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 | @ full accuracy version |
| 38 | |
| 39 | .global mdct_backwardARM |
| 40 | .global mdct_shift_right |
| 41 | .global mdct_unroll_prelap |
| 42 | .global mdct_unroll_part2 |
| 43 | .global mdct_unroll_part3 |
| 44 | .global mdct_unroll_postlap |
| 45 | |
Ray Essick | ec4b095 | 2020-08-30 20:04:52 -0700 | [diff] [blame] | 46 | .type mdct_backwardARM, %function |
| 47 | .type mdct_shift_right, %function |
| 48 | .type mdct_unroll_prelap, %function |
| 49 | .type mdct_unroll_part2, %function |
| 50 | .type mdct_unroll_part3, %function |
| 51 | .type mdct_unroll_postlap, %function |
| 52 | |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 53 | .extern sincos_lookup0 |
| 54 | .extern sincos_lookup1 |
Ard Biesheuvel | 2773602 | 2014-08-08 08:30:00 +0200 | [diff] [blame] | 55 | .hidden sincos_lookup0 |
| 56 | .hidden sincos_lookup1 |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 57 | |
Elliott Hughes | 7649bf9 | 2021-04-30 09:36:43 -0700 | [diff] [blame] | 58 | @ clang doesn't support ADRL. |
| 59 | @ Workaround based on that at https://bugs.llvm.org/show_bug.cgi?id=24350. |
| 60 | .macro ADRL reg:req, label:req |
| 61 | add \reg, pc, #((\label - .L_adrl_\@) & 0xff00) |
| 62 | add \reg, \reg, #((\label - .L_adrl_\@) - ((\label - .L_adrl_\@) & 0xff00)) |
| 63 | .L_adrl_\@: |
| 64 | .endm |
| 65 | |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 66 | mdct_unroll_prelap: |
| 67 | @ r0 = out |
| 68 | @ r1 = post |
| 69 | @ r2 = r |
| 70 | @ r3 = step |
| 71 | STMFD r13!,{r4-r7,r14} |
| 72 | MVN r4, #0x8000 |
| 73 | MOV r3, r3, LSL #1 |
| 74 | SUB r1, r2, r1 @ r1 = r - post |
| 75 | SUBS r1, r1, #16 @ r1 = r - post - 16 |
| 76 | BLT unroll_over |
| 77 | unroll_loop: |
| 78 | LDMDB r2!,{r5,r6,r7,r12} |
| 79 | |
| 80 | MOV r5, r5, ASR #9 @ r5 = (*--r)>>9 |
| 81 | MOV r6, r6, ASR #9 @ r6 = (*--r)>>9 |
| 82 | MOV r7, r7, ASR #9 @ r7 = (*--r)>>9 |
| 83 | MOV r12,r12,ASR #9 @ r12= (*--r)>>9 |
| 84 | |
| 85 | MOV r14,r12,ASR #15 |
| 86 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 87 | EORNE r12,r4, r14,ASR #31 |
| 88 | STRH r12,[r0], r3 |
| 89 | |
| 90 | MOV r14,r7, ASR #15 |
| 91 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 92 | EORNE r7, r4, r14,ASR #31 |
| 93 | STRH r7, [r0], r3 |
| 94 | |
| 95 | MOV r14,r6, ASR #15 |
| 96 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 97 | EORNE r6, r4, r14,ASR #31 |
| 98 | STRH r6, [r0], r3 |
| 99 | |
| 100 | MOV r14,r5, ASR #15 |
| 101 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 102 | EORNE r5, r4, r14,ASR #31 |
| 103 | STRH r5, [r0], r3 |
| 104 | |
| 105 | SUBS r1, r1, #16 |
| 106 | BGE unroll_loop |
| 107 | |
| 108 | unroll_over: |
| 109 | ADDS r1, r1, #16 |
| 110 | BLE unroll_end |
| 111 | unroll_loop2: |
| 112 | LDR r5,[r2,#-4]! |
| 113 | @ stall |
| 114 | @ stall (Xscale) |
| 115 | MOV r5, r5, ASR #9 @ r5 = (*--r)>>9 |
| 116 | MOV r14,r5, ASR #15 |
| 117 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 118 | EORNE r5, r4, r14,ASR #31 |
| 119 | STRH r5, [r0], r3 |
| 120 | SUBS r1, r1, #4 |
| 121 | BGT unroll_loop2 |
| 122 | unroll_end: |
| 123 | LDMFD r13!,{r4-r7,PC} |
| 124 | |
| 125 | mdct_unroll_postlap: |
| 126 | @ r0 = out |
| 127 | @ r1 = post |
| 128 | @ r2 = l |
| 129 | @ r3 = step |
| 130 | STMFD r13!,{r4-r7,r14} |
| 131 | MVN r4, #0x8000 |
| 132 | MOV r3, r3, LSL #1 |
| 133 | SUB r1, r1, r2 @ r1 = post - l |
| 134 | MOV r1, r1, ASR #1 @ r1 = (post - l)>>1 |
| 135 | SUBS r1, r1, #16 @ r1 = ((post - l)>>1) - 4 |
| 136 | BLT unroll_over3 |
| 137 | unroll_loop3: |
| 138 | LDR r12,[r2],#8 |
| 139 | LDR r7, [r2],#8 |
| 140 | LDR r6, [r2],#8 |
| 141 | LDR r5, [r2],#8 |
| 142 | |
| 143 | RSB r12,r12,#0 |
| 144 | RSB r5, r5, #0 |
| 145 | RSB r6, r6, #0 |
| 146 | RSB r7, r7, #0 |
| 147 | |
| 148 | MOV r12, r12,ASR #9 @ r12= (-*l)>>9 |
| 149 | MOV r5, r5, ASR #9 @ r5 = (-*l)>>9 |
| 150 | MOV r6, r6, ASR #9 @ r6 = (-*l)>>9 |
| 151 | MOV r7, r7, ASR #9 @ r7 = (-*l)>>9 |
| 152 | |
| 153 | MOV r14,r12,ASR #15 |
| 154 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 155 | EORNE r12,r4, r14,ASR #31 |
| 156 | STRH r12,[r0], r3 |
| 157 | |
| 158 | MOV r14,r7, ASR #15 |
| 159 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 160 | EORNE r7, r4, r14,ASR #31 |
| 161 | STRH r7, [r0], r3 |
| 162 | |
| 163 | MOV r14,r6, ASR #15 |
| 164 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 165 | EORNE r6, r4, r14,ASR #31 |
| 166 | STRH r6, [r0], r3 |
| 167 | |
| 168 | MOV r14,r5, ASR #15 |
| 169 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 170 | EORNE r5, r4, r14,ASR #31 |
| 171 | STRH r5, [r0], r3 |
| 172 | |
| 173 | SUBS r1, r1, #16 |
| 174 | BGE unroll_loop3 |
| 175 | |
| 176 | unroll_over3: |
| 177 | ADDS r1, r1, #16 |
| 178 | BLE unroll_over4 |
| 179 | unroll_loop4: |
| 180 | LDR r5,[r2], #8 |
| 181 | @ stall |
| 182 | @ stall (Xscale) |
| 183 | RSB r5, r5, #0 |
