop */
104.lines_do3_start:
105 moveq.l #24,%d1 /* shift count for shifting by 3 bytes */
106 cmp.l %a0,%d0 /* any leading longwords? */
107 jhi .lines_do3_head_start /* yes: leading longword copy */
108
109 movem.l (%a0),%d4-%d7 /* load first line */
110 lea.l (16,%a0),%a0
111 move.l %d4,%d2
112 lsr.l %d1,%d2 /* get high byte of first longword */
113 move.b %d2,(%a1)+ /* store byte */
114 jra .lines_do3_entry /* jump into main loop */
115
116.lines_do3_head_start:
117 move.l (%a0)+,%d7 /* load first longword */
118 move.l %d7,%d2
119 lsr.l %d1,%d2 /* get high byte */
120 move.b %d2,(%a1)+ /* store byte */
121 jra .lines_do3_head_entry /* jump into leading longword loop */
122
123.lines_do3_head_loop:
124 move.l %d7,%d6 /* move old longword away */
125 move.l (%a0)+,%d7 /* load new longword */
126 move.l %d7,%d2
127 lsr.l %d1,%d2 /* get high byte */
128 or.l %d2,%d6 /* combine with old lower 3 bytes */
129 move.l %d6,(%a1)+ /* store longword */
130.lines_do3_head_entry:
131 lsl.l #8,%d7 /* shift up lower 3 bytes */
132 cmp.l %a0,%d0 /* runs %a0 up to first line bound */
133 jhi .lines_do3_head_loop
134
135.lines_do3_loop:
136 move.l %d7,%d3 /* move last longword of old line away */
137 movem.l (%a0),%d4-%d7 /* load new line */
138 lea.l (16,%a0),%a0
139 move.l %d4,%d2
140 lsr.l %d1,%d2 /* get high byte of 1st longword */
141 or.l %d2,%d3 /* combine with old lower 3 bytes */
142 move.l %d3,(%a1)+ /* store longword */
143.lines_do3_entry:
144 lsl.l #8,%d4 /* shift up lower 3 bytes */
145 move.l %d5,%d2
146 lsr.l %d1,%d2 /* get high byte of 2nd longword */
147 or.l %d2,%d4 /* combine with 1st lower 3 bytes */
148 move.l %d4,(%a1)+ /* store longword */
149 lsl.l #8,%d5 /* shift up lower 3 bytes */
150 move.l %d6,%d2
151 lsr.l %d1,%d2 /* get high byte of 3rd longword */
152 or.l %d2,%d5 /* combine with 2nd lower 3 bytes */
153 move.l %d5,(%a1)+ /* store longword */
154 lsl.l #8,%d6 /* shift up lower 3 bytes */
155 move.l %d7,%d2
156 lsr.l %d1,%d2 /* get high byte of 4th longword */
157 or.l %d2,%d6 /* combine with 3rd lower 3 bytes */
158 move.l %d6,(%a1)+ /* store longword */
159 lsl.l #8,%d7 /* shift up lower 3 bytes */
160 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
161 jhi .lines_do3_loop
162
163 lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
164 cmp.l %a0,%a2 /* any trailing longwords? */
165 jls .lines_do3_tail_end /* no: just store last lower 3 bytes */
166
167.lines_do3_tail_loop:
168 move.l %d7,%d6 /* move old longword away */
169 move.l (%a0)+,%d7 /* load new longword */
170 move.l %d7,%d2
171 lsr.l %d1,%d2 /* get high byte */
172 or.l %d2,%d6 /* combine with old lower 3 bytes */
173 move.l %d6,(%a1)+ /* store longword */
174 lsl.l #8,%d7 /* shift up lower 3 bytes */
175 cmp.l %a0,%a2 /* runs %a0 up to last long bound */
176 jhi .lines_do3_tail_loop
177
178.lines_do3_tail_end:
179 swap %d7 /* get high word */
180 move.w %d7,(%a1)+ /* store word */
181 lsr.l %d1,%d7 /* get moved-up low byte */
182 move.b %d7,(%a1)+ /* store byte */
183 jra .lines_end
184
185 /* byte aligned destination (long + 1): use line burst reads in main loop */
186.lines_do1_start:
187 moveq.l #24,%d1 /* shift count for shifting by 3 bytes */
188 cmp.l %a0,%d0 /* any leading longwords? */
189 jhi .lines_do1_head_start /* yes: leading longword copy */
190
191 movem.l (%a0),%d4-%d7 /* load first line */
192 lea.l (16,%a0),%a0
193 move.l %d4,%d2 /* first longword, bytes 3210 */
194 lsr.l #8,%d2 /* first longword, bytes .321 */
195 swap %d2 /* first longword, bytes 21.3 */
