Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 1 | @ Tremolo library |
Gloria Wang | 2da723a | 2010-03-18 15:56:16 -0700 | [diff] [blame] | 2 | @----------------------------------------------------------------------- |
| 3 | @ Copyright (C) 2002-2009, Xiph.org Foundation |
| 4 | @ Copyright (C) 2010, Robin Watts for Pinknoise Productions Ltd |
| 5 | @ All rights reserved. |
| 6 | |
| 7 | @ Redistribution and use in source and binary forms, with or without |
| 8 | @ modification, are permitted provided that the following conditions |
| 9 | @ are met: |
| 10 | |
| 11 | @ * Redistributions of source code must retain the above copyright |
| 12 | @ notice, this list of conditions and the following disclaimer. |
| 13 | @ * Redistributions in binary form must reproduce the above |
| 14 | @ copyright notice, this list of conditions and the following disclaimer |
| 15 | @ in the documentation and/or other materials provided with the |
| 16 | @ distribution. |
| 17 | @ * Neither the names of the Xiph.org Foundation nor Pinknoise |
| 18 | @ Productions Ltd nor the names of its contributors may be used to |
| 19 | @ endorse or promote products derived from this software without |
| 20 | @ specific prior written permission. |
| 21 | @ |
| 22 | @ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 23 | @ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 24 | @ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 25 | @ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 26 | @ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 27 | @ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 28 | @ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 29 | @ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 30 | @ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 31 | @ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 32 | @ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | @ ---------------------------------------------------------------------- |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 34 | |
| 35 | .text |
| 36 | |
| 37 | .global decode_packed_entry_number |
| 38 | .global decode_packed_entry_number_REALSTART |
| 39 | .global decode_map |
| 40 | .global vorbis_book_decodevv_add |
| 41 | .global _checksum |
| 42 | |
| 43 | .extern oggpack_adv |
| 44 | .extern oggpack_look |
| 45 | .extern oggpack_eop |
| 46 | .extern crc_lookup |
| 47 | |
| 48 | decode_packed_entry_number_REALSTART: |
| 49 | dpen_nobits: |