| 184 | MOV r5, r5, ASR #9 @ r5 = (-*l)>>9 |
| 185 | MOV r14,r5, ASR #15 |
| 186 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 187 | EORNE r5, r4, r14,ASR #31 |
| 188 | STRH r5, [r0], r3 |
| 189 | SUBS r1, r1, #4 |
| 190 | BGT unroll_loop4 |
| 191 | unroll_over4: |
| 192 | LDMFD r13!,{r4-r7,PC} |
| 193 | |
| 194 | mdct_unroll_part2: |
| 195 | @ r0 = out |
| 196 | @ r1 = post |
| 197 | @ r2 = l |
| 198 | @ r3 = r |
| 199 | @ <> = step |
| 200 | @ <> = wL |
| 201 | @ <> = wR |
| 202 | MOV r12,r13 |
| 203 | STMFD r13!,{r4,r6-r11,r14} |
| 204 | LDMFD r12,{r8,r9,r10} @ r8 = step |
| 205 | @ r9 = wL |
| 206 | @ r10= wR |
| 207 | MVN r4, #0x8000 |
| 208 | MOV r8, r8, LSL #1 |
| 209 | SUBS r1, r3, r1 @ r1 = (r - post) |
| 210 | BLE unroll_over5 |
| 211 | unroll_loop5: |
| 212 | LDR r12,[r2, #-8]! @ r12= *l (but l -= 2 first) |
| 213 | LDR r11,[r9],#4 @ r11= *wL++ |
| 214 | LDR r7, [r3, #-4]! @ r7 = *--r |
| 215 | LDR r6, [r10,#-4]! @ r6 = *--wR |
| 216 | |
| 217 | @ Can save a cycle here, at the cost of 1bit errors in rounding |
| 218 | SMULL r14,r11,r12,r11 @ (r14,r11) = *l * *wL++ |
| 219 | SMULL r14,r6, r7, r6 @ (r14,r6) = *--r * *--wR |
| 220 | ADD r6, r6, r11 |
| 221 | MOV r6, r6, ASR #8 |
| 222 | MOV r14,r6, ASR #15 |
| 223 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 224 | EORNE r6, r4, r14,ASR #31 |
| 225 | STRH r6, [r0], r8 |
| 226 | |
| 227 | SUBS r1, r1, #4 |
| 228 | BGT unroll_loop5 |
| 229 | |
| 230 | unroll_over5: |
| 231 | LDMFD r13!,{r4,r6-r11,PC} |
| 232 | |
| 233 | mdct_unroll_part3: |
| 234 | @ r0 = out |
| 235 | @ r1 = post |
| 236 | @ r2 = l |
| 237 | @ r3 = r |
| 238 | @ <> = step |
| 239 | @ <> = wL |
| 240 | @ <> = wR |
| 241 | MOV r12,r13 |
| 242 | STMFD r13!,{r4,r6-r11,r14} |
| 243 | LDMFD r12,{r8,r9,r10} @ r8 = step |
| 244 | @ r9 = wL |
| 245 | @ r10= wR |
| 246 | MVN r4, #0x8000 |
| 247 | MOV r8, r8, LSL #1 |
| 248 | SUBS r1, r1, r3 @ r1 = (post - r) |
| 249 | BLE unroll_over6 |
| 250 | unroll_loop6: |
| 251 | LDR r12,[r2],#8 @ r12= *l (but l += 2 first) |
| 252 | LDR r11,[r9],#4 @ r11= *wL++ |
| 253 | LDR r7, [r3],#4 @ r7 = *r++ |
| 254 | LDR r6, [r10,#-4]! @ r6 = *--wR |
| 255 | |
| 256 | @ Can save a cycle here, at the cost of 1bit errors in rounding |
| 257 | SMULL r14,r11,r12,r11 @ (r14,r11) = *l * *wL++ |
| 258 | SMULL r14,r6, r7, r6 @ (r14,r6) = *--r * *--wR |
| 259 | SUB r6, r6, r11 |
| 260 | MOV r6, r6, ASR #8 |
| 261 | MOV r14,r6, ASR #15 |
| 262 | TEQ r14,r14,ASR #31 @ if r14==0 || r14==-1 then in range |
| 263 | EORNE r6, r4, r14,ASR #31 |
| 264 | STRH r6, [r0], r8 |
| 265 | |
| 266 | SUBS r1, r1, #4 |
| 267 | BGT unroll_loop6 |
| 268 | |
| 269 | unroll_over6: |
| 270 | LDMFD r13!,{r4,r6-r11,PC} |
| 271 | |
| 272 | mdct_shift_right: |
| 273 | @ r0 = n |
| 274 | @ r1 = in |
| 275 | @ r2 = right |
| 276 | STMFD r13!,{r4-r11,r14} |
| 277 | |
| 278 | MOV r0, r0, LSR #2 @ n >>= 2 |
| 279 | ADD r1, r1, #4 |
| 280 | |
| 281 | SUBS r0, r0, #8 |
| 282 | BLT sr_less_than_8 |
| 283 | sr_loop: |
| 284 | LDR r3, [r1], #8 |
| 285 | LDR r4, [r1], #8 |
| 286 | LDR r5, [r1], #8 |
| 287 | LDR r6, [r1], #8 |
| 288 | LDR r7, [r1], #8 |
| 289 | LDR r8, [r1], #8 |
| 290 | LDR r12,[r1], #8 |
| 291 | LDR r14,[r1], #8 |
| 292 | SUBS r0, r0, #8 |
| 293 | STMIA r2!,{r3,r4,r5,r6,r7,r8,r12,r14} |
| 294 | BGE sr_loop |
| 295 | sr_less_than_8: |
| 296 | ADDS r0, r0, #8 |
| 297 | BEQ sr_end |
| 298 | sr_loop2: |
| 299 | LDR r3, [r1], #8 |
| 300 | SUBS r0, r0, #1 |
| 301 | STR r3, [r2], #4 |
| 302 | BGT sr_loop2 |
| 303 | sr_end: |
| 304 | LDMFD r13!,{r4-r11,PC} |
| 305 | |
| 306 | mdct_backwardARM: |
| 307 | @ r0 = n |
| 308 | @ r1 = in |
| 309 | STMFD r13!,{r4-r11,r14} |
| 310 | |
| 311 | MOV r2,#1<<4 @ r2 = 1<<shift |
| 312 | MOV r3,#13-4 @ r3 = 13-shift |
| 313 | find_shift_loop: |
| 314 | TST r0,r2 @ if (n & (1<<shift)) == 0 |
| 315 | MOV r2,r2,LSL #1 |
| 316 | SUBEQ r3,r3,#1 @ shift-- |
| 317 | BEQ find_shift_loop |
| 318 | MOV r2,#2 |
| 319 | MOV r2,r2,LSL r3 @ r2 = step = 2<<shift |
| 320 | |
| 321 | @ presymmetry |
| 322 | @ r0 = n (a multiple of 4) |
| 323 | @ r1 = in |
| 324 | @ r2 = step |
| 325 | @ r3 = shift |
| 326 | |
| 327 | ADD r4, r1, r0, LSL #1 @ r4 = aX = in+(n>>1) |
| 328 | ADD r14,r1, r0 @ r14= in+(n>>2) |
| 329 | SUB r4, r4, #3*4 @ r4 = aX = in+n2-3 |
Ard Biesheuvel | e96d449 | 2012-08-11 23:47:34 +0200 | [diff] [blame] | 330 | ADRL r7, .Lsincos_lookup |
| 331 | LDR r5, [r7] @ r5 = T=sincos_lookup0 |
| 332 | ADD r5, r7 |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 333 | |
| 334 | presymmetry_loop1: |
| 335 | LDR r7, [r4,#8] @ r6 = s2 = aX[2] |
| 336 | LDR r11,[r5,#4] @ r11= T[1] |
| 337 | LDR r6, [r4] @ r6 = s0 = aX[0] |
| 338 | LDR r10,[r5],r2,LSL #2 @ r10= T[0] T += step |
| 339 | |
| 340 | @ XPROD31(s0, s2, T[0], T[1], 0xaX[0], &ax[2]) |
| 341 | SMULL r8, r9, r7, r11 @ (r8, r9) = s2*T[1] |
| 342 | @ stall |
| 343 | @ stall ? |
| 344 | SMLAL r8, r9, r6, r10 @ (r8, r9) += s0*T[0] |
| 345 | RSB r6, r6, #0 |
