| Jörg Hohensohn | b61cf76 | 2004-03-18 22:06:36 +0000 | [diff] [blame] | 1 | /*************************************************************************** |
| 2 | * __________ __ ___. |
| 3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| 4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| 5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| 6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| 7 | * \/ \/ \/ \/ \/ |
| 8 | * $Id$ |
| 9 | * |
| Jens Arnold | c082bc4 | 2005-10-30 20:48:52 +0000 | [diff] [blame] | 10 | * Copyright (C) 2004-2005 by Jens Arnold |
| Jörg Hohensohn | b61cf76 | 2004-03-18 22:06:36 +0000 | [diff] [blame] | 11 | * |
| 12 | * All files in this archive are subject to the GNU General Public License. |
| 13 | * See the file COPYING in the source tree root for full license agreement. |
| 14 | * |
| 15 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| 16 | * KIND, either express or implied. |
| 17 | * |
| 18 | ****************************************************************************/ |
| Linus Nielsen Feltzing | ba80918 | 2004-10-26 05:40:24 +0000 | [diff] [blame] | 19 | #include "config.h" |
| Jörg Hohensohn | b61cf76 | 2004-03-18 22:06:36 +0000 | [diff] [blame] | 20 | |
| 21 | .section .icode,"ax",@progbits |
| 22 | |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 23 | #define FULLSPEED /* use burst writing for word aligned destinations */ |
| 24 | .align 2 |
| 25 | .global memcpy |
| Jens Arnold | d036e97 | 2006-02-06 16:00:58 +0000 | [diff] [blame] | 26 | .global __memcpy_fwd_entry |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 27 | .type memcpy,@function |
| Jörg Hohensohn | b61cf76 | 2004-03-18 22:06:36 +0000 | [diff] [blame] | 28 | |
| Linus Nielsen Feltzing | ba80918 | 2004-10-26 05:40:24 +0000 | [diff] [blame] | 29 | /* Copies <length> bytes of data in memory from <source> to <dest> |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 30 | * This version is optimized for speed |
| 31 | * |
| 32 | * arguments: |
| 33 | * (4,%sp) - destination address |
| 34 | * (8,%sp) - source address |
| 35 | * (12,%sp) - length |
| 36 | * |
| 37 | * return value: |
| 38 | * %d0 - destination address (like ANSI version) |
| 39 | * |
| 40 | * register usage: |
| 41 | * %a0 - current source address |
| 42 | * %a1 - current dest address |
| 43 | * %a2 - source end address (in line-copy loops) |
| 44 | * %d0 - data / scratch |
| 45 | * %d1 - source end address (byte and longword copy) / data / scratch |
| 46 | * %d2 - data / scratch |
| 47 | * %d3..%d7 - data |
| 48 | * |
| 49 | * For maximum speed this routine reads and writes whole lines using burst |
| 50 | * move (movem.l) where possible. For byte aligned destinations (long+1 and |
| 51 | * long+3) it writes longwords only. Same goes for word aligned destinations |
| 52 | * if FULLSPEED is undefined. |
| Linus Nielsen Feltzing | ba80918 | 2004-10-26 05:40:24 +0000 | [diff] [blame] | 53 | */ |
| 54 | memcpy: |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 55 | move.l (4,%sp),%a1 /* Destination */ |
| 56 | move.l (8,%sp),%a0 /* Source */ |
| 57 | move.l (12,%sp),%d1 /* Length */ |
| Jens Arnold | d036e97 | 2006-02-06 16:00:58 +0000 | [diff] [blame] | 58 | |
| 59 | __memcpy_fwd_entry: |
| 60 | add.l %a0,%d1 /* %d1 = source end */ |
| Linus Nielsen Feltzing | ba80918 | 2004-10-26 05:40:24 +0000 | [diff] [blame] | 61 | |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 62 | move.l %a0,%d0 |
| 63 | addq.l #7,%d0 |
| 64 | and.l #0xFFFFFFFC,%d0 /* %d0 = first source long bound + 4 */ |
| 65 | cmp.l %d0,%d1 /* at least one aligned longword to copy? */ |
| 66 | blo.w .bytes2_start /* no, jump directly to trailing byte loop */ |
| 67 | |
| 68 | subq.l #4,%d0 /* %d0 = first source long bound */ |
| 69 | cmp.l %a0,%d0 /* any bytes to copy? */ |