| 50 | MOV r0,r5 @ r0 = b |
| 51 | MOV r1,#1 @ r1 = 1 |
| 52 | BL oggpack_adv @ oggpack_adv(b,1) /* Force eop */ |
| 53 | duff: |
| 54 | MVN r0,#0 @ return -1 |
| 55 | LDMFD r13!,{r4-r8,r10,PC} |
| 56 | |
| 57 | dpen_readfailed: |
| 58 | SUBS r4,r4,#1 @ r4 = --read |
| 59 | BEQ dpen_nobits |
| 60 | MOV r0,r5 @ r0 = b |
| 61 | MOV r1,r4 @ r1 = read |
| 62 | ADR r14,dpen_read_return |
| 63 | B oggpack_look |
| 64 | |
| 65 | decode_packed_entry_number: |
| 66 | @ r0 = codebook *book |
| 67 | @ r1 = oggpack_buffer *b |
| 68 | STMFD r13!,{r4-r8,r10,r14} |
| 69 | |
| 70 | LDMIA r0,{r4,r6,r7} @ r4 = read = book->max_length |
| 71 | @ r6 = book->dec_table |
| 72 | @ r7 = book->dec_method |
| 73 | MOV r5,r1 @ r5 = b |
| 74 | |
| 75 | MOV r0,r5 @ r0 = b |
| 76 | MOV r1,r4 @ r1 = read |
| 77 | BL oggpack_look |
| 78 | dpen_read_return: |
| 79 | CMP r0,#0 |
| 80 | BLT dpen_readfailed |
| 81 | |
| 82 | @ r0 = lok |
| 83 | @ r4 = read |
| 84 | @ r5 = b |
| 85 | @ r6 = dec_table |
| 86 | @ r7 = dec_method |
| 87 | |
| 88 | CMP r7, #3 |
| 89 | BGT meth4 |
| 90 | BEQ meth3 |
| 91 | CMP r7, #1 |
| 92 | BGT meth2 |
| 93 | BEQ meth1 |
| 94 | meth0: |
| 95 | RSB r1, r4, #0 @ r1 = i-read = 0-read |
| 96 | MOV r7, #0 @ r7 = chase |
| 97 | m0_loop: |
| 98 | MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit |
| 99 | ADC r2, r6, r7, LSL #1 @ r8 = &t[chase*2+C] |
| 100 | LDRB r7, [r2] |
| 101 | ADDS r1, r1, #1 @ r1 = i-read++ (i-read<0 => i<read) |
| 102 | @ stall Xscale |
| 103 | CMPLT r7, #0x80 |
| 104 | BLT m0_loop |
| 105 | AND r7, r7, #0x7F @ r7 = chase |
| 106 | CMP r1, #0 @ if (i-read >= 0) === (i >= read) |
| 107 | MVNGT r7, #0 @ if (i >= read) value to return = -1 |
| 108 | ADD r1, r1, r4 @ r1 = i-read+read+1 = i +1 |
| 109 | MOV r0, r5 @ r0 = b |
| 110 | BL oggpack_adv @ oggpack_adv(b, i+1); |
| 111 | MOV r0, r7 @ return chase |
| 112 | LDMFD r13!,{r4-r8,r10,PC} |
| 113 | |
| 114 | meth1: |
| 115 | @ r0 = lok |
| 116 | @ r4 = read |
| 117 | @ r5 = b |
| 118 | @ r6 = dec_table |
| 119 | RSB r1, r4, #0 @ r1 = i = -read |
| 120 | MOV r10,#0 @ r10= next = 0 |
| 121 | m1_loop: |
| 122 | MOV r7, r10 @ r7 = chase=next |
| 123 | MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit |
| 124 | ADC r8, r6, r7 @ r8 = t+chase+bit |
| 125 | LDRB r10,[r8], -r6 @ r10= next=t[chase+bit] r8=chase+bit |
| 126 | ADDS r1, r1, #1 @ r1 = i++ |
| 127 | @ stall Xscale |
| 128 | CMPLT r10,#0x80 @ if (next & 0x80) == 0 |
| 129 | BLT m1_loop |
| 130 | |