| 346 | @ stall ? |
| 347 | SMULL r8, r12,r7, r10 @ (r8, r12) = s2*T[0] |
| 348 | MOV r9, r9, LSL #1 |
| 349 | @ stall ? |
| 350 | SMLAL r8, r12,r6, r11 @ (r8, r12) -= s0*T[1] |
| 351 | STR r9, [r4],#-16 @ aX[0] = r9 |
| 352 | CMP r4,r14 |
| 353 | MOV r12,r12,LSL #1 |
| 354 | STR r12,[r4,#8+16] @ aX[2] = r12 |
| 355 | |
| 356 | BGE presymmetry_loop1 @ while (aX >= in+n4) |
| 357 | |
| 358 | presymmetry_loop2: |
| 359 | LDR r6,[r4] @ r6 = s0 = aX[0] |
| 360 | LDR r10,[r5,#4] @ r10= T[1] |
| 361 | LDR r7,[r4,#8] @ r6 = s2 = aX[2] |
| 362 | LDR r11,[r5],-r2,LSL #2 @ r11= T[0] T -= step |
| 363 | |
| 364 | @ XPROD31(s0, s2, T[1], T[0], 0xaX[0], &ax[2]) |
| 365 | SMULL r8, r9, r6, r10 @ (r8, r9) = s0*T[1] |
| 366 | @ stall |
| 367 | @ stall ? |
| 368 | SMLAL r8, r9, r7, r11 @ (r8, r9) += s2*T[0] |
| 369 | RSB r6, r6, #0 |
| 370 | @ stall ? |
| 371 | SMULL r8, r12,r7, r10 @ (r8, r12) = s2*T[1] |
| 372 | MOV r9, r9, LSL #1 |
| 373 | @ stall ? |
| 374 | SMLAL r8, r12,r6, r11 @ (r8, r12) -= s0*T[0] |
| 375 | STR r9, [r4],#-16 @ aX[0] = r9 |
| 376 | CMP r4,r1 |
| 377 | MOV r12,r12,LSL #1 |
| 378 | STR r12,[r4,#8+16] @ aX[2] = r12 |
| 379 | |
| 380 | BGE presymmetry_loop2 @ while (aX >= in) |
| 381 | |
| 382 | @ r0 = n |
| 383 | @ r1 = in |
| 384 | @ r2 = step |
| 385 | @ r3 = shift |
| 386 | STMFD r13!,{r3} |
Ard Biesheuvel | e96d449 | 2012-08-11 23:47:34 +0200 | [diff] [blame] | 387 | ADRL r4, .Lsincos_lookup |
| 388 | LDR r5, [r4] @ r5 = T=sincos_lookup0 |
| 389 | ADD r5, r4 |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 390 | ADD r4, r1, r0, LSL #1 @ r4 = aX = in+(n>>1) |
| 391 | SUB r4, r4, #4*4 @ r4 = aX = in+(n>>1)-4 |
| 392 | LDR r11,[r5,#4] @ r11= T[1] |
| 393 | LDR r10,[r5],r2, LSL #2 @ r10= T[0] T += step |
| 394 | presymmetry_loop3: |
| 395 | LDR r8,[r1],#16 @ r8 = ro0 = bX[0] |
| 396 | LDR r9,[r1,#8-16] @ r9 = ro2 = bX[2] |
| 397 | LDR r6,[r4] @ r6 = ri0 = aX[0] |
| 398 | |
| 399 | @ XNPROD31( ro2, ro0, T[1], T[0], 0xaX[0], &aX[2] ) |
| 400 | @ aX[0] = (ro2*T[1] - ro0*T[0])>>31 aX[2] = (ro0*T[1] + ro2*T[0])>>31 |
| 401 | SMULL r14,r12,r8, r11 @ (r14,r12) = ro0*T[1] |
| 402 | RSB r8,r8,#0 @ r8 = -ro0 |
| 403 | @ Stall ? |
| 404 | SMLAL r14,r12,r9, r10 @ (r14,r12) += ro2*T[0] |
| 405 | LDR r7,[r4,#8] @ r7 = ri2 = aX[2] |
| 406 | @ Stall ? |
| 407 | SMULL r14,r3, r9, r11 @ (r14,r3) = ro2*T[1] |
| 408 | MOV r12,r12,LSL #1 |
| 409 | LDR r11,[r5,#4] @ r11= T[1] |
| 410 | SMLAL r14,r3, r8, r10 @ (r14,r3) -= ro0*T[0] |
| 411 | LDR r10,[r5],r2, LSL #2 @ r10= T[0] T += step |
| 412 | STR r12,[r4,#8] |
| 413 | MOV r3, r3, LSL #1 |
| 414 | STR r3, [r4],#-16 |
| 415 | |
| 416 | @ XNPROD31( ri2, ri0, T[0], T[1], 0xbX[0], &bX[2] ) |
| 417 | @ bX[0] = (ri2*T[0] - ri0*T[1])>>31 bX[2] = (ri0*T[0] + ri2*T[1])>>31 |
| 418 | SMULL r14,r12,r6, r10 @ (r14,r12) = ri0*T[0] |
| 419 | RSB r6,r6,#0 @ r6 = -ri0 |
| 420 | @ stall ? |
| 421 | SMLAL r14,r12,r7, r11 @ (r14,r12) += ri2*T[1] |
| 422 | @ stall ? |
| 423 | @ stall ? |
| 424 | SMULL r14,r3, r7, r10 @ (r14,r3) = ri2*T[0] |
| 425 | MOV r12,r12,LSL #1 |
| 426 | @ stall ? |
| 427 | SMLAL r14,r3, r6, r11 @ (r14,r3) -= ri0*T[1] |
| 428 | CMP r4,r1 |
| 429 | STR r12,[r1,#8-16] |
| 430 | MOV r3, r3, LSL #1 |
| 431 | STR r3, [r1,#-16] |
| 432 | |
| 433 | BGE presymmetry_loop3 |
| 434 | |
| 435 | SUB r1,r1,r0 @ r1 = in -= n>>2 (i.e. restore in) |
| 436 | |
| 437 | LDR r3,[r13] |
| 438 | STR r2,[r13,#-4]! |
| 439 | |
| 440 | @ mdct_butterflies |
| 441 | @ r0 = n = (points * 2) |
| 442 | @ r1 = in = x |
| 443 | @ r2 = i |
| 444 | @ r3 = shift |
| 445 | STMFD r13!,{r0-r1} |
Ard Biesheuvel | e96d449 | 2012-08-11 23:47:34 +0200 | [diff] [blame] | 446 | ADRL r4, .Lsincos_lookup |
| 447 | LDR r5, [r4] |
| 448 | ADD r5, r4 |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 449 | RSBS r4,r3,#6 @ r4 = stages = 7-shift then --stages |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 450 | BLE no_generics |
| 451 | MOV r14,#4 @ r14= 4 (i=0) |
| 452 | MOV r6, r14,LSL r3 @ r6 = (4<<i)<<shift |
| 453 | mdct_butterflies_loop1: |
| 454 | MOV r0, r0, LSR #1 @ r0 = points>>i = POINTS |
| 455 | MOV r2, r14,LSR #2 @ r2 = (1<<i)-j (j=0) |
| 456 | STMFD r13!,{r4,r14} |
| 457 | mdct_butterflies_loop2: |
| 458 | |
| 459 | @ mdct_butterfly_generic(x+POINTS*j, POINTS, 4<<(i+shift)) |
| 460 | @ mdct_butterfly_generic(r1, r0, r6) |
| 461 | @ r0 = points |
| 462 | @ r1 = x |
| 463 | @ preserve r2 (external loop counter) |
| 464 | @ preserve r3 |
| 465 | @ preserve r4 (external loop counter) |
| 466 | @ r5 = T = sincos_lookup0 |
| 467 | @ r6 = step |
| 468 | @ preserve r14 |
| 469 | |
| 470 | STR r2,[r13,#-4]! @ stack r2 |
| 471 | ADD r1,r1,r0,LSL #1 @ r1 = x2+4 = x + (POINTS>>1) |
| 472 | ADD r7,r1,r0,LSL #1 @ r7 = x1+4 = x + POINTS |
| 473 | ADD r12,r5,#1024*4 @ r12= sincos_lookup0+1024 |
| 474 | |
| 475 | mdct_bufferfly_generic_loop1: |
| 476 | LDMDB r7!,{r2,r3,r8,r11} @ r2 = x1[0] |
| 477 | @ r3 = x1[1] |