| 70 | jls .bytes1_end /* no: skip byte loop */ |
| Linus Nielsen Feltzing | ba80918 | 2004-10-26 05:40:24 +0000 | [diff] [blame] | 71 | |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 72 | /* leading byte loop: copies 0..3 bytes */ |
| 73 | .bytes1_loop: |
| 74 | move.b (%a0)+,(%a1)+ /* copy byte */ |
| 75 | cmp.l %a0,%d0 /* runs %a0 up to first long bound */ |
| 76 | jhi .bytes1_loop |
| Linus Nielsen Feltzing | ba80918 | 2004-10-26 05:40:24 +0000 | [diff] [blame] | 77 | |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 78 | .bytes1_end: |
| 79 | moveq.l #31,%d0 |
| 80 | add.l %a0,%d0 |
| 81 | and.l #0xFFFFFFF0,%d0 /* %d0 = first source line bound + 16 */ |
| 82 | cmp.l %d0,%d1 /* at least one aligned line to copy? */ |
| 83 | blo.w .long_start /* no: jump to longword copy loop */ |
| 84 | |
| 85 | lea.l (-28,%sp),%sp /* free up some registers */ |
| 86 | movem.l %d2-%d7/%a2,(%sp) |
| 87 | |
| 88 | moveq.l #16,%d2 |
| Jens Arnold | d036e97 | 2006-02-06 16:00:58 +0000 | [diff] [blame] | 89 | sub.l %d2,%d0 /* %d0 = first source line bound */ |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 90 | move.l %d1,%a2 /* %a2 = end address */ |
| 91 | lea.l (-15,%a2),%a2 /* adjust end address for loops doing 16 bytes/ pass */ |
| 92 | move.l %a1,%d1 |
| 93 | moveq.l #3,%d2 /* mask */ |
| 94 | and.l %d2,%d1 |
| 95 | jmp.l (2,%pc,%d1.l*4) /* switch (dest_addr & 3) */ |
| 96 | bra.w .lines_do0_start |
| 97 | bra.w .lines_do1_start |
| 98 | bra.w .lines_do2_start |
| 99 | /* bra.w .lines_do3_start implicit */ |
| 100 | |
| 101 | /* byte aligned destination (long + 3): use line burst reads in main loop */ |
| 102 | .lines_do3_start: |
| 103 | moveq.l #24,%d1 /* shift count for shifting by 3 bytes */ |
| 104 | cmp.l %a0,%d0 /* any leading longwords? */ |
| 105 | jhi .lines_do3_head_start /* yes: leading longword copy */ |
| 106 | |
| 107 | movem.l (%a0),%d4-%d7 /* load first line */ |
| 108 | lea.l (16,%a0),%a0 |
| 109 | move.l %d4,%d2 |
| 110 | lsr.l %d1,%d2 /* get high byte of first longword */ |
| 111 | move.b %d2,(%a1)+ /* store byte */ |
| 112 | jra .lines_do3_entry /* jump into main loop */ |
| 113 | |
| 114 | .lines_do3_head_start: |
| 115 | move.l (%a0)+,%d7 /* load first longword */ |
| 116 | move.l %d7,%d2 |
| 117 | lsr.l %d1,%d2 /* get high byte */ |
| 118 | move.b %d2,(%a1)+ /* store byte */ |
| 119 | jra .lines_do3_head_entry /* jump into leading longword loop */ |
| 120 | |
| 121 | .lines_do3_head_loop: |
| 122 | move.l %d7,%d6 /* move old longword away */ |
| 123 | move.l (%a0)+,%d7 /* load new longword */ |
| 124 | move.l %d7,%d2 |
| 125 | lsr.l %d1,%d2 /* get high byte */ |
| 126 | or.l %d2,%d6 /* combine with old lower 3 bytes */ |
| 127 | move.l %d6,(%a1)+ /* store longword */ |
| 128 | .lines_do3_head_entry: |
| 129 | lsl.l #8,%d7 /* shift up lower 3 bytes */ |
| 130 | cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| 131 | jhi .lines_do3_head_loop |
| 132 | |
| 133 | .lines_do3_loop: |
| 134 | move.l %d7,%d3 /* move last longword of old line away */ |
| 135 | movem.l (%a0),%d4-%d7 /* load new line */ |
| 136 | lea.l (16,%a0),%a0 |
| 137 | move.l %d4,%d2 |
| 138 | lsr.l %d1,%d2 /* get high byte of 1st longword */ |
| 139 | or.l %d2,%d3 /* combine with old lower 3 bytes */ |
| 140 | move.l %d3,(%a1)+ /* store longword */ |
| 141 | .lines_do3_entry: |
| 142 | lsl.l #8,%d4 /* shift up lower 3 bytes */ |
| 143 | move.l %d5,%d2 |
| 144 | lsr.l %d1,%d2 /* get high byte of 2nd longword */ |
| 145 | or.l %d2,%d4 /* combine with 1st lower 3 bytes */ |
| 146 | move.l %d4,(%a1)+ /* store longword */ |
| 147 | lsl.l #8,%d5 /* shift up lower 3 bytes */ |
| 148 | move.l %d6,%d2 |
| 149 | lsr.l %d1,%d2 /* get high byte of 3rd longword */ |
| 150 | or.l %d2,%d5 /* combine with 2nd lower 3 bytes */ |