| 131 | ADD r1, r1, r4 @ r1 = i+read |
| 132 | MOV r0, r5 @ r0 = b |
| 133 | BL oggpack_adv @ oggpack_adv(b, i) |
| 134 | |
| 135 | CMP r10,#0x80 |
| 136 | BLT duff |
| 137 | |
| 138 | CMP r8, r7 @ if bit==0 (chase+bit==chase) (sets C) |
| 139 | LDRNEB r14,[r6, r7] @ r14= t[chase] |
| 140 | MOVEQ r14,#128 |
| 141 | ADC r12,r8, r6 @ r12= chase+bit+1+t |
| 142 | LDRB r14,[r12,r14,LSR #7] @ r14= t[chase+bit+1+(!bit || t[chase]0x0x80)] |
| 143 | BIC r10,r10,#0x80 @ r3 = next &= ~0x80 |
| 144 | @ stall Xscale |
| 145 | ORR r0, r14,r10,LSL #8 @ r7 = chase = (next<<8) | r14 |
| 146 | |
| 147 | LDMFD r13!,{r4-r8,r10,PC} |
| 148 | |
| 149 | |
| 150 | meth2: |
| 151 | RSB r1, r4, #0 @ r1 = i-read = 0-read |
| 152 | MOV r7, #0 @ r7 = chase |
| 153 | MOV r6, r6, LSR #1 |
| 154 | m2_loop: |
| 155 | MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit |
| 156 | ADC r2, r6, r7, LSL #1 @ r8 = &t[chase*2+C] |
| 157 | LDRH r7, [r2, r2] |
| 158 | ADDS r1, r1, #1 @ r1 = i-read++ (i-read<0 => i<read) |
| 159 | @ stall Xscale |
| 160 | CMPLT r7, #0x8000 |
| 161 | BLT m2_loop |
| 162 | BIC r7, r7, #0x8000 @ r7 = chase |
| 163 | CMP r1, #0 @ if (i-read >= 0) === (i >= read) |
| 164 | MVNGT r7, #0 @ if (i >= read) value to return = -1 |
| 165 | ADD r1, r1, r4 @ r1 = i-read+read+1 = i +1 |
| 166 | MOV r0, r5 @ r0 = b |
| 167 | BL oggpack_adv @ oggpack_adv(b, i+1); |
| 168 | MOV r0, r7 @ return chase |
| 169 | LDMFD r13!,{r4-r8,r10,PC} |
| 170 | |
| 171 | meth3: |
| 172 | @ r0 = lok |
| 173 | @ r4 = read |
| 174 | @ r5 = b |
| 175 | @ r6 = dec_table |
| 176 | RSB r1, r4, #0 @ r1 = i = -read |
| 177 | MOV r10,#0 @ r10= next = 0 |
| 178 | m3_loop: |
| 179 | MOV r7, r10 @ r7 = chase=next |
| 180 | MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit |
| 181 | ADC r8, r7, #0 @ r8 = chase+bit |
| 182 | MOV r8, r8, LSL #1 @ r8 = (chase+bit)<<1 |
| 183 | LDRH r10,[r6, r8] @ r10= next=t[chase+bit] |
| 184 | ADDS r1, r1, #1 @ r1 = i++ |
| 185 | @ stall Xscale |
| 186 | CMPLT r10,#0x8000 @ if (next & 0x8000) == 0 |
| 187 | BLT m3_loop |
| 188 | |
| 189 | ADD r1, r1, r4 @ r1 = i+read |
| 190 | MOV r0, r5 @ r0 = b |
| 191 | BL oggpack_adv @ oggpack_adv(b, i) |
| 192 | |
| 193 | CMP r10,#0x8000 |
| 194 | BLT duff |
| 195 | |
| 196 | MOV r7, r7, LSL #1 |
| 197 | CMP r8, r7 @ if bit==0 (chase+bit==chase) sets C |
| 198 | LDRNEH r14,[r6, r7] @ r14= t[chase] |
| 199 | MOVEQ r14,#0x8000 |
| 200 | ADC r12,r8, r14,LSR #15 @ r12= 1+((chase+bit)<<1)+(!bit || t[chase]0x0x8000) |