| 478 | @ r8 = x1[2] |
| 479 | @ r11= x1[3] x1 -= 4 |
| 480 | LDMDB r1!,{r4,r9,r10,r14} @ r4 = x2[0] |
| 481 | @ r9 = x2[1] |
| 482 | @ r10= x2[2] |
| 483 | @ r14= x2[3] x2 -= 4 |
| 484 | |
| 485 | SUB r2, r2, r3 @ r2 = s0 = x1[0] - x1[1] |
| 486 | ADD r3, r2, r3, LSL #1 @ r3 = x1[0] + x1[1] (-> x1[0]) |
| 487 | SUB r11,r11,r8 @ r11= s1 = x1[3] - x1[2] |
| 488 | ADD r8, r11,r8, LSL #1 @ r8 = x1[3] + x1[2] (-> x1[2]) |
| 489 | SUB r9, r9, r4 @ r9 = s2 = x2[1] - x2[0] |
| 490 | ADD r4, r9, r4, LSL #1 @ r4 = x2[1] + x2[0] (-> x1[1]) |
| 491 | SUB r14,r14,r10 @ r14= s3 = x2[3] - x2[2] |
| 492 | ADD r10,r14,r10,LSL #1 @ r10= x2[3] + x2[2] (-> x1[3]) |
| 493 | STMIA r7,{r3,r4,r8,r10} |
| 494 | |
| 495 | @ r0 = points |
| 496 | @ r1 = x2 |
| 497 | @ r2 = s0 |
| 498 | @ r3 free |
| 499 | @ r4 free |
| 500 | @ r5 = T |
| 501 | @ r6 = step |
| 502 | @ r7 = x1 |
| 503 | @ r8 free |
| 504 | @ r9 = s2 |
| 505 | @ r10 free |
| 506 | @ r11= s1 |
| 507 | @ r12= limit |
| 508 | @ r14= s3 |
| 509 | |
| 510 | LDR r8, [r5,#4] @ r8 = T[1] |
| 511 | LDR r10,[r5],r6,LSL #2 @ r10= T[0] T += step |
| 512 | |
| 513 | @ XPROD31(s1, s0, T[0], T[1], &x2[0], &x2[2]) |
| 514 | @ x2[0] = (s1*T[0] + s0*T[1])>>31 x2[2] = (s0*T[0] - s1*T[1])>>31 |
| 515 | @ stall Xscale |
| 516 | SMULL r4, r3, r2, r8 @ (r4, r3) = s0*T[1] |
| 517 | SMLAL r4, r3, r11,r10 @ (r4, r3) += s1*T[0] |
| 518 | RSB r11,r11,#0 |
| 519 | SMULL r11,r4, r8, r11 @ (r11,r4) = -s1*T[1] |
| 520 | SMLAL r11,r4, r2, r10 @ (r11,r4) += s0*T[0] |
| 521 | MOV r2, r3, LSL #1 @ r2 = r3<<1 = Value for x2[0] |
| 522 | |
| 523 | @ XPROD31(s2, s3, T[0], T[1], &x2[1], &x2[3]) |
| 524 | @ x2[1] = (s2*T[0] + s3*T[1])>>31 x2[3] = (s3*T[0] - s2*T[1])>>31 |
| 525 | SMULL r11,r3, r9, r10 @ (r11,r3) = s2*T[0] |
| 526 | MOV r4, r4, LSL #1 @ r4 = r4<<1 = Value for x2[2] |
| 527 | SMLAL r11,r3, r14,r8 @ (r11,r3) += s3*T[1] |
| 528 | RSB r9, r9, #0 |
| 529 | SMULL r10,r11,r14,r10 @ (r10,r11) = s3*T[0] |
| 530 | MOV r3, r3, LSL #1 @ r3 = r3<<1 = Value for x2[1] |
| 531 | SMLAL r10,r11,r9,r8 @ (r10,r11) -= s2*T[1] |
| 532 | CMP r5, r12 |
| 533 | MOV r11,r11,LSL #1 @ r11= r11<<1 = Value for x2[3] |
| 534 | |
| 535 | STMIA r1,{r2,r3,r4,r11} |
| 536 | |
| 537 | BLT mdct_bufferfly_generic_loop1 |
| 538 | |
| 539 | SUB r12,r12,#1024*4 |
| 540 | mdct_bufferfly_generic_loop2: |
| 541 | LDMDB r7!,{r2,r3,r9,r10} @ r2 = x1[0] |
| 542 | @ r3 = x1[1] |
| 543 | @ r9 = x1[2] |
| 544 | @ r10= x1[3] x1 -= 4 |
| 545 | LDMDB r1!,{r4,r8,r11,r14} @ r4 = x2[0] |
| 546 | @ r8 = x2[1] |
| 547 | @ r11= x2[2] |
| 548 | @ r14= x2[3] x2 -= 4 |
| 549 | |
| 550 | SUB r2, r2, r3 @ r2 = s0 = x1[0] - x1[1] |
| 551 | ADD r3, r2, r3, LSL #1 @ r3 = x1[0] + x1[1] (-> x1[0]) |
| 552 | SUB r9, r9,r10 @ r9 = s1 = x1[2] - x1[3] |
| 553 | ADD r10,r9,r10, LSL #1 @ r10= x1[2] + x1[3] (-> x1[2]) |
| 554 | SUB r4, r4, r8 @ r4 = s2 = x2[0] - x2[1] |
| 555 | ADD r8, r4, r8, LSL #1 @ r8 = x2[0] + x2[1] (-> x1[1]) |
| 556 | SUB r14,r14,r11 @ r14= s3 = x2[3] - x2[2] |
| 557 | ADD r11,r14,r11,LSL #1 @ r11= x2[3] + x2[2] (-> x1[3]) |
| 558 | STMIA r7,{r3,r8,r10,r11} |
| 559 | |
| 560 | @ r0 = points |
| 561 | @ r1 = x2 |
| 562 | @ r2 = s0 |
| 563 | @ r3 free |
| 564 | @ r4 = s2 |
| 565 | @ r5 = T |
| 566 | @ r6 = step |
| 567 | @ r7 = x1 |
| 568 | @ r8 free |
| 569 | @ r9 = s1 |
| 570 | @ r10 free |
| 571 | @ r11 free |
| 572 | @ r12= limit |
| 573 | @ r14= s3 |
| 574 | |
| 575 | LDR r8, [r5,#4] @ r8 = T[1] |
| 576 | LDR r10,[r5],-r6,LSL #2 @ r10= T[0] T -= step |
| 577 | |
| 578 | @ XNPROD31(s0, s1, T[0], T[1], &x2[0], &x2[2]) |
| 579 | @ x2[0] = (s0*T[0] - s1*T[1])>>31 x2[2] = (s1*T[0] + s0*T[1])>>31 |
| 580 | @ stall Xscale |
| 581 | SMULL r3, r11,r2, r8 @ (r3, r11) = s0*T[1] |
| 582 | SMLAL r3, r11,r9, r10 @ (r3, r11) += s1*T[0] |
| 583 | RSB r9, r9, #0 |
| 584 | SMULL r3, r2, r10,r2 @ (r3, r2) = s0*T[0] |
| 585 | SMLAL r3, r2, r9, r8 @ (r3, r2) += -s1*T[1] |
| 586 | MOV r9, r11,LSL #1 @ r9 = r11<<1 = Value for x2[2] |
| 587 | |
| 588 | @ XNPROD31(s3, s2, T[0], T[1], &x2[1], &x2[3]) |
| 589 | @ x2[1] = (s3*T[0] - s2*T[1])>>31 x2[3] = (s2*T[0] + s3*T[1])>>31 |
| 590 | SMULL r3, r11,r4, r10 @ (r3,r11) = s2*T[0] |
| 591 | MOV r2, r2, LSL #1 @ r2 = r2<<1 = Value for x2[0] |
| 592 | SMLAL r3, r11,r14,r8 @ (r3,r11) += s3*T[1] |
| 593 | RSB r4, r4, #0 |
| 594 | SMULL r10,r3,r14,r10 @ (r10,r3) = s3*T[0] |
| 595 | MOV r11,r11,LSL #1 @ r11= r11<<1 = Value for x2[3] |
| 596 | SMLAL r10,r3, r4, r8 @ (r10,r3) -= s2*T[1] |
| 597 | CMP r5, r12 |
| 598 | MOV r3, r3, LSL #1 @ r3 = r3<<1 = Value for x2[1] |
| 599 | |
| 600 | STMIA r1,{r2,r3,r9,r11} |
| 601 | |
| 602 | BGT mdct_bufferfly_generic_loop2 |
| 603 | |
| 604 | LDR r2,[r13],#4 @ unstack r2 |
| 605 | ADD r1, r1, r0, LSL #2 @ r1 = x+POINTS*j |
| 606 | @ stall Xscale |
| 607 | SUBS r2, r2, #1 @ r2-- (j++) |
| 608 | BGT mdct_butterflies_loop2 |
| 609 | |
| 610 | LDMFD r13!,{r4,r14} |
| 611 | |
| 612 | LDR r1,[r13,#4] |
| 613 | |