| 151 | move.l %d5,(%a1)+ /* store longword */ |
| 152 | lsl.l #8,%d6 /* shift up lower 3 bytes */ |
| 153 | move.l %d7,%d2 |
| 154 | lsr.l %d1,%d2 /* get high byte of 4th longword */ |
| 155 | or.l %d2,%d6 /* combine with 3rd lower 3 bytes */ |
| 156 | move.l %d6,(%a1)+ /* store longword */ |
| 157 | lsl.l #8,%d7 /* shift up lower 3 bytes */ |
| 158 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 159 | jhi .lines_do3_loop |
| 160 | |
| 161 | lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| 162 | cmp.l %a0,%a2 /* any trailing longwords? */ |
| 163 | jls .lines_do3_tail_end /* no: just store last lower 3 bytes */ |
| 164 | |
| 165 | .lines_do3_tail_loop: |
| 166 | move.l %d7,%d6 /* move old longword away */ |
| 167 | move.l (%a0)+,%d7 /* load new longword */ |
| 168 | move.l %d7,%d2 |
| 169 | lsr.l %d1,%d2 /* get high byte */ |
| 170 | or.l %d2,%d6 /* combine with old lower 3 bytes */ |
| 171 | move.l %d6,(%a1)+ /* store longword */ |
| 172 | lsl.l #8,%d7 /* shift up lower 3 bytes */ |
| 173 | cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| 174 | jhi .lines_do3_tail_loop |
| 175 | |
| 176 | .lines_do3_tail_end: |
| 177 | swap %d7 /* get high word */ |
| 178 | move.w %d7,(%a1)+ /* store word */ |
| 179 | lsr.l %d1,%d7 /* get moved-up low byte */ |
| 180 | move.b %d7,(%a1)+ /* store byte */ |
| 181 | jra .lines_end |
| 182 | |
| 183 | /* byte aligned destination (long + 1): use line burst reads in main loop */ |
| 184 | .lines_do1_start: |
| 185 | moveq.l #24,%d1 /* shift count for shifting by 3 bytes */ |
| 186 | cmp.l %a0,%d0 /* any leading longwords? */ |
| 187 | jhi .lines_do1_head_start /* yes: leading longword copy */ |
| 188 | |
| 189 | movem.l (%a0),%d4-%d7 /* load first line */ |
| 190 | lea.l (16,%a0),%a0 |
| 191 | move.l %d4,%d2 /* first longword, bytes 3210 */ |
| 192 | lsr.l #8,%d2 /* first longword, bytes .321 */ |
| 193 | swap %d2 /* first longword, bytes 21.3 */ |
| 194 | move.b %d2,(%a1)+ /* store byte */ |
| 195 | swap %d2 /* first longword, bytes .321 */ |
| 196 | move.w %d2,(%a1)+ /* store word */ |
| 197 | jra .lines_do1_entry |
| 198 | |
| 199 | .lines_do1_head_start: |
| 200 | move.l (%a0)+,%d7 /* load first longword */ |
| 201 | move.l %d7,%d2 /* first longword, bytes 3210 */ |
| 202 | lsr.l #8,%d2 /* first longword, bytes .321 */ |
| 203 | swap %d2 /* first longword, bytes 21.3 */ |
| 204 | move.b %d2,(%a1)+ /* store byte */ |
| 205 | swap %d2 /* first longword, bytes .321 */ |
| 206 | move.w %d2,(%a1)+ /* store word */ |
| 207 | jra .lines_do1_head_entry |
| 208 | |
| 209 | .lines_do1_head_loop: |
| 210 | move.l %d7,%d6 /* move old longword away */ |
| 211 | move.l (%a0)+,%d7 /* load new longword */ |
| 212 | move.l %d7,%d2 |
| 213 | lsr.l #8,%d2 /* get upper 3 bytes */ |
| 214 | or.l %d2,%d6 /* combine with old low byte */ |
| 215 | move.l %d6,(%a1)+ /* store longword */ |
| 216 | .lines_do1_head_entry: |
| 217 | lsl.l %d1,%d7 /* shift up low byte */ |
| 218 | cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| 219 | jhi .lines_do1_head_loop |
| 220 | |
| 221 | .lines_do1_loop: |
| 222 | move.l %d7,%d3 /* move last longword of old line away */ |
| 223 | movem.l (%a0),%d4-%d7 /* load new line */ |
| 224 | lea.l (16,%a0),%a0 |
| 225 | move.l %d4,%d2 |
| 226 | lsr.l #8,%d2 /* get upper 3 bytes of 1st longword */ |
| 227 | or.l %d2,%d3 /* combine with low byte of old longword */ |
| 228 | move.l %d3,(%a1)+ /* store longword */ |
| 229 | .lines_do1_entry: |
| 230 | lsl.l %d1,%d4 /* shift up low byte */ |
| 231 | move.l %d5,%d2 |
| 232 | lsr.l #8,%d2 /* get upper 3 bytes of 2nd longword */ |
| 233 | or.l %d2,%d4 /* combine with low byte of 1st longword */ |
| 234 | move.l %d4,(%a1)+ /* store longword */ |
| 235 | lsl.l %d1,%d5 /* shift up low byte */ |
| 236 | move.l %d6,%d2 |