| 201 | ADC r12,r12,r14,LSR #15 @ r12= t + (1+chase+bit+(!bit || t[chase]0x0x8000))<<1 |
| 202 | LDRH r14,[r6, r12] @ r14= t[chase+bit+1 |
| 203 | BIC r10,r10,#0x8000 @ r3 = next &= ~0x8000 |
| 204 | @ stall Xscale |
| 205 | ORR r0, r14,r10,LSL #16 @ r7 = chase = (next<<16) | r14 |
| 206 | |
| 207 | LDMFD r13!,{r4-r8,r10,PC} |
| 208 | |
| 209 | meth4: |
| 210 | RSB r1, r4, #0 @ r1 = i-read = 0-read |
| 211 | MOV r7, #0 @ r7 = chase |
| 212 | m4_loop: |
| 213 | MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit |
| 214 | ADC r2, r7, r7 @ r8 = chase*2+C |
| 215 | LDR r7, [r6, r2, LSL #2] |
| 216 | ADDS r1, r1, #1 @ r1 = i-read++ (i-read<0 => i<read) |
| 217 | @ stall Xscale |
| 218 | CMPLT r7, #0x80000000 |
| 219 | BLT m4_loop |
| 220 | BIC r7, r7, #0x80000000 @ r7 = chase |
| 221 | CMP r1, #0 @ if (i-read >= 0) === (i >= read) |
| 222 | MVNGT r7, #0 @ if (i >= read) value to return = -1 |
| 223 | ADD r1, r1, r4 @ r1 = i-read+read+1 = i +1 |
| 224 | MOV r0, r5 @ r0 = b |
| 225 | BL oggpack_adv @ oggpack_adv(b, i+1); |
| 226 | MOV r0, r7 @ return chase |
| 227 | LDMFD r13!,{r4-r8,r10,PC} |
| 228 | |
| 229 | decode_map: |
| 230 | @ r0 = codebook *s |
| 231 | @ r1 = oggpack_buffer *b |
| 232 | @ r2 = int v |
| 233 | @ r3 = int point |
| 234 | STMFD r13!,{r4-r11,r14} |
| 235 | |
| 236 | MOV r4, r0 @ r4 = s |
| 237 | MOV r5, r1 @ r5 = b |
| 238 | MOV r6, r2 @ r6 = v |
| 239 | MOV r7, r3 @ r7 = point |
| 240 | BL decode_packed_entry_number |
| 241 | MOV r8, r0 |
| 242 | |
| 243 | MOV r0, r5 |
| 244 | BL oggpack_eop |
| 245 | CMP r0, #0 |
| 246 | BNE dm_duff |
| 247 | |
| 248 | @ r4 = s |
| 249 | @ r5 = b |
| 250 | @ r6 = v |
| 251 | @ r7 = point |
| 252 | @ r8 = entry |
| 253 | |
| 254 | LDR r1, [r4,#12] @ r1 = s->dec_type |
| 255 | LDR r2, [r4,#16] @ r2 = s->q_bits |
| 256 | LDR r3, [r4,#20] @ r3 = s->dim |
| 257 | LDR r5, [r4,#24] @ r5 = s->q_delp |
| 258 | LDR r11,[r4,#28] @ r11= s->q_minp |
| 259 | LDR r12,[r4,#32] @ r12= s->q_del = mul |
| 260 | LDR r14,[r4,#36] @ r14= s->q_min |
| 261 | SUBS r11,r7, r11 @ r11= add = point - s->q_minp |
| 262 | |
| 263 | MOVGT r14,r14,ASR r11 @ r14= add = s->q_min >> add (if add >0) |
| 264 | RSBLT r11,r11,#0 |
| 265 | MOVLT r14,r14,LSL r11 @ r14= add = s->q_min << -add (if add < 0) |
| 266 | |
| 267 | SUBS r5, r7, r5 @ r5 = shiftM = point - s->q_delp |
| 268 | LDR r7, [r4,#40] @ r7 = s->q_seq |
| 269 | RSBLT r5, r5, #0 @ if (shiftM<0) r5 =-shiftM |
| 270 | MOVLT r12,r12,LSL r5 @ r12=mul<<-shiftM |