| 614 | SUBS r4, r4, #1 @ stages-- |
| 615 | MOV r14,r14,LSL #1 @ r14= 4<<i (i++) |
| 616 | MOV r6, r6, LSL #1 @ r6 = step <<= 1 (i++) |
| 617 | BGE mdct_butterflies_loop1 |
| 618 | LDMFD r13,{r0-r1} |
| 619 | no_generics: |
| 620 | @ mdct_butterflies part2 (loop around mdct_bufferfly_32) |
| 621 | @ r0 = points |
| 622 | @ r1 = in |
| 623 | @ r2 = step |
| 624 | @ r3 = shift |
| 625 | |
| 626 | mdct_bufferflies_loop3: |
| 627 | @ mdct_bufferfly_32 |
| 628 | |
| 629 | @ block1 |
| 630 | ADD r4, r1, #16*4 @ r4 = &in[16] |
| 631 | LDMIA r4,{r5,r6,r9,r10} @ r5 = x[16] |
| 632 | @ r6 = x[17] |
| 633 | @ r9 = x[18] |
| 634 | @ r10= x[19] |
| 635 | LDMIA r1,{r7,r8,r11,r12} @ r7 = x[0] |
| 636 | @ r8 = x[1] |
| 637 | @ r11= x[2] |
| 638 | @ r12= x[3] |
| 639 | SUB r5, r5, r6 @ r5 = s0 = x[16] - x[17] |
| 640 | ADD r6, r5, r6, LSL #1 @ r6 = x[16] + x[17] -> x[16] |
| 641 | SUB r9, r9, r10 @ r9 = s1 = x[18] - x[19] |
| 642 | ADD r10,r9, r10,LSL #1 @ r10= x[18] + x[19] -> x[18] |
| 643 | SUB r8, r8, r7 @ r8 = s2 = x[ 1] - x[ 0] |
| 644 | ADD r7, r8, r7, LSL #1 @ r7 = x[ 1] + x[ 0] -> x[17] |
| 645 | SUB r12,r12,r11 @ r12= s3 = x[ 3] - x[ 2] |
| 646 | ADD r11,r12,r11, LSL #1 @ r11= x[ 3] + x[ 2] -> x[19] |
| 647 | STMIA r4!,{r6,r7,r10,r11} |
| 648 | |
| 649 | LDR r6,cPI1_8 |
| 650 | LDR r7,cPI3_8 |
| 651 | |
| 652 | @ XNPROD31( s0, s1, cPI3_8, cPI1_8, &x[ 0], &x[ 2] ) |
| 653 | @ x[0] = s0*cPI3_8 - s1*cPI1_8 x[2] = s1*cPI3_8 + s0*cPI1_8 |
| 654 | @ stall Xscale |
| 655 | SMULL r14,r11,r5, r6 @ (r14,r11) = s0*cPI1_8 |
| 656 | SMLAL r14,r11,r9, r7 @ (r14,r11) += s1*cPI3_8 |
| 657 | RSB r9, r9, #0 |
| 658 | SMULL r14,r5, r7, r5 @ (r14,r5) = s0*cPI3_8 |
| 659 | SMLAL r14,r5, r9, r6 @ (r14,r5) -= s1*cPI1_8 |
| 660 | MOV r11,r11,LSL #1 |
| 661 | MOV r5, r5, LSL #1 |
| 662 | |
| 663 | @ XPROD31 ( s2, s3, cPI1_8, cPI3_8, &x[ 1], &x[ 3] ) |
| 664 | @ x[1] = s2*cPI1_8 + s3*cPI3_8 x[3] = s3*cPI1_8 - s2*cPI3_8 |
| 665 | SMULL r14,r9, r8, r6 @ (r14,r9) = s2*cPI1_8 |
| 666 | SMLAL r14,r9, r12,r7 @ (r14,r9) += s3*cPI3_8 |
| 667 | RSB r8,r8,#0 |
| 668 | SMULL r14,r12,r6, r12 @ (r14,r12) = s3*cPI1_8 |
| 669 | SMLAL r14,r12,r8, r7 @ (r14,r12) -= s2*cPI3_8 |
| 670 | MOV r9, r9, LSL #1 |
| 671 | MOV r12,r12,LSL #1 |
| 672 | STMIA r1!,{r5,r9,r11,r12} |
| 673 | |
| 674 | @ block2 |
| 675 | LDMIA r4,{r5,r6,r9,r10} @ r5 = x[20] |
| 676 | @ r6 = x[21] |
| 677 | @ r9 = x[22] |
| 678 | @ r10= x[23] |
| 679 | LDMIA r1,{r7,r8,r11,r12} @ r7 = x[4] |
| 680 | @ r8 = x[5] |
| 681 | @ r11= x[6] |
| 682 | @ r12= x[7] |
| 683 | SUB r5, r5, r6 @ r5 = s0 = x[20] - x[21] |
| 684 | ADD r6, r5, r6, LSL #1 @ r6 = x[20] + x[21] -> x[20] |
| 685 | SUB r9, r9, r10 @ r9 = s1 = x[22] - x[23] |
| 686 | ADD r10,r9, r10,LSL #1 @ r10= x[22] + x[23] -> x[22] |
| 687 | SUB r8, r8, r7 @ r8 = s2 = x[ 5] - x[ 4] |
| 688 | ADD r7, r8, r7, LSL #1 @ r7 = x[ 5] + x[ 4] -> x[21] |
| 689 | SUB r12,r12,r11 @ r12= s3 = x[ 7] - x[ 6] |
| 690 | ADD r11,r12,r11, LSL #1 @ r11= x[ 7] + x[ 6] -> x[23] |
| 691 | LDR r14,cPI2_8 |
| 692 | STMIA r4!,{r6,r7,r10,r11} |
| 693 | |
| 694 | SUB r5, r5, r9 @ r5 = s0 - s1 |
| 695 | ADD r9, r5, r9, LSL #1 @ r9 = s0 + s1 |
| 696 | SMULL r6, r5, r14,r5 @ (r6,r5) = (s0-s1)*cPI2_8 |
| 697 | SUB r12,r12,r8 @ r12= s3 - s2 |
| 698 | ADD r8, r12,r8, LSL #1 @ r8 = s3 + s2 |
| 699 | |
| 700 | SMULL r6, r8, r14,r8 @ (r6,r8) = (s3+s2)*cPI2_8 |
| 701 | MOV r5, r5, LSL #1 |
| 702 | SMULL r6, r9, r14,r9 @ (r6,r9) = (s0+s1)*cPI2_8 |
| 703 | MOV r8, r8, LSL #1 |
| 704 | SMULL r6, r12,r14,r12 @ (r6,r12) = (s3-s2)*cPI2_8 |
| 705 | MOV r9, r9, LSL #1 |
| 706 | MOV r12,r12,LSL #1 |
| 707 | STMIA r1!,{r5,r8,r9,r12} |
| 708 | |
| 709 | @ block3 |
| 710 | LDMIA r4,{r5,r6,r9,r10} @ r5 = x[24] |
| 711 | @ r6 = x[25] |
| 712 | @ r9 = x[25] |
| 713 | @ r10= x[26] |
| 714 | LDMIA r1,{r7,r8,r11,r12} @ r7 = x[8] |
| 715 | @ r8 = x[9] |
| 716 | @ r11= x[10] |
| 717 | @ r12= x[11] |
| 718 | SUB r5, r5, r6 @ r5 = s0 = x[24] - x[25] |
| 719 | ADD r6, r5, r6, LSL #1 @ r6 = x[24] + x[25] -> x[25] |
| 720 | SUB r9, r9, r10 @ r9 = s1 = x[26] - x[27] |
| 721 | ADD r10,r9, r10,LSL #1 @ r10= x[26] + x[27] -> x[26] |
| 722 | SUB r8, r8, r7 @ r8 = s2 = x[ 9] - x[ 8] |
| 723 | ADD r7, r8, r7, LSL #1 @ r7 = x[ 9] + x[ 8] -> x[25] |
| 724 | SUB r12,r12,r11 @ r12= s3 = x[11] - x[10] |
| 725 | ADD r11,r12,r11, LSL #1 @ r11= x[11] + x[10] -> x[27] |
| 726 | STMIA r4!,{r6,r7,r10,r11} |
| 727 | |
| 728 | LDR r6,cPI3_8 |
| 729 | LDR r7,cPI1_8 |
| 730 | |
| 731 | @ XNPROD31( s0, s1, cPI1_8, cPI3_8, &x[ 8], &x[10] ) |
| 732 | @ x[8] = s0*cPI1_8 - s1*cPI3_8 x[10] = s1*cPI1_8 + s0*cPI3_8 |
| 733 | @ stall Xscale |
| 734 | SMULL r14,r11,r5, r6 @ (r14,r11) = s0*cPI3_8 |
| 735 | SMLAL r14,r11,r9, r7 @ (r14,r11) += s1*cPI1_8 |
| 736 | RSB r9, r9, #0 |
| 737 | SMULL r14,r5, r7, r5 @ (r14,r5) = s0*cPI1_8 |
| 738 | SMLAL r14,r5, r9, r6 @ (r14,r5) -= s1*cPI3_8 |
| 739 | MOV r11,r11,LSL #1 |
| 740 | MOV r5, r5, LSL #1 |
| 741 | |