| 237 | lsr.l #8,%d2 /* get upper 3 bytes of 3rd longword */ |
| 238 | or.l %d2,%d5 /* combine with low byte of 2nd longword */ |
| 239 | move.l %d5,(%a1)+ /* store longword */ |
| 240 | lsl.l %d1,%d6 /* shift up low byte */ |
| 241 | move.l %d7,%d2 |
| 242 | lsr.l #8,%d2 /* get upper 3 bytes of 4th longword */ |
| 243 | or.l %d2,%d6 /* combine with low byte of 4th longword */ |
| 244 | move.l %d6,(%a1)+ /* store longword */ |
| 245 | lsl.l %d1,%d7 /* shift up low byte */ |
| 246 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 247 | jhi .lines_do1_loop |
| 248 | |
| 249 | lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| 250 | cmp.l %a0,%a2 /* any trailing longwords? */ |
| 251 | jls .lines_do1_tail_end /* no: just store last low byte */ |
| 252 | |
| 253 | .lines_do1_tail_loop: |
| 254 | move.l %d7,%d6 /* move old longword away */ |
| 255 | move.l (%a0)+,%d7 /* load new longword */ |
| 256 | move.l %d7,%d2 |
| 257 | lsr.l #8,%d2 /* get upper 3 bytes */ |
| 258 | or.l %d2,%d6 /* combine with old low byte */ |
| 259 | move.l %d6,(%a1)+ /* store longword */ |
| 260 | lsl.l %d1,%d7 /* shift up low byte */ |
| 261 | cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| 262 | jhi .lines_do1_tail_loop |
| 263 | |
| 264 | .lines_do1_tail_end: |
| 265 | lsr.l %d1,%d7 /* get shifted-up low byte */ |
| 266 | move.b %d7,(%a1)+ /* store byte */ |
| 267 | jra .lines_end |
| 268 | |
| 269 | /* long aligned destination (line + 0/4/8/12): head */ |
| 270 | .lines_do0_head_loop: |
| 271 | move.l (%a0)+,(%a1)+ /* copy longword */ |
| 272 | .lines_do0_start: |
| 273 | cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| 274 | jhi .lines_do0_head_loop |
| 275 | |
| 276 | .lines_do0_head_end: |
| 277 | move.l %a1,%d1 |
| 278 | lsr.l #2,%d1 |
| 279 | moveq.l #3,%d0 /* mask */ |
| 280 | and.l %d0,%d1 |
| 281 | moveq.l #16,%d0 /* address increment for one main loop pass */ |
| 282 | jmp.l (2,%pc,%d1.l*2) /* switch ((dest_addr >> 2) & 3) */ |
| 283 | bra.b .lines_lo0_start |
| 284 | bra.b .lines_lo4_start |
| 285 | bra.b .lines_lo8_start |
| 286 | /* bra.b .lines_lo12_start implicit */ |
| 287 | |
| 288 | /* long aligned destination (line + 12): use line bursts in the loop */ |
| 289 | .lines_lo12_start: |
| 290 | movem.l (%a0),%d4-%d7 /* load first line */ |
| 291 | add.l %d0,%a0 |
| 292 | move.l %d4,(%a1)+ /* store 1st longword */ |
| 293 | cmp.l %a0,%a2 /* any full lines? */ |
| 294 | jls .lines_lo12_end /* no: skip main loop */ |
| 295 | |
| 296 | .lines_lo12_loop: |
| 297 | move.l %d5,%d1 /* move last 3 longwords of old line away */ |
| 298 | move.l %d6,%d2 |
| 299 | move.l %d7,%d3 |
| 300 | movem.l (%a0),%d4-%d7 /* load new line */ |
| 301 | add.l %d0,%a0 |
| 302 | movem.l %d1-%d4,(%a1) /* store line (3 old + 1 new longwords) */ |
| 303 | add.l %d0,%a1 |
| 304 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 305 | jhi .lines_lo12_loop |
| 306 | |
| 307 | /* long aligned destination (line + 0/4/8/12): tail */ |
| 308 | .lines_lo12_end: |
| 309 | move.l %d5,(%a1)+ /* store 3rd last longword */ |
| 310 | .lines_lo8_end: |
| 311 | move.l %d6,(%a1)+ /* store 2nd last longword */ |
| 312 | .lines_lo4_end: |
| 313 | move.l %d7,(%a1)+ /* store last longword */ |
| 314 | .lines_lo0_end: |
| 315 | lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| 316 | cmp.l %a0,%a2 /* any trailing longwords? */ |
| 317 | jls .lines_end /* no: get outta here */ |
| Jens Arnold | d036e97 | 2006-02-06 16:00:58 +0000 | [diff] [blame] | 318 | |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 319 | .lines_do0_tail_loop: |
| 320 | move.l (%a0)+,(%a1)+ /* copy longword */ |
| 321 | cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| 322 | jhi .lines_do0_tail_loop |
| 323 | |
| 324 | jra .lines_end |
| 325 | |
| 326 | /* line aligned destination: use line bursts in the loop */ |