196 move.b %d2,(%a1)+ /* store byte */
197 swap %d2 /* first longword, bytes .321 */
198 move.w %d2,(%a1)+ /* store word */
199 jra .lines_do1_entry
200
201.lines_do1_head_start:
202 move.l (%a0)+,%d7 /* load first longword */
203 move.l %d7,%d2 /* first longword, bytes 3210 */
204 lsr.l #8,%d2 /* first longword, bytes .321 */
205 swap %d2 /* first longword, bytes 21.3 */
206 move.b %d2,(%a1)+ /* store byte */
207 swap %d2 /* first longword, bytes .321 */
208 move.w %d2,(%a1)+ /* store word */
209 jra .lines_do1_head_entry
210
211.lines_do1_head_loop:
212 move.l %d7,%d6 /* move old longword away */
213 move.l (%a0)+,%d7 /* load new longword */
214 move.l %d7,%d2
215 lsr.l #8,%d2 /* get upper 3 bytes */
216 or.l %d2,%d6 /* combine with old low byte */
217 move.l %d6,(%a1)+ /* store longword */
218.lines_do1_head_entry:
219 lsl.l %d1,%d7 /* shift up low byte */
220 cmp.l %a0,%d0 /* runs %a0 up to first line bound */
221 jhi .lines_do1_head_loop
222
223.lines_do1_loop:
224 move.l %d7,%d3 /* move last longword of old line away */
225 movem.l (%a0),%d4-%d7 /* load new line */
226 lea.l (16,%a0),%a0
227 move.l %d4,%d2
228 lsr.l #8,%d2 /* get upper 3 bytes of 1st longword */
229 or.l %d2,%d3 /* combine with low byte of old longword */
230 move.l %d3,(%a1)+ /* store longword */
231.lines_do1_entry:
232 lsl.l %d1,%d4 /* shift up low byte */
233 move.l %d5,%d2
234 lsr.l #8,%d2 /* get upper 3 bytes of 2nd longword */
235 or.l %d2,%d4 /* combine with low byte of 1st longword */
236 move.l %d4,(%a1)+ /* store longword */
237 lsl.l %d1,%d5 /* shift up low byte */
238 move.l %d6,%d2
239 lsr.l #8,%d2 /* get upper 3 bytes of 3rd longword */
240 or.l %d2,%d5 /* combine with low byte of 2nd longword */
241 move.l %d5,(%a1)+ /* store longword */
242 lsl.l %d1,%d6 /* shift up low byte */
243 move.l %d7,%d2
244 lsr.l #8,%d2 /* get upper 3 bytes of 4th longword */
245 or.l %d2,%d6 /* combine with low byte of 4th longword */
246 move.l %d6,(%a1)+ /* store longword */
247 lsl.l %d1,%d7 /* shift up low byte */
248 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
249 jhi .lines_do1_loop
250
251 lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
252 cmp.l %a0,%a2 /* any trailing longwords? */
253 jls .lines_do1_tail_end /* no: just store last low byte */
254
255.lines_do1_tail_loop:
256 move.l %d7,%d6 /* move old longword away */
257 move.l (%a0)+,%d7 /* load new longword */
258 move.l %d7,%d2
259 lsr.l #8,%d2 /* get upper 3 bytes */
260 or.l %d2,%d6 /* combine with old low byte */
261 move.l %d6,(%a1)+ /* store longword */
262 lsl.l %d1,%d7 /* shift up low byte */
263 cmp.l %a0,%a2 /* runs %a0 up to last long bound */
264 jhi .lines_do1_tail_loop
265
266.lines_do1_tail_end:
267 lsr.l %d1,%d7 /* get shifted-up low byte */
268 move.b %d7,(%a1)+ /* store byte */
269 jra .lines_end
270
271 /* long aligned destination (line + 0/4/8/12): head */
272.lines_do0_head_loop:
273 move.l (%a0)+,(%a1)+ /* copy longword */
274.lines_do0_start:
275 cmp.l %a0,%d0 /* runs %a0 up to first line bound */
276 jhi .lines_do0_head_loop
277
278.lines_do0_head_end:
279 move.l %a1,%d1
280 lsr.l #2,%d1
281 moveq.l #3,%d0 /* mask */
282 and.l %d0,%d1
283 moveq.l #16,%d0 /* address increment for one main loop pass */
284 jmp.l (2,%pc,%d1.l*2) /* switch ((dest_addr >> 2) & 3) */
285 bra.b .lines_lo0_start
286 bra.b .lines_lo4_start
287 bra.b .lines_lo8_start
288 /* bra.b .lines_lo12_start implicit */
289
290 /* long aligned destination (line + 12): use line bursts in the loop */
291.lines_lo12_start:
292 movem.l (%a0),%d4-%d7 /* load first line */