| 742 | @ XPROD31 ( s2, s3, cPI3_8, cPI1_8, &x[ 9], &x[11] ) |
| 743 | @ x[9] = s2*cPI3_8 + s3*cPI1_8 x[11] = s3*cPI3_8 - s2*cPI1_8 |
| 744 | SMULL r14,r9, r8, r6 @ (r14,r9) = s2*cPI3_8 |
| 745 | SMLAL r14,r9, r12,r7 @ (r14,r9) += s3*cPI1_8 |
| 746 | RSB r8,r8,#0 |
| 747 | SMULL r14,r12,r6, r12 @ (r14,r12) = s3*cPI3_8 |
| 748 | SMLAL r14,r12,r8, r7 @ (r14,r12) -= s2*cPI1_8 |
| 749 | MOV r9, r9, LSL #1 |
| 750 | MOV r12,r12,LSL #1 |
| 751 | STMIA r1!,{r5,r9,r11,r12} |
| 752 | |
| 753 | @ block4 |
| 754 | LDMIA r4,{r5,r6,r10,r11} @ r5 = x[28] |
| 755 | @ r6 = x[29] |
| 756 | @ r10= x[30] |
| 757 | @ r11= x[31] |
| 758 | LDMIA r1,{r8,r9,r12,r14} @ r8 = x[12] |
| 759 | @ r9 = x[13] |
| 760 | @ r12= x[14] |
| 761 | @ r14= x[15] |
| 762 | SUB r5, r5, r6 @ r5 = s0 = x[28] - x[29] |
| 763 | ADD r6, r5, r6, LSL #1 @ r6 = x[28] + x[29] -> x[28] |
| 764 | SUB r7, r14,r12 @ r7 = s3 = x[15] - x[14] |
| 765 | ADD r12,r7, r12, LSL #1 @ r12= x[15] + x[14] -> x[31] |
| 766 | SUB r10,r10,r11 @ r10= s1 = x[30] - x[31] |
| 767 | ADD r11,r10,r11,LSL #1 @ r11= x[30] + x[31] -> x[30] |
| 768 | SUB r14, r8, r9 @ r14= s2 = x[12] - x[13] |
| 769 | ADD r9, r14, r9, LSL #1 @ r9 = x[12] + x[13] -> x[29] |
| 770 | STMIA r4!,{r6,r9,r11,r12} |
| 771 | STMIA r1!,{r5,r7,r10,r14} |
| 772 | |
| 773 | @ mdct_butterfly16 (1st version) |
| 774 | @ block 1 |
| 775 | SUB r1,r1,#16*4 |
| 776 | ADD r4,r1,#8*4 |
| 777 | LDMIA r4,{r5,r6,r9,r10} @ r5 = x[ 8] |
| 778 | @ r6 = x[ 9] |
| 779 | @ r9 = x[10] |
| 780 | @ r10= x[11] |
| 781 | LDMIA r1,{r7,r8,r11,r12} @ r7 = x[0] |
| 782 | @ r8 = x[1] |
| 783 | @ r11= x[2] |
| 784 | @ r12= x[3] |
| 785 | SUB r5, r5, r6 @ r5 = s0 = x[ 8] - x[ 9] |
| 786 | ADD r6, r5, r6, LSL #1 @ r6 = x[ 8] + x[ 9] -> x[ 8] |
| 787 | SUB r9, r9, r10 @ r9 = s1 = x[10] - x[11] |
| 788 | ADD r10,r9, r10,LSL #1 @ r10= x[10] + x[11] -> x[10] |
| 789 | SUB r8, r8, r7 @ r8 = s2 = x[ 1] - x[ 0] |
| 790 | ADD r7, r8, r7, LSL #1 @ r7 = x[ 1] + x[ 0] -> x[ 9] |
| 791 | SUB r12,r12,r11 @ r12= s3 = x[ 3] - x[ 2] |
| 792 | ADD r11,r12,r11, LSL #1 @ r11= x[ 3] + x[ 2] -> x[11] |
| 793 | LDR r14,cPI2_8 |
| 794 | STMIA r4!,{r6,r7,r10,r11} |
| 795 | |
| 796 | SUB r5, r5, r9 @ r5 = s0 - s1 |
| 797 | ADD r9, r5, r9, LSL #1 @ r9 = s0 + s1 |
| 798 | SMULL r6, r5, r14,r5 @ (r6,r5) = (s0-s1)*cPI2_8 |
| 799 | SUB r12,r12,r8 @ r12= s3 - s2 |
| 800 | ADD r8, r12,r8, LSL #1 @ r8 = s3 + s2 |
| 801 | |
| 802 | SMULL r6, r8, r14,r8 @ (r6,r8) = (s3+s2)*cPI2_8 |
| 803 | MOV r5, r5, LSL #1 |
| 804 | SMULL r6, r9, r14,r9 @ (r6,r9) = (s0+s1)*cPI2_8 |
| 805 | MOV r8, r8, LSL #1 |
| 806 | SMULL r6, r12,r14,r12 @ (r6,r12) = (s3-s2)*cPI2_8 |
| 807 | MOV r9, r9, LSL #1 |
| 808 | MOV r12,r12,LSL #1 |
| 809 | STMIA r1!,{r5,r8,r9,r12} |
| 810 | |
| 811 | @ block4 |
| 812 | LDMIA r4,{r5,r6,r9,r10} @ r5 = x[12] |
| 813 | @ r6 = x[13] |
| 814 | @ r9 = x[14] |
| 815 | @ r10= x[15] |
| 816 | LDMIA r1,{r7,r8,r11,r12} @ r7 = x[ 4] |
| 817 | @ r8 = x[ 5] |
| 818 | @ r11= x[ 6] |
| 819 | @ r12= x[ 7] |
| 820 | SUB r14,r7, r8 @ r14= s0 = x[ 4] - x[ 5] |
| 821 | ADD r8, r14,r8, LSL #1 @ r8 = x[ 4] + x[ 5] -> x[13] |
| 822 | SUB r7, r12,r11 @ r7 = s1 = x[ 7] - x[ 6] |
| 823 | ADD r11,r7, r11, LSL #1 @ r11= x[ 7] + x[ 6] -> x[15] |
| 824 | SUB r5, r5, r6 @ r5 = s2 = x[12] - x[13] |
| 825 | ADD r6, r5, r6, LSL #1 @ r6 = x[12] + x[13] -> x[12] |
| 826 | SUB r12,r9, r10 @ r12= s3 = x[14] - x[15] |
| 827 | ADD r10,r12,r10,LSL #1 @ r10= x[14] + x[15] -> x[14] |
| 828 | STMIA r4!,{r6,r8,r10,r11} |
| 829 | STMIA r1!,{r5,r7,r12,r14} |
| 830 | |
| 831 | @ mdct_butterfly_8 |
| 832 | LDMDB r1,{r6,r7,r8,r9,r10,r11,r12,r14} |
| 833 | @ r6 = x[0] |
| 834 | @ r7 = x[1] |
| 835 | @ r8 = x[2] |
| 836 | @ r9 = x[3] |
| 837 | @ r10= x[4] |
| 838 | @ r11= x[5] |
| 839 | @ r12= x[6] |
| 840 | @ r14= x[7] |
| 841 | ADD r6, r6, r7 @ r6 = s0 = x[0] + x[1] |
| 842 | SUB r7, r6, r7, LSL #1 @ r7 = s1 = x[0] - x[1] |
| 843 | ADD r8, r8, r9 @ r8 = s2 = x[2] + x[3] |
| 844 | SUB r9, r8, r9, LSL #1 @ r9 = s3 = x[2] - x[3] |
| 845 | ADD r10,r10,r11 @ r10= s4 = x[4] + x[5] |
| 846 | SUB r11,r10,r11,LSL #1 @ r11= s5 = x[4] - x[5] |
| 847 | ADD r12,r12,r14 @ r12= s6 = x[6] + x[7] |
| 848 | SUB r14,r12,r14,LSL #1 @ r14= s7 = x[6] - x[7] |
| 849 | |
| 850 | ADD r2, r11,r9 @ r2 = x[0] = s5 + s3 |
| 851 | SUB r4, r2, r9, LSL #1 @ r4 = x[2] = s5 - s3 |
| 852 | SUB r3, r14,r7 @ r3 = x[1] = s7 - s1 |
| 853 | ADD r5, r3, r7, LSL #1 @ r5 = x[3] = s7 + s1 |
| 854 | SUB r10,r10,r6 @ r10= x[4] = s4 - s0 |
| 855 | SUB r11,r12,r8 @ r11= x[5] = s6 - s2 |
| 856 | ADD r12,r10,r6, LSL #1 @ r12= x[6] = s4 + s0 |
| 857 | ADD r14,r11,r8, LSL #1 @ r14= x[7] = s6 + s2 |
| 858 | STMDB r1,{r2,r3,r4,r5,r10,r11,r12,r14} |
| 859 | |
| 860 | @ mdct_butterfly_8 |
| 861 | LDMIA r1,{r6,r7,r8,r9,r10,r11,r12,r14} |
| 862 | @ r6 = x[0] |
| 863 | @ r7 = x[1] |
| 864 | @ r8 = x[2] |
| 865 | @ r9 = x[3] |
| 866 | @ r10= x[4] |
| 867 | @ r11= x[5] |
| 868 | @ r12= x[6] |
| 869 | @ r14= x[7] |