| 327 | .lines_lo0_start: |
| 328 | .lines_lo0_loop: |
| 329 | movem.l (%a0),%d4-%d7 /* load line */ |
| 330 | add.l %d0,%a0 |
| 331 | movem.l %d4-%d7,(%a1) /* store line */ |
| 332 | add.l %d0,%a1 |
| 333 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 334 | jhi .lines_lo0_loop |
| 335 | |
| 336 | jra .lines_lo0_end /* handle trailing longwords */ |
| 337 | |
| 338 | /* long aligned destination (line + 4): use line bursts in the loop */ |
| 339 | .lines_lo4_start: |
| 340 | movem.l (%a0),%d4-%d7 /* load first line */ |
| 341 | add.l %d0,%a0 |
| 342 | move.l %d4,(%a1)+ /* store 1st longword */ |
| 343 | move.l %d5,(%a1)+ /* store 2nd longword */ |
| 344 | move.l %d6,(%a1)+ /* store 3rd longword */ |
| 345 | cmp.l %a0,%a2 /* any full lines? */ |
| 346 | jls .lines_lo4_end /* no: skip main loop */ |
| 347 | |
| 348 | .lines_lo4_loop: |
| 349 | move.l %d7,%d3 /* move last longword of old line away */ |
| 350 | movem.l (%a0),%d4-%d7 /* load new line */ |
| 351 | add.l %d0,%a0 |
| 352 | movem.l %d3-%d6,(%a1) /* store line (1 old + 3 new longwords) */ |
| 353 | add.l %d0,%a1 |
| 354 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 355 | jhi .lines_lo4_loop |
| 356 | |
| 357 | jra .lines_lo4_end /* handle trailing longwords */ |
| 358 | |
| 359 | /* long aligned destination (line + 8): use line bursts in the loop */ |
| 360 | .lines_lo8_start: |
| 361 | movem.l (%a0),%d4-%d7 /* load first line */ |
| 362 | add.l %d0,%a0 |
| 363 | move.l %d4,(%a1)+ /* store 1st longword */ |
| 364 | move.l %d5,(%a1)+ /* store 2nd longword */ |
| 365 | cmp.l %a0,%a2 |
| 366 | jls .lines_lo8_end |
| 367 | |
| 368 | .lines_lo8_loop: |
| 369 | move.l %d6,%d2 /* move last 2 longwords of old line away */ |
| 370 | move.l %d7,%d3 |
| 371 | movem.l (%a0),%d4-%d7 /* load new line */ |
| 372 | add.l %d0,%a0 |
| 373 | movem.l %d2-%d5,(%a1) /* store line (2 old + 2 new longwords) */ |
| 374 | add.l %d0,%a1 |
| 375 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 376 | jhi .lines_lo8_loop |
| 377 | |
| 378 | jra .lines_lo8_end /* handle trailing longwords */ |
| 379 | |
| 380 | #ifdef FULLSPEED |
| 381 | |
| 382 | /* word aligned destination (line + 2/6/10/14): head */ |
| 383 | .lines_do2_start: |
| 384 | cmp.l %a0,%d0 /* any leading longwords? */ |
| 385 | jls .lines_do2_selector /* no: jump to mainloop selector */ |
| 386 | |
| 387 | move.l (%a0)+,%d7 /* load first longword */ |
| 388 | swap %d7 /* swap words */ |
| 389 | move.w %d7,(%a1)+ /* store high word */ |
| 390 | cmp.l %a0,%d0 /* any more longword? */ |
| 391 | jls .lines_do2_head_end /* no: skip head loop */ |
| 392 | |
| 393 | .lines_do2_head_loop: |
| 394 | move.l %d7,%d6 /* move old longword away */ |
| 395 | move.l (%a0)+,%d7 /* load new longword */ |
| 396 | swap %d7 /* swap words */ |
| 397 | move.w %d7,%d6 /* combine high word with old low word */ |
| 398 | move.l %d6,(%a1)+ /* store longword */ |
| 399 | cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| 400 | jhi .lines_do2_head_loop |
| 401 | |
| 402 | .lines_do2_head_end: |
| 403 | swap %d7 /* undo swap */ |
| 404 | move.w %d7,(%a1)+ /* store word */ |
| 405 | |
| 406 | .lines_do2_selector: |
| 407 | move.l %a1,%d1 |
| 408 | lsr.l #2,%d1 |
| 409 | moveq.l #3,%d0 /* mask */ |
| 410 | and.l %d0,%d1 |
| 411 | moveq.l #16,%d0 /* address increment for one main loop pass */ |
| 412 | jmp.l (2,%pc,%d1.l*4) /* switch ((dest_addr >> 2) & 3) */ |
| 413 | bra.w .lines_lo2_start |
| 414 | bra.w .lines_lo6_start |
| 415 | bra.w .lines_lo10_start |
| 416 | /* bra.w .lines_lo14_start implicit */ |
| 417 | |
| 418 | /* word aligned destination (line + 14): use line bursts in the loop */ |
| 419 | .lines_lo14_start: |
| 420 | movem.l (%a0),%d4-%d7 /* load first line */ |