293 add.l %d0,%a0
294 move.l %d4,(%a1)+ /* store 1st longword */
295 cmp.l %a0,%a2 /* any full lines? */
296 jls .lines_lo12_end /* no: skip main loop */
297
298.lines_lo12_loop:
299 move.l %d5,%d1 /* move last 3 longwords of old line away */
300 move.l %d6,%d2
301 move.l %d7,%d3
302 movem.l (%a0),%d4-%d7 /* load new line */
303 add.l %d0,%a0
304 movem.l %d1-%d4,(%a1) /* store line (3 old + 1 new longwords) */
305 add.l %d0,%a1
306 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
307 jhi .lines_lo12_loop
308
309 /* long aligned destination (line + 0/4/8/12): tail */
310.lines_lo12_end:
311 move.l %d5,(%a1)+ /* store 3rd last longword */
312.lines_lo8_end:
313 move.l %d6,(%a1)+ /* store 2nd last longword */
314.lines_lo4_end:
315 move.l %d7,(%a1)+ /* store last longword */
316.lines_lo0_end:
317 lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
318 cmp.l %a0,%a2 /* any trailing longwords? */
319 jls .lines_end /* no: get outta here */
320
321.lines_do0_tail_loop:
322 move.l (%a0)+,(%a1)+ /* copy longword */
323 cmp.l %a0,%a2 /* runs %a0 up to last long bound */
324 jhi .lines_do0_tail_loop
325
326 jra .lines_end
327
328 /* line aligned destination: use line bursts in the loop */
329.lines_lo0_start:
330.lines_lo0_loop:
331 movem.l (%a0),%d4-%d7 /* load line */
332 add.l %d0,%a0
333 movem.l %d4-%d7,(%a1) /* store line */
334 add.l %d0,%a1
335 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
336 jhi .lines_lo0_loop
337
338 jra .lines_lo0_end /* handle trailing longwords */
339
340 /* long aligned destination (line + 4): use line bursts in the loop */
341.lines_lo4_start:
342 movem.l (%a0),%d4-%d7 /* load first line */
343 add.l %d0,%a0
344 move.l %d4,(%a1)+ /* store 1st longword */
345 move.l %d5,(%a1)+ /* store 2nd longword */
346 move.l %d6,(%a1)+ /* store 3rd longword */
347 cmp.l %a0,%a2 /* any full lines? */
348 jls .lines_lo4_end /* no: skip main loop */
349
350.lines_lo4_loop:
351 move.l %d7,%d3 /* move last longword of old line away */
352 movem.l (%a0),%d4-%d7 /* load new line */
353 add.l %d0,%a0
354 movem.l %d3-%d6,(%a1) /* store line (1 old + 3 new longwords) */
355 add.l %d0,%a1
356 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
357 jhi .lines_lo4_loop
358
359 jra .lines_lo4_end /* handle trailing longwords */
360
361 /* long aligned destination (line + 8): use line bursts in the loop */
362.lines_lo8_start:
363 movem.l (%a0),%d4-%d7 /* load first line */
364 add.l %d0,%a0
365 move.l %d4,(%a1)+ /* store 1st longword */
366 move.l %d5,(%a1)+ /* store 2nd longword */
367 cmp.l %a0,%a2
368 jls .lines_lo8_end
369
370.lines_lo8_loop:
371 move.l %d6,%d2 /* move last 2 longwords of old line away */
372 move.l %d7,%d3
373 movem.l (%a0),%d4-%d7 /* load new line */
374 add.l %d0,%a0
375 movem.l %d2-%d5,(%a1) /* store line (2 old + 2 new longwords) */
376 add.l %d0,%a1
377 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
378 jhi .lines_lo8_loop
379
380 jra .lines_lo8_end /* handle trailing longwords */
381
382#ifdef FULLSPEED
383
384 /* word aligned destination (line + 2/6/10/14): head */
385.lines_do2_start:
386 cmp.l %a0,%d0 /* any leading longwords? */
387 jls .lines_do2_selector /* no: jump to mainloop selector */
388
389 move.l (%a0)+,%d7 /* load first longword */
390 swap %d7 /* swap words */
391 move.w %d7,(%a1)+ /* store high word */
392 cmp.l %a0,%d0 /* any more longword? */
393 jls .lines_do2_head_end /* no: skip head loop */
394
395.lines_do2_head_loop:
396 move.l %d7,%d6 /* move old longword away */
397 move.l (%a0)+,%d7 /* load new longword */