| 870 | ADD r6, r6, r7 @ r6 = s0 = x[0] + x[1] |
| 871 | SUB r7, r6, r7, LSL #1 @ r7 = s1 = x[0] - x[1] |
| 872 | ADD r8, r8, r9 @ r8 = s2 = x[2] + x[3] |
| 873 | SUB r9, r8, r9, LSL #1 @ r9 = s3 = x[2] - x[3] |
| 874 | ADD r10,r10,r11 @ r10= s4 = x[4] + x[5] |
| 875 | SUB r11,r10,r11,LSL #1 @ r11= s5 = x[4] - x[5] |
| 876 | ADD r12,r12,r14 @ r12= s6 = x[6] + x[7] |
| 877 | SUB r14,r12,r14,LSL #1 @ r14= s7 = x[6] - x[7] |
| 878 | |
| 879 | ADD r2, r11,r9 @ r2 = x[0] = s5 + s3 |
| 880 | SUB r4, r2, r9, LSL #1 @ r4 = x[2] = s5 - s3 |
| 881 | SUB r3, r14,r7 @ r3 = x[1] = s7 - s1 |
| 882 | ADD r5, r3, r7, LSL #1 @ r5 = x[3] = s7 + s1 |
| 883 | SUB r10,r10,r6 @ r10= x[4] = s4 - s0 |
| 884 | SUB r11,r12,r8 @ r11= x[5] = s6 - s2 |
| 885 | ADD r12,r10,r6, LSL #1 @ r12= x[6] = s4 + s0 |
| 886 | ADD r14,r11,r8, LSL #1 @ r14= x[7] = s6 + s2 |
| 887 | STMIA r1,{r2,r3,r4,r5,r10,r11,r12,r14} |
| 888 | |
| 889 | @ block 2 |
| 890 | ADD r1,r1,#16*4-8*4 |
| 891 | ADD r4,r1,#8*4 |
| 892 | LDMIA r4,{r5,r6,r9,r10} @ r5 = x[ 8] |
| 893 | @ r6 = x[ 9] |
| 894 | @ r9 = x[10] |
| 895 | @ r10= x[11] |
| 896 | LDMIA r1,{r7,r8,r11,r12} @ r7 = x[0] |
| 897 | @ r8 = x[1] |
| 898 | @ r11= x[2] |
| 899 | @ r12= x[3] |
| 900 | SUB r5, r5, r6 @ r5 = s0 = x[ 8] - x[ 9] |
| 901 | ADD r6, r5, r6, LSL #1 @ r6 = x[ 8] + x[ 9] -> x[ 8] |
| 902 | SUB r9, r9, r10 @ r9 = s1 = x[10] - x[11] |
| 903 | ADD r10,r9, r10,LSL #1 @ r10= x[10] + x[11] -> x[10] |
| 904 | SUB r8, r8, r7 @ r8 = s2 = x[ 1] - x[ 0] |
| 905 | ADD r7, r8, r7, LSL #1 @ r7 = x[ 1] + x[ 0] -> x[ 9] |
| 906 | SUB r12,r12,r11 @ r12= s3 = x[ 3] - x[ 2] |
| 907 | ADD r11,r12,r11, LSL #1 @ r11= x[ 3] + x[ 2] -> x[11] |
| 908 | LDR r14,cPI2_8 |
| 909 | STMIA r4!,{r6,r7,r10,r11} |
| 910 | |
| 911 | SUB r5, r5, r9 @ r5 = s0 - s1 |
| 912 | ADD r9, r5, r9, LSL #1 @ r9 = s0 + s1 |
| 913 | SMULL r6, r5, r14,r5 @ (r6,r5) = (s0-s1)*cPI2_8 |
| 914 | SUB r12,r12,r8 @ r12= s3 - s2 |
| 915 | ADD r8, r12,r8, LSL #1 @ r8 = s3 + s2 |
| 916 | |
| 917 | SMULL r6, r8, r14,r8 @ (r6,r8) = (s3+s2)*cPI2_8 |
| 918 | MOV r5, r5, LSL #1 |
| 919 | SMULL r6, r9, r14,r9 @ (r6,r9) = (s0+s1)*cPI2_8 |
| 920 | MOV r8, r8, LSL #1 |
| 921 | SMULL r6, r12,r14,r12 @ (r6,r12) = (s3-s2)*cPI2_8 |
| 922 | MOV r9, r9, LSL #1 |
| 923 | MOV r12,r12,LSL #1 |
| 924 | STMIA r1!,{r5,r8,r9,r12} |
| 925 | |
| 926 | @ block4 |
| 927 | LDMIA r4,{r5,r6,r9,r10} @ r5 = x[12] |
| 928 | @ r6 = x[13] |
| 929 | @ r9 = x[14] |
| 930 | @ r10= x[15] |
| 931 | LDMIA r1,{r7,r8,r11,r12} @ r7 = x[ 4] |
| 932 | @ r8 = x[ 5] |
| 933 | @ r11= x[ 6] |
| 934 | @ r12= x[ 7] |
| 935 | SUB r5, r5, r6 @ r5 = s2 = x[12] - x[13] |
| 936 | ADD r6, r5, r6, LSL #1 @ r6 = x[12] + x[13] -> x[12] |
| 937 | SUB r9, r9, r10 @ r9 = s3 = x[14] - x[15] |
| 938 | ADD r10,r9, r10,LSL #1 @ r10= x[14] + x[15] -> x[14] |
| 939 | SUB r14,r7, r8 @ r14= s0 = x[ 4] - x[ 5] |
| 940 | ADD r8, r14,r8, LSL #1 @ r8 = x[ 4] + x[ 5] -> x[13] |
| 941 | SUB r7, r12,r11 @ r7 = s1 = x[ 7] - x[ 6] |
| 942 | ADD r11,r7, r11, LSL #1 @ r11= x[ 7] + x[ 6] -> x[15] |
| 943 | STMIA r4!,{r6,r8,r10,r11} |
| 944 | STMIA r1!,{r5,r7,r9,r14} |
| 945 | |
| 946 | @ mdct_butterfly_8 |
| 947 | LDMDB r1,{r6,r7,r8,r9,r10,r11,r12,r14} |
| 948 | @ r6 = x[0] |
| 949 | @ r7 = x[1] |
| 950 | @ r8 = x[2] |
| 951 | @ r9 = x[3] |
| 952 | @ r10= x[4] |
| 953 | @ r11= x[5] |
| 954 | @ r12= x[6] |
| 955 | @ r14= x[7] |
| 956 | ADD r6, r6, r7 @ r6 = s0 = x[0] + x[1] |
| 957 | SUB r7, r6, r7, LSL #1 @ r7 = s1 = x[0] - x[1] |
| 958 | ADD r8, r8, r9 @ r8 = s2 = x[2] + x[3] |
| 959 | SUB r9, r8, r9, LSL #1 @ r9 = s3 = x[2] - x[3] |
| 960 | ADD r10,r10,r11 @ r10= s4 = x[4] + x[5] |
| 961 | SUB r11,r10,r11,LSL #1 @ r11= s5 = x[4] - x[5] |
| 962 | ADD r12,r12,r14 @ r12= s6 = x[6] + x[7] |
| 963 | SUB r14,r12,r14,LSL #1 @ r14= s7 = x[6] - x[7] |
| 964 | |
| 965 | ADD r2, r11,r9 @ r2 = x[0] = s5 + s3 |
| 966 | SUB r4, r2, r9, LSL #1 @ r4 = x[2] = s5 - s3 |
| 967 | SUB r3, r14,r7 @ r3 = x[1] = s7 - s1 |
| 968 | ADD r5, r3, r7, LSL #1 @ r5 = x[3] = s7 + s1 |
| 969 | SUB r10,r10,r6 @ r10= x[4] = s4 - s0 |
| 970 | SUB r11,r12,r8 @ r11= x[5] = s6 - s2 |
| 971 | ADD r12,r10,r6, LSL #1 @ r12= x[6] = s4 + s0 |
| 972 | ADD r14,r11,r8, LSL #1 @ r14= x[7] = s6 + s2 |
| 973 | STMDB r1,{r2,r3,r4,r5,r10,r11,r12,r14} |
| 974 | |
| 975 | @ mdct_butterfly_8 |
| 976 | LDMIA r1,{r6,r7,r8,r9,r10,r11,r12,r14} |
| 977 | @ r6 = x[0] |
| 978 | @ r7 = x[1] |
| 979 | @ r8 = x[2] |
| 980 | @ r9 = x[3] |
| 981 | @ r10= x[4] |
| 982 | @ r11= x[5] |
| 983 | @ r12= x[6] |
| 984 | @ r14= x[7] |
| 985 | ADD r6, r6, r7 @ r6 = s0 = x[0] + x[1] |
| 986 | SUB r7, r6, r7, LSL #1 @ r7 = s1 = x[0] - x[1] |
| 987 | ADD r8, r8, r9 @ r8 = s2 = x[2] + x[3] |
| 988 | SUB r9, r8, r9, LSL #1 @ r9 = s3 = x[2] - x[3] |
| 989 | ADD r10,r10,r11 @ r10= s4 = x[4] + x[5] |
| 990 | SUB r11,r10,r11,LSL #1 @ r11= s5 = x[4] - x[5] |
| 991 | ADD r12,r12,r14 @ r12= s6 = x[6] + x[7] |