| Jens Arnold | d036e97 | 2006-02-06 16:00:58 +0000 | [diff] [blame] | 421 | add.l %d0,%a0 |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 422 | swap %d4 /* swap words of 1st long */ |
| 423 | move.w %d4,(%a1)+ /* store word */ |
| 424 | jra .lines_lo14_entry /* jump into main loop */ |
| 425 | |
| 426 | .lines_lo14_loop: |
| 427 | move.l %d4,%d0 /* move old line away */ |
| 428 | move.l %d5,%d1 |
| 429 | move.l %d6,%d2 |
| 430 | move.l %d7,%d3 |
| 431 | movem.l (%a0),%d4-%d7 /* load new line */ |
| 432 | lea.l (16,%a0),%a0 |
| 433 | swap %d4 /* swap words of 1st long */ |
| 434 | move.w %d4,%d3 /* combine 1st high word with old low word */ |
| 435 | movem.l %d0-%d3,(%a1) /* store line */ |
| 436 | lea.l (16,%a1),%a1 |
| 437 | .lines_lo14_entry: |
| 438 | swap %d5 /* swap words of 2nd long */ |
| 439 | move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| 440 | swap %d6 /* swap words of 3rd long */ |
| 441 | move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| 442 | swap %d7 /* swap words of 4th long */ |
| 443 | move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| 444 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 445 | jhi .lines_lo14_loop |
| 446 | |
| 447 | /* word aligned destination (line + 2/6/10/14): tail */ |
| 448 | .lines_lo14_end: |
| 449 | move.l %d4,(%a1)+ /* store third last longword */ |
| 450 | .lines_lo10_end: |
| 451 | move.l %d5,(%a1)+ /* store second last longword */ |
| 452 | .lines_lo6_end: |
| 453 | move.l %d6,(%a1)+ /* store last longword */ |
| 454 | .lines_lo2_end: |
| 455 | lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| 456 | cmp.l %a0,%a2 /* any trailing longwords? */ |
| 457 | jls .lines_do2_tail_end /* no: skip tail loop */ |
| 458 | |
| 459 | .lines_do2_tail_loop: |
| 460 | move.l %d7,%d6 /* move old longword away */ |
| 461 | move.l (%a0)+,%d7 /* load new longword */ |
| 462 | swap %d7 /* swap words */ |
| 463 | move.w %d7,%d6 /* combine high word with old low word */ |
| 464 | move.l %d6,(%a1)+ /* store longword */ |
| 465 | cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| 466 | jhi .lines_do2_tail_loop |
| 467 | |
| 468 | .lines_do2_tail_end: |
| 469 | swap %d7 /* undo swap */ |
| 470 | move.w %d7,(%a1)+ /* store last word */ |
| 471 | jra .lines_end |
| 472 | |
| 473 | /* word aligned destination (line + 2): use line bursts in the loop */ |
| 474 | .lines_lo2_start: |
| 475 | movem.l (%a0),%d4-%d7 /* load first line */ |
| 476 | add.l %d0,%a0 |
| 477 | swap %d4 /* swap words of 1st long */ |
| 478 | move.w %d4,(%a1)+ /* store high word */ |
| 479 | swap %d5 /* swap words of 2nd long */ |
| 480 | move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| 481 | swap %d6 /* swap words of 3rd long */ |
| 482 | move.w %d6,%d5 /* combine 3nd high word with 2nd low word */ |
| 483 | swap %d7 /* swap words of 4th long */ |
| 484 | move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| 485 | move.l %d4,(%a1)+ /* store 1st longword */ |
| 486 | move.l %d5,(%a1)+ /* store 2nd longword */ |
| 487 | move.l %d6,(%a1)+ /* store 3rd longword */ |
| 488 | cmp.l %a0,%a2 /* any full lines? */ |
| 489 | jls .lines_lo2_end /* no: skip main loop */ |
| 490 | |
| 491 | .lines_lo2_loop: |
| 492 | move.l %d7,%d3 /* move last longword of old line away */ |
| 493 | movem.l (%a0),%d4-%d7 /* load line */ |
| 494 | add.l %d0,%a0 |
| 495 | swap %d4 /* swap words of 1st long */ |
| 496 | move.w %d4,%d3 /* combine 1st high word with old low word */ |
| 497 | swap %d5 /* swap words of 2nd long */ |
| 498 | move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| 499 | swap %d6 /* swap words of 3rd long */ |
| 500 | move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| 501 | swap %d7 /* swap words of 4th long */ |
| 502 | move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| 503 | movem.l %d3-%d6,(%a1) /* store line */ |
| 504 | add.l %d0,%a1 |