398 swap %d7 /* swap words */
399 move.w %d7,%d6 /* combine high word with old low word */
400 move.l %d6,(%a1)+ /* store longword */
401 cmp.l %a0,%d0 /* runs %a0 up to first line bound */
402 jhi .lines_do2_head_loop
403
404.lines_do2_head_end:
405 swap %d7 /* undo swap */
406 move.w %d7,(%a1)+ /* store word */
407
408.lines_do2_selector:
409 move.l %a1,%d1
410 lsr.l #2,%d1
411 moveq.l #3,%d0 /* mask */
412 and.l %d0,%d1
413 moveq.l #16,%d0 /* address increment for one main loop pass */
414 jmp.l (2,%pc,%d1.l*4) /* switch ((dest_addr >> 2) & 3) */
415 bra.w .lines_lo2_start
416 bra.w .lines_lo6_start
417 bra.w .lines_lo10_start
418 /* bra.w .lines_lo14_start implicit */
419
420 /* word aligned destination (line + 14): use line bursts in the loop */
421.lines_lo14_start:
422 movem.l (%a0),%d4-%d7 /* load first line */
423 add.l %d0,%a0
424 swap %d4 /* swap words of 1st long */
425 move.w %d4,(%a1)+ /* store word */
426 jra .lines_lo14_entry /* jump into main loop */
427
428.lines_lo14_loop:
429 move.l %d4,%d0 /* move old line away */
430 move.l %d5,%d1
431 move.l %d6,%d2
432 move.l %d7,%d3
433 movem.l (%a0),%d4-%d7 /* load new line */
434 lea.l (16,%a0),%a0
435 swap %d4 /* swap words of 1st long */
436 move.w %d4,%d3 /* combine 1st high word with old low word */
437 movem.l %d0-%d3,(%a1) /* store line */
438 lea.l (16,%a1),%a1
439.lines_lo14_entry:
440 swap %d5 /* swap words of 2nd long */
441 move.w %d5,%d4 /* combine 2nd high word with 1st low word */
442 swap %d6 /* swap words of 3rd long */
443 move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
444 swap %d7 /* swap words of 4th long */
445 move.w %d7,%d6 /* combine 4th high word with 3rd low word */
446 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
447 jhi .lines_lo14_loop
448
449 /* word aligned destination (line + 2/6/10/14): tail */
450.lines_lo14_end:
451 move.l %d4,(%a1)+ /* store third last longword */
452.lines_lo10_end:
453 move.l %d5,(%a1)+ /* store second last longword */
454.lines_lo6_end:
455 move.l %d6,(%a1)+ /* store last longword */
456.lines_lo2_end:
457 lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
458 cmp.l %a0,%a2 /* any trailing longwords? */
459 jls .lines_do2_tail_end /* no: skip tail loop */
460
461.lines_do2_tail_loop:
462 move.l %d7,%d6 /* move old longword away */
463 move.l (%a0)+,%d7 /* load new longword */
464 swap %d7 /* swap words */
465 move.w %d7,%d6 /* combine high word with old low word */
466 move.l %d6,(%a1)+ /* store longword */
467 cmp.l %a0,%a2 /* runs %a0 up to last long bound */
468 jhi .lines_do2_tail_loop
469
470.lines_do2_tail_end:
471 swap %d7 /* undo swap */
472 move.w %d7,(%a1)+ /* store last word */
473 jra .lines_end
474
475 /* word aligned destination (line + 2): use line bursts in the loop */
476.lines_lo2_start:
477 movem.l (%a0),%d4-%d7 /* load first line */
478 add.l %d0,%a0
479 swap %d4 /* swap words of 1st long */
480 move.w %d4,(%a1)+ /* store high word */
481 swap %d5 /* swap words of 2nd long */
482 move.w %d5,%d4 /* combine 2nd high word with 1st low word */
483 swap %d6 /* swap words of 3rd long */
484 move.w %d6,%d5 /* combine 3nd high word with 2nd low word */
485 swap %d7 /* swap words of 4th long */
486 move.w %d7,%d6 /* combine 4th high word with 3rd low word */
487 move.l %d4,(%a1)+ /* store 1st longword */
488 move.l %d5,(%a1)+ /* store 2nd longword */
489 move.l %d6,(%a1)+ /* store 3rd longword */
490 cmp.l %a0,%a2 /* any full lines? */
491 jls .lines_lo2_end /* no: skip main loop */
492
493.lines_lo2_loop:
494 move.l %d7,%d3 /* move last longword of old line away */
495 movem.l (%a0),%d4-%d7 /* load line */
496 add.l %d0,%a0
497 swap %d4 /* swap words of 1st long */
498 move.w %d4,%d3 /* combine 1st high word with old low word */
499 swap %d5 /* swap words of 2nd long */
500 move.w %d5,%d4 /* combine 2nd high word with 1st low word */
501 swap %d6 /* swap words of 3rd long */
502 move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
503 swap %d7 /* swap words of 4th long */
504 move.w %d7,%d6 /* combine 4th high word with 3rd low word */
505 movem.l %d3-%d6,(%a1) /* store line */
506 add.l %d0,%a1
507 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
508 jhi .lines_lo2_loop
509
510 jra .lines_lo2_end /* handle trailing longwords */
511
512 /* word aligned destination (line + 6): use line bursts in the loop */
513.lines_lo6_start:
514 movem.l (%a0),%d4-%d7 /* load first line */
515 add.l %d0,%a0
516 swap %d4 /* swap words of 1st long */
517 move.w %d4,(%a1)+ /* store high word */
518 swap %d5 /* swap words of 2nd long */
519 move.w %d5,%d4 /* combine 2nd high word with 1st low word */
520 swap %d6 /* swap words of 3rd long */
521 move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
522 move.l %d4,(%a1)+ /* store 1st longword */
523 move.l %d5,(%a1)+ /* store 2nd longword */
524 jra .lines_lo6_entry /* jump into main loop */
525
526.lines_lo6_loop:
527 move.l %d6,%d2 /* move last 2 longwords of old line away */
528 move.l %d7,%d3
529 movem.l (%a0),%d4-%d7 /* load line */
530 add.l %d0,%a0
531 swap %d4 /* swap words of 1st long */
532 move.w %d4,%d3 /* combine 1st high word with old low word */
533 swap %d5 /* swap words of 2nd long */
534 move.w %d5,%d4 /* combine 2nd high word with 1st low word */
535 swap %d6 /* swap words of 3rd long */
536 move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
537 movem.l %d2-%d5,(%a1) /* store line */
538 add.l %d0,%a1
539.lines_lo6_entry:
540 swap %d7 /* swap words of 4th long */
541 move.w %d7,%d6 /* combine 4th high word with 3rd low word */
542 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
543 jhi .lines_lo6_loop
544
545 jra .lines_lo6_end /* handle trailing longwords */
546
547 /* word aligned destination (line + 10): use line bursts in the loop */
548.lines_lo10_start:
549 movem.l (%a0),%d4-%d7 /* load first line */
550 add.l %d0,%a0
551 swap %d4 /* swap words of 1st long */
552 move.w %d4,(%a1)+ /* store high word */
553 swap %d5 /* swap words of 2nd long */
554 move.w %d5,%d4 /* combine 2nd high word with 1st low word */
555 move.l %d4,(%a1)+ /* store 1st longword */
556 jra .lines_lo10_entry /* jump into main loop */
557
558.lines_lo10_loop:
559 move.l %d5,%d1 /* move last 3 longwords of old line away */
560 move.l %d6,%d2
561 move.l %d7,%d3
562 movem.l (%a0),%d4-%d7 /* load line */
563 add.l %d0,%a0
564 swap %d4 /* swap words of 1st long */
565 move.w %d4,%d3 /* combine 1st high word with old low word */
566 swap %d5 /* swap words of 2nd long */
567 move.w %d5,%d4 /* combine 2nd high word with 1st low word */
568 movem.l %d1-%d4,(%a1) /* store line */
569 add.l %d0,%a1
570.lines_lo10_entry:
571 swap %d6 /* swap words of 3rd long */
572 move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
573 swap %d7 /* swap words of 4th long */
574 move.w %d7,%d6 /* combine 4th high word with 3rd low word */
575 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
576 jhi .lines_lo10_loop
577
578 jra .lines_lo10_end /* handle trailing longwords */
579
580#else /* !FULLSPEED */
581
582 /* word aligned destination (long + 2): use line burst reads in the loop */