| 271 | MOVLT r5, #0 @ r5 =shiftM = 0 |
| 272 | MOVGT r14,r14,LSL r5 @ add <<= shiftM |
| 273 | |
| 274 | CMP r7,#0 @ seqMask = (s->q_seq?-1:0) |
| 275 | MVNNE r7,#0 |
| 276 | |
| 277 | CMP r1, #2 |
| 278 | BEQ dm2 |
| 279 | BGT dm3 |
| 280 | CMP r1,#0 @ probably never happens |
| 281 | BLE dm_duff |
| 282 | dm1: |
| 283 | @ r1 = s->dec_type |
| 284 | @ r2 = s->q_bits |
| 285 | @ r3 = s->dim |
| 286 | @ r5 = shiftM |
| 287 | @ r6 = v |
| 288 | @ r7 = seqMask |
| 289 | @ r8 = entry |
| 290 | @ r12= mul |
| 291 | @ r14= add |
| 292 | MOV r0, #1 |
| 293 | RSB r0, r0, r0, LSL r2 @ r0 = mask = (1<<s->q_bits)-1 |
| 294 | MOV r11,#0 @ r11= prev = 0 |
| 295 | dm1_loop: |
| 296 | AND r1, r8, r0 @ r1 = v = entry & mask |
| 297 | MLA r1, r12, r1, r14 @ r1 = (add + mul*v) |
| 298 | MOV r8, r8, LSR r2 @ r8 = entry>>s->q_bits |
| 299 | SUBS r3, r3, #1 |
| 300 | ADD r1, r11,r1, ASR r5 @ r1 = v = prev+((add+mul*v)>>shiftM) |
| 301 | AND r11,r1, r7 @ r11= prev = seqMask & v |
| 302 | STR r1, [r6], #4 @ *v++ = v |
| 303 | BGT dm1_loop |
| 304 | |
| 305 | MOV r0, #0 |
| 306 | LDMFD r13!,{r4-r11,PC} |
| 307 | dm2: |
| 308 | @ r1 = s->dec_type |
| 309 | @ r2 = s->q_bits |
| 310 | @ r3 = s->dim |
| 311 | @ r4 = s |
| 312 | @ r5 = shiftM |
| 313 | @ r6 = v |
| 314 | @ r7 = seqMask |
| 315 | @ r8 = entry |
| 316 | @ r12= mul |
| 317 | @ r14= add |
| 318 | LDR r1, [r4,#44] @ r1 = s->q_pack |
| 319 | LDR r4, [r4,#48] @ r4 = s->q_val |
| 320 | MOV r11,#0 @ r11= prev |
| 321 | MOV r0, #1 |
| 322 | RSB r0, r0, r0, LSL r1 @ r8 = mask = (1<<s->q_pack)-1 |
| 323 | CMP r2,#8 |
| 324 | BGT dm2_hword |
| 325 | dm2_loop: |
| 326 | AND r2, r8, r0 @ r2 = entry & mask |
| 327 | LDRB r2, [r4, r2] @ r2 = v = q->val[entry & mask] |
| 328 | MOV r8, r8, LSR r1 @ r8 = entry>>q_pack |
| 329 | MLA r2, r12,r2, r14 @ r2 = (add+mul*v) |
| 330 | SUBS r3, r3, #1 |
| 331 | ADD r2, r11,r2, ASR r5 @ r2 = v = prev+(add+mul*v)>>shiftM |
| 332 | AND r11,r2, r7 @ r11= prev = seqMask & v |
| 333 | STR r2, [r6], #4 @ *v++ = v |
| 334 | BGT dm2_loop |
| 335 | MOV r0, #0 |
| 336 | LDMFD r13!,{r4-r11,PC} |
| 337 | |
| 338 | dm2_hword: |
| 339 | AND r2, r8, r0 @ r2 = entry & mask |
| 340 | MOV r2, r2, LSL #1 @ r2 = 2*r2 |
| 341 | LDRH r2, [r4, r2] @ r2 = v = q->val[entry & mask] |
| 342 | MOV r8, r8, LSR r1 @ r8 = entry>>q_pack |
| 343 | MLA r2, r12,r2, r14 @ r2 = (add+mul*v) |
| 344 | SUBS r3, r3, #1 |
| 345 | ADD r2, r11,r2, ASR r5 @ r2 = v = prev+(add+mul*v)>>shiftM |