| 505 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 506 | jhi .lines_lo2_loop |
| 507 | |
| 508 | jra .lines_lo2_end /* handle trailing longwords */ |
| 509 | |
| 510 | /* word aligned destination (line + 6): use line bursts in the loop */ |
| 511 | .lines_lo6_start: |
| 512 | movem.l (%a0),%d4-%d7 /* load first line */ |
| 513 | add.l %d0,%a0 |
| 514 | swap %d4 /* swap words of 1st long */ |
| 515 | move.w %d4,(%a1)+ /* store high word */ |
| 516 | swap %d5 /* swap words of 2nd long */ |
| 517 | move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| 518 | swap %d6 /* swap words of 3rd long */ |
| 519 | move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| 520 | move.l %d4,(%a1)+ /* store 1st longword */ |
| 521 | move.l %d5,(%a1)+ /* store 2nd longword */ |
| 522 | jra .lines_lo6_entry /* jump into main loop */ |
| 523 | |
| 524 | .lines_lo6_loop: |
| 525 | move.l %d6,%d2 /* move last 2 longwords of old line away */ |
| 526 | move.l %d7,%d3 |
| 527 | movem.l (%a0),%d4-%d7 /* load line */ |
| 528 | add.l %d0,%a0 |
| 529 | swap %d4 /* swap words of 1st long */ |
| 530 | move.w %d4,%d3 /* combine 1st high word with old low word */ |
| 531 | swap %d5 /* swap words of 2nd long */ |
| 532 | move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| 533 | swap %d6 /* swap words of 3rd long */ |
| 534 | move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| 535 | movem.l %d2-%d5,(%a1) /* store line */ |
| 536 | add.l %d0,%a1 |
| 537 | .lines_lo6_entry: |
| 538 | swap %d7 /* swap words of 4th long */ |
| 539 | move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| 540 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 541 | jhi .lines_lo6_loop |
| 542 | |
| 543 | jra .lines_lo6_end /* handle trailing longwords */ |
| 544 | |
| 545 | /* word aligned destination (line + 10): use line bursts in the loop */ |
| 546 | .lines_lo10_start: |
| 547 | movem.l (%a0),%d4-%d7 /* load first line */ |
| 548 | add.l %d0,%a0 |
| 549 | swap %d4 /* swap words of 1st long */ |
| 550 | move.w %d4,(%a1)+ /* store high word */ |
| 551 | swap %d5 /* swap words of 2nd long */ |
| 552 | move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| 553 | move.l %d4,(%a1)+ /* store 1st longword */ |
| 554 | jra .lines_lo10_entry /* jump into main loop */ |
| 555 | |
| 556 | .lines_lo10_loop: |
| 557 | move.l %d5,%d1 /* move last 3 longwords of old line away */ |
| 558 | move.l %d6,%d2 |
| 559 | move.l %d7,%d3 |
| 560 | movem.l (%a0),%d4-%d7 /* load line */ |
| 561 | add.l %d0,%a0 |
| 562 | swap %d4 /* swap words of 1st long */ |
| 563 | move.w %d4,%d3 /* combine 1st high word with old low word */ |
| 564 | swap %d5 /* swap words of 2nd long */ |
| 565 | move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| 566 | movem.l %d1-%d4,(%a1) /* store line */ |
| 567 | add.l %d0,%a1 |
| 568 | .lines_lo10_entry: |
| 569 | swap %d6 /* swap words of 3rd long */ |
| 570 | move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| 571 | swap %d7 /* swap words of 4th long */ |
| 572 | move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| 573 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 574 | jhi .lines_lo10_loop |
| 575 | |
| 576 | jra .lines_lo10_end /* handle trailing longwords */ |
| 577 | |
| 578 | #else /* !FULLSPEED */ |
| 579 | |
| 580 | /* word aligned destination (long + 2): use line burst reads in the loop */ |
| 581 | .lines_do2_start: |
| 582 | cmp.l %a0,%d0 /* any leading longwords? */ |
| 583 | jhi .lines_do2_head_start /* yes: leading longword copy */ |
| 584 | |
| 585 | movem.l (%a0),%d4-%d7 /* load first line */ |
| 586 | lea.l (16,%a0),%a0 |
| 587 | swap %d4 /* swap words of 1st long */ |
| 588 | move.w %d4,(%a1)+ /* store high word */ |
| 589 | jra .lines_do2_entry /* jump into main loop */ |
| 590 | |