583.lines_do2_start:
584 cmp.l %a0,%d0 /* any leading longwords? */
585 jhi .lines_do2_head_start /* yes: leading longword copy */
586
587 movem.l (%a0),%d4-%d7 /* load first line */
588 lea.l (16,%a0),%a0
589 swap %d4 /* swap words of 1st long */
590 move.w %d4,(%a1)+ /* store high word */
591 jra .lines_do2_entry /* jump into main loop */
592
593.lines_do2_head_start:
594 move.l (%a0)+,%d7 /* load first longword */
595 swap %d7 /* swap words */
596 move.w %d7,(%a1)+ /* store high word */
597 cmp.l %a0,%d0 /* any full longword? */
598 jls .lines_do2_loop /* no: skip head loop */
599
600.lines_do2_head_loop:
601 move.l %d7,%d6 /* move old longword away */
602 move.l (%a0)+,%d7 /* load new longword */
603 swap %d7 /* swap words */
604 move.w %d7,%d6 /* combine high word with old low word */
605 move.l %d6,(%a1)+ /* store longword */
606 cmp.l %a0,%d0 /* runs %a0 up to first line bound */
607 jhi .lines_do2_head_loop
608
609.lines_do2_loop:
610 move.l %d7,%d3 /* move last longword of old line away */
611 movem.l (%a0),%d4-%d7 /* load line */
612 lea.l (16,%a0),%a0
613 swap %d4 /* swap words of 1st long */
614 move.w %d4,%d3 /* combine 1st high word with old low word */
615 move.l %d3,(%a1)+ /* store 1st longword */
616.lines_do2_entry:
617 swap %d5 /* swap words of 2nd long */
618 move.w %d5,%d4 /* combine 2nd high word with 1st low word */
619 move.l %d4,(%a1)+ /* store 2nd longword */
620 swap %d6 /* swap words of 3rd long */
621 move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
622 move.l %d5,(%a1)+ /* store 3rd longword */
623 swap %d7 /* swap words of 4th long */
624 move.w %d7,%d6 /* combine 4th high word with 3rd low word */
625 move.l %d6,(%a1)+ /* store 4th longword */
626 cmp.l %a0,%a2 /* runs %a0 up to last line bound */
627 jhi .lines_do2_loop
628
629.lines_do2_end:
630 lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
631 cmp.l %a0,%a2 /* any trailing longwords? */
632 jls .lines_do2_tail_end /* no: skip tail loop */
633
634.lines_do2_tail_loop:
635 move.l %d7,%d6 /* move old longword away */
636 move.l (%a0)+,%d7 /* load new longword */
637 swap %d7 /* swap words */
638 move.w %d7,%d6 /* combine high word with old low word */
639 move.l %d6,(%a1)+ /* store longword */
640 cmp.l %a0,%a2 /* runs %a0 up to last long bound */
641 jhi .lines_do2_tail_loop
642
643.lines_do2_tail_end:
644 swap %d7 /* undo swap */
645 move.w %d7,(%a1)+ /* store last word */
646 /* jra .lines_end implicit */
647
648#endif /* !FULLSPEED */
649
650.lines_end:
651 addq.l #3,%a2 /* readjust end address */
652 move.l %a2,%d1 /* end address in %d1 again */
653 movem.l (%sp),%d2-%d7/%a2 /* restore registers */
654 lea.l (28,%sp),%sp
655 jra .bytes2_start /* jump to trailing byte loop */
656
657.long_start:
658 subq.l #3,%d1 /* adjust end address for doing 4 bytes/ pass */
659
660 /* longword copy loop - no lines */
661.long_loop:
662 move.l (%a0)+,(%a1)+ /* copy longword (write can be unaligned) */
663 cmp.l %a0,%d1 /* runs %a0 up to last long bound */
664 jhi .long_loop
665
666 addq.l #3,%d1 /* readjust end address */
667 cmp.l %a0,%d1 /* any bytes left? */
668 jls .bytes2_end /* no: skip trailing byte loop */
669
670 /* trailing byte loop */
671.bytes2_loop:
672 move.b (%a0)+,(%a1)+ /* copy byte */
673.bytes2_start:
674 cmp.l %a0,%d1 /* runs %a0 up to end address */
675 jhi .bytes2_loop
676
677.bytes2_end:
678 move.l (4,%sp),%d0 /* return destination */
679 rts
680
681.end:
682 .size memcpy,.end-memcpy
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-25 07:24:38 +0000