| 346 | AND r11,r2, r7 @ r11= prev = seqMask & v |
| 347 | STR r2, [r6], #4 @ *v++ = v |
| 348 | BGT dm2_hword |
| 349 | MOV r0, #0 |
| 350 | LDMFD r13!,{r4-r11,PC} |
| 351 | |
| 352 | dm3: |
| 353 | @ r1 = s->dec_type |
| 354 | @ r2 = s->q_bits |
| 355 | @ r3 = s->dim |
| 356 | @ r4 = s |
| 357 | @ r5 = shiftM |
| 358 | @ r6 = v |
| 359 | @ r7 = seqMask |
| 360 | @ r8 = entry |
| 361 | @ r12= mul |
| 362 | @ r14= add |
| 363 | LDR r1, [r4,#44] @ r1 = s->q_pack |
| 364 | LDR r4, [r4,#52] @ r4 = s->q_val |
| 365 | CMP r2,#8 |
| 366 | MOV r11,#0 @ r11= prev |
| 367 | MLA r4,r1,r8,r4 @ r4 = ptr = s->q_val+entry*s->q_pack |
| 368 | |
| 369 | BGT dm3_hword |
| 370 | dm3_loop: |
| 371 | LDRB r2, [r4], #1 @ r2 = v = *ptr++ |
| 372 | SUBS r3, r3, #1 |
| 373 | MLA r2, r12,r2, r14 @ r2 = (add+mul*v) |
| 374 | ADD r2, r11,r2, ASR r5 @ r2 = v = prev+(add+mul*v)>>shiftM |
| 375 | AND r11,r2, r7 @ r11= prev = seqMask & v |
| 376 | STR r2, [r6], #4 @ *v++ = v |
| 377 | BGT dm3_loop |
| 378 | MOV r0, #0 |
| 379 | LDMFD r13!,{r4-r11,PC} |
| 380 | |
| 381 | dm3_hword: |
| 382 | LDRH r2, [r4], #2 @ r2 = *ptr++ |
| 383 | SUBS r3, r3, #1 |
| 384 | MLA r2, r12,r2, r14 @ r2 = (add+mul*v) |
| 385 | ADD r2, r11,r2, ASR r5 @ r2 = v = prev+(add+mul*v)>>shiftM |
| 386 | AND r11,r2, r7 @ r11= prev = seqMask & v |
| 387 | STR r2, [r6], #4 @ *v++ = v |
| 388 | BGT dm3_hword |
| 389 | MOV r0, #0 |
| 390 | LDMFD r13!,{r4-r11,PC} |
| 391 | |
| 392 | dm_duff: |
| 393 | MVN r0,#0 |
| 394 | LDMFD r13!,{r4-r11,PC} |
| 395 | |
| 396 | vorbis_book_decodevv_add: |
| 397 | @ r0 = codebook *book |
| 398 | @ r1 = ogg_int32_t **a |
| 399 | @ r2 = long offset |
| 400 | @ r3 = int ch |
| 401 | @ <> = b |
| 402 | @ <> = n |
| 403 | @ <> = point |
| 404 | STMFD r13!,{r4-r11,R14} |
| 405 | LDR r7, [r0, #13*4] @ r7 = used_entries |
| 406 | MOV r9, r0 @ r9 = book |
| 407 | MOV r10,r1 @ r10= 0xa[chptr] chptr=0 |
| 408 | MOV r6, r3 @ r6 = ch |
| 409 | ADD r8, r10,r3, LSL #2 @ r8 = 0xa[ch] |
| 410 | MOV r11,r2 @ r11= offset |
| 411 | CMP r7, #0 @ if (used_entries <= 0) |
| 412 | BLE vbdvva_exit @ exit |
| 413 | LDR r5, [r13,#10*4] @ r5 = n |
| 414 | vbdvva_loop1: |
| 415 | @ r5 = n |
| 416 | @ r6 = ch |
| 417 | @ r8 = 0xa[ch] |
| 418 | @ r9 = book |
| 419 | @ r10= 0xa[chptr] |
| 420 | @ r11= offset |
| 421 | MOV r0, r9 @ r0 = book |
| 422 | LDR r1, [r13,# 9*4] @ r1 = b |
| 423 | LDR r2, [r9, #14*4] @ r2 = v = dec_buf |
| 424 | LDR r3, [r13,#11*4] @ r3 = point |
| 425 | BL decode_map |
| 426 | CMP r0, #0 |