| 591 | .lines_do2_head_start: |
| 592 | move.l (%a0)+,%d7 /* load first longword */ |
| 593 | swap %d7 /* swap words */ |
| 594 | move.w %d7,(%a1)+ /* store high word */ |
| Jens Arnold | d036e97 | 2006-02-06 16:00:58 +0000 | [diff] [blame] | 595 | cmp.l %a0,%d0 /* any full longword? */ |
| Jens Arnold | 83d3dcf | 2005-11-12 23:42:47 +0000 | [diff] [blame] | 596 | jls .lines_do2_loop /* no: skip head loop */ |
| 597 | |
| 598 | .lines_do2_head_loop: |
| 599 | move.l %d7,%d6 /* move old longword away */ |
| 600 | move.l (%a0)+,%d7 /* load new longword */ |
| 601 | swap %d7 /* swap words */ |
| 602 | move.w %d7,%d6 /* combine high word with old low word */ |
| 603 | move.l %d6,(%a1)+ /* store longword */ |
| 604 | cmp.l %a0,%d0 /* runs %a0 up to first line bound */ |
| 605 | jhi .lines_do2_head_loop |
| 606 | |
| 607 | .lines_do2_loop: |
| 608 | move.l %d7,%d3 /* move last longword of old line away */ |
| 609 | movem.l (%a0),%d4-%d7 /* load line */ |
| 610 | lea.l (16,%a0),%a0 |
| 611 | swap %d4 /* swap words of 1st long */ |
| 612 | move.w %d4,%d3 /* combine 1st high word with old low word */ |
| 613 | move.l %d3,(%a1)+ /* store 1st longword */ |
| 614 | .lines_do2_entry: |
| 615 | swap %d5 /* swap words of 2nd long */ |
| 616 | move.w %d5,%d4 /* combine 2nd high word with 1st low word */ |
| 617 | move.l %d4,(%a1)+ /* store 2nd longword */ |
| 618 | swap %d6 /* swap words of 3rd long */ |
| 619 | move.w %d6,%d5 /* combine 3rd high word with 2nd low word */ |
| 620 | move.l %d5,(%a1)+ /* store 3rd longword */ |
| 621 | swap %d7 /* swap words of 4th long */ |
| 622 | move.w %d7,%d6 /* combine 4th high word with 3rd low word */ |
| 623 | move.l %d6,(%a1)+ /* store 4th longword */ |
| 624 | cmp.l %a0,%a2 /* runs %a0 up to last line bound */ |
| 625 | jhi .lines_do2_loop |
| 626 | |
| 627 | .lines_do2_end: |
| 628 | lea.l (12,%a2),%a2 /* readjust end address for doing longwords */ |
| 629 | cmp.l %a0,%a2 /* any trailing longwords? */ |
| 630 | jls .lines_do2_tail_end /* no: skip tail loop */ |
| 631 | |
| 632 | .lines_do2_tail_loop: |
| 633 | move.l %d7,%d6 /* move old longword away */ |
| 634 | move.l (%a0)+,%d7 /* load new longword */ |
| 635 | swap %d7 /* swap words */ |
| 636 | move.w %d7,%d6 /* combine high word with old low word */ |
| 637 | move.l %d6,(%a1)+ /* store longword */ |
| 638 | cmp.l %a0,%a2 /* runs %a0 up to last long bound */ |
| 639 | jhi .lines_do2_tail_loop |
| 640 | |
| 641 | .lines_do2_tail_end: |
| 642 | swap %d7 /* undo swap */ |
| 643 | move.w %d7,(%a1)+ /* store last word */ |
| 644 | /* jra .lines_end implicit */ |
| 645 | |
| 646 | #endif /* !FULLSPEED */ |
| 647 | |
| 648 | .lines_end: |
| 649 | addq.l #3,%a2 /* readjust end address */ |
| 650 | move.l %a2,%d1 /* end address in %d1 again */ |
| 651 | movem.l (%sp),%d2-%d7/%a2 /* restore registers */ |
| 652 | lea.l (28,%sp),%sp |
| 653 | jra .bytes2_start /* jump to trailing byte loop */ |
| 654 | |
| 655 | .long_start: |
| 656 | subq.l #3,%d1 /* adjust end address for doing 4 bytes/ pass */ |
| 657 | |
| 658 | /* longword copy loop - no lines */ |
| 659 | .long_loop: |
| 660 | move.l (%a0)+,(%a1)+ /* copy longword (write can be unaligned) */ |
| 661 | cmp.l %a0,%d1 /* runs %a0 up to last long bound */ |
| 662 | jhi .long_loop |
| 663 | |
| 664 | addq.l #3,%d1 /* readjust end address */ |
| 665 | cmp.l %a0,%d1 /* any bytes left? */ |
| 666 | jls .bytes2_end /* no: skip trailing byte loop */ |
| 667 | |
| 668 | /* trailing byte loop */ |
| 669 | .bytes2_loop: |
| 670 | move.b (%a0)+,(%a1)+ /* copy byte */ |
| 671 | .bytes2_start: |
| 672 | cmp.l %a0,%d1 /* runs %a0 up to end address */ |
| 673 | jhi .bytes2_loop |
| 674 | |
| 675 | .bytes2_end: |
| 676 | move.l (4,%sp),%d0 /* return destination */ |
| 677 | rts |
| 678 | |
| 679 | .end: |
| 680 | .size memcpy,.end-memcpy |