| 427 | BNE vbdvva_fail |
| 428 | |
| 429 | LDR r0, [r9, # 5*4] @ r0 = book->dim |
| 430 | LDR r1, [r9, #14*4] @ r1 = v = dec_buf |
| 431 | vbdvva_loop2: |
| 432 | LDR r2, [r10],#4 @ r2 = a[chptr++] |
| 433 | LDR r12,[r1], #4 @ r1 = v[j++] |
| 434 | CMP r10,r8 @ if (chptr == ch) |
| 435 | SUBEQ r10,r10,r6, LSL #2 @ chptr = 0 |
| 436 | LDR r14,[r2, r11,LSL #2]! @ r2 = 0xa[chptr++][i] r14=[r12] |
| 437 | ADDEQ r11,r11,#1 @ i++ |
| 438 | SUBEQ r5, r5, #1 @ n-- |
| 439 | SUBS r0, r0, #1 @ r0-- |
| 440 | ADD r12,r12,r14 @ r12= a[chptr++][i]+ v[j] |
| 441 | STR r12,[r2] @ r12= a[chptr++][i]+=v[j] |
| 442 | BGT vbdvva_loop2 |
| 443 | CMP r5,#0 |
| 444 | BGT vbdvva_loop1 |
| 445 | vbdvva_exit: |
| 446 | MOV r0, #0 @ return 0 |
| 447 | LDMFD r13!,{r4-r11,PC} |
| 448 | vbdvva_fail: |
| 449 | MVN r0, #0 @ return -1 |
| 450 | LDMFD r13!,{r4-r11,PC} |
| 451 | |
| 452 | _checksum: |
| 453 | @ r0 = ogg_reference *or |
| 454 | @ r1 = bytes |
| 455 | STMFD r13!,{r5-r6,r14} |
| 456 | |
Ard Biesheuvel | e96d449 | 2012-08-11 23:47:34 +0200 | [diff] [blame] | 457 | ADR r6,.Lcrc_lookup |
| 458 | LDR r5,[r6] |
| 459 | ADD r5,r6 |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 460 | MOV r14,#0 @ r14= crc_reg = 0 |
| 461 | MOVS r12,r0 |
| 462 | BEQ _cs_end |
| 463 | _cs_loop1: |
| 464 | LDMIA r12,{r0,r2,r3,r12} @ r0 = or->buffer |
| 465 | @ r2 = or->begin |
| 466 | @ r3 = or->length |
| 467 | @ r12= or->next |
| 468 | LDR r0,[r0] @ r0 = or->buffer->data |
| 469 | CMP r1,r3 @ r3 = post = (bytes < or->length ? |
| 470 | MOVLT r3,r1 @ bytes : or->length) |
| 471 | MOVS r6,r3 @ r6 = j = post |
| 472 | BEQ _cs_no_bytes |
| 473 | ADD r0,r0,r2 @ r0 = or->buffer->data + or->begin |
| 474 | _cs_loop2: |
| 475 | LDRB r2, [r0],#1 @ r2 = data[j] |
| 476 | @ stall |
| 477 | @ stall Xscale |
| 478 | EOR r2, r2, r14,LSR #24 @ r2 = (crc_reg>>24)^data[j] |
| 479 | LDR r2, [r5, r2, LSL #2] @ r2 = crc_lkp[(crc_reg>>24)^data[j]] |
| 480 | SUBS r6, r6, #1 @ j-- |
| 481 | @ stall Xscale |
| 482 | EOR r14,r2, r14,LSL #8 @ r14= crc_reg = (crc_reg<<8)^r2 |
| 483 | BGT _cs_loop2 |
| 484 | _cs_no_bytes: |
| 485 | SUBS r1, r1, r3 |
| 486 | CMPNE r12,#0 |
| 487 | BNE _cs_loop1 |
| 488 | _cs_end: |
| 489 | MOV r0,r14 |
| 490 | LDMFD r13!,{r5-r6,PC} |
| 491 | |
Ard Biesheuvel | e96d449 | 2012-08-11 23:47:34 +0200 | [diff] [blame] | 492 | .Lcrc_lookup: |
| 493 | .WORD crc_lookup-.Lcrc_lookup |
| 494 | |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 495 | @ END |