| 992 | SUB r14,r12,r14,LSL #1 @ r14= s7 = x[6] - x[7] |
| 993 | |
| 994 | ADD r2, r11,r9 @ r2 = x[0] = s5 + s3 |
| 995 | SUB r4, r2, r9, LSL #1 @ r4 = x[2] = s5 - s3 |
| 996 | SUB r3, r14,r7 @ r3 = x[1] = s7 - s1 |
| 997 | ADD r5, r3, r7, LSL #1 @ r5 = x[3] = s7 + s1 |
| 998 | SUB r10,r10,r6 @ r10= x[4] = s4 - s0 |
| 999 | SUB r11,r12,r8 @ r11= x[5] = s6 - s2 |
| 1000 | ADD r12,r10,r6, LSL #1 @ r12= x[6] = s4 + s0 |
| 1001 | ADD r14,r11,r8, LSL #1 @ r14= x[7] = s6 + s2 |
| 1002 | STMIA r1,{r2,r3,r4,r5,r10,r11,r12,r14} |
| 1003 | |
| 1004 | ADD r1,r1,#8*4 |
| 1005 | SUBS r0,r0,#64 |
| 1006 | BGT mdct_bufferflies_loop3 |
| 1007 | |
| 1008 | LDMFD r13,{r0-r3} |
| 1009 | |
| 1010 | mdct_bitreverseARM: |
Gloria Wang | 021523c | 2010-02-17 16:29:17 -0800 | [diff] [blame] | 1011 | @ r0 = points = n |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 1012 | @ r1 = in |
| 1013 | @ r2 = step |
| 1014 | @ r3 = shift |
| 1015 | |
| 1016 | MOV r4, #0 @ r4 = bit = 0 |
| 1017 | ADD r5, r1, r0, LSL #1 @ r5 = w = x + (n>>1) |
| 1018 | ADR r6, bitrev |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 1019 | SUB r5, r5, #8 |
| 1020 | brev_lp: |
| 1021 | LDRB r7, [r6, r4, LSR #6] |
| 1022 | AND r8, r4, #0x3f |
| 1023 | LDRB r8, [r6, r8] |
| 1024 | ADD r4, r4, #1 @ bit++ |
| 1025 | @ stall XScale |
| 1026 | ORR r7, r7, r8, LSL #6 @ r7 = bitrev[bit] |
Gloria Wang | 021523c | 2010-02-17 16:29:17 -0800 | [diff] [blame] | 1027 | MOV r7, r7, LSR r3 |
| 1028 | ADD r9, r1, r7, LSL #2 @ r9 = xx = x + (b>>shift) |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 1029 | CMP r5, r9 @ if (w > xx) |
| 1030 | LDR r10,[r5],#-8 @ r10 = w[0] w -= 2 |
| 1031 | LDRGT r11,[r5,#12] @ r11 = w[1] |
| 1032 | LDRGT r12,[r9] @ r12 = xx[0] |
| 1033 | LDRGT r14,[r9,#4] @ r14 = xx[1] |
| 1034 | STRGT r10,[r9] @ xx[0]= w[0] |
| 1035 | STRGT r11,[r9,#4] @ xx[1]= w[1] |
| 1036 | STRGT r12,[r5,#8] @ w[0] = xx[0] |
| 1037 | STRGT r14,[r5,#12] @ w[1] = xx[1] |
| 1038 | CMP r5,r1 |
| 1039 | BGT brev_lp |
| 1040 | |
| 1041 | @ mdct_step7 |
| 1042 | @ r0 = points |
| 1043 | @ r1 = in |
| 1044 | @ r2 = step |
Gloria Wang | 021523c | 2010-02-17 16:29:17 -0800 | [diff] [blame] | 1045 | @ r3 = shift |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 1046 | |
| 1047 | CMP r2, #4 @ r5 = T = (step>=4) ? |
Ard Biesheuvel | e96d449 | 2012-08-11 23:47:34 +0200 | [diff] [blame] | 1048 | ADR r7, .Lsincos_lookup @ sincos_lookup0 + |
| 1049 | ADDLT r7, #4 @ sincos_lookup1 |
| 1050 | LDR r5, [r7] |
| 1051 | ADD r5, r7 |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 1052 | ADD r7, r1, r0, LSL #1 @ r7 = w1 = x + (n>>1) |
| 1053 | ADDGE r5, r5, r2, LSL #1 @ (step>>1) |
| 1054 | ADD r8, r5, #1024*4 @ r8 = Ttop |
| 1055 | step7_loop1: |
| 1056 | LDR r6, [r1] @ r6 = w0[0] |
| 1057 | LDR r9, [r1,#4] @ r9 = w0[1] |
| 1058 | LDR r10,[r7,#-8]! @ r10= w1[0] w1 -= 2 |
| 1059 | LDR r11,[r7,#4] @ r11= w1[1] |
| 1060 | LDR r14,[r5,#4] @ r14= T[1] |
| 1061 | LDR r12,[r5],r2,LSL #2 @ r12= T[0] T += step |
| 1062 | |
| 1063 | ADD r6, r6, r10 @ r6 = s0 = w0[0] + w1[0] |
| 1064 | SUB r10,r6, r10,LSL #1 @ r10= s1b= w0[0] - w1[0] |
| 1065 | SUB r11,r11,r9 @ r11= s1 = w1[1] - w0[1] |
| 1066 | ADD r9, r11,r9, LSL #1 @ r9 = s0b= w1[1] + w0[1] |
| 1067 | |
| 1068 | @ Can save 1 cycle by using SMULL SMLAL - at the cost of being |
| 1069 | @ 1 off. |
| 1070 | SMULL r0, r3, r6, r14 @ (r0,r3) = s0*T[1] |
| 1071 | SMULL r0, r4, r11,r12 @ (r0,r4) += s1*T[0] = s2 |
| 1072 | ADD r3, r3, r4 |
| 1073 | SMULL r0, r14,r11,r14 @ (r0,r14) = s1*T[1] |
| 1074 | SMULL r0, r12,r6, r12 @ (r0,r12) += s0*T[0] = s3 |
| 1075 | SUB r14,r14,r12 |
| 1076 | |
| 1077 | @ r9 = s0b<<1 |
| 1078 | @ r10= s1b<<1 |
| 1079 | ADD r9, r3, r9, ASR #1 @ r9 = s0b + s2 |
| 1080 | SUB r3, r9, r3, LSL #1 @ r3 = s0b - s2 |
| 1081 | |
| 1082 | SUB r12,r14,r10,ASR #1 @ r12= s3 - s1b |
| 1083 | ADD r10,r14,r10,ASR #1 @ r10= s3 + s1b |
| 1084 | STR r9, [r1],#4 |
| 1085 | STR r10,[r1],#4 @ w0 += 2 |
| 1086 | STR r3, [r7] |
| 1087 | STR r12,[r7,#4] |
| 1088 | |
| 1089 | CMP r5,r8 |
| 1090 | BLT step7_loop1 |
| 1091 | |
| 1092 | step7_loop2: |
| 1093 | LDR r6, [r1] @ r6 = w0[0] |
| 1094 | LDR r9, [r1,#4] @ r9 = w0[1] |
| 1095 | LDR r10,[r7,#-8]! @ r10= w1[0] w1 -= 2 |
| 1096 | LDR r11,[r7,#4] @ r11= w1[1] |
| 1097 | LDR r14,[r5,-r2,LSL #2]! @ r12= T[1] T -= step |
| 1098 | LDR r12,[r5,#4] @ r14= T[0] |
| 1099 | |
| 1100 | ADD r6, r6, r10 @ r6 = s0 = w0[0] + w1[0] |
| 1101 | SUB r10,r6, r10,LSL #1 @ r10= s1b= w0[0] - w1[0] |
| 1102 | SUB r11,r11,r9 @ r11= s1 = w1[1] - w0[1] |
| 1103 | ADD r9, r11,r9, LSL #1 @ r9 = s0b= w1[1] + w0[1] |
| 1104 | |
| 1105 | @ Can save 1 cycle by using SMULL SMLAL - at the cost of being |
| 1106 | @ 1 off. |
| 1107 | SMULL r0, r3, r6, r14 @ (r0,r3) = s0*T[0] |
| 1108 | SMULL r0, r4, r11,r12 @ (r0,r4) += s1*T[1] = s2 |
| 1109 | ADD r3, r3, r4 |
| 1110 | SMULL r0, r14,r11,r14 @ (r0,r14) = s1*T[0] |
| 1111 | SMULL r0, r12,r6, r12 @ (r0,r12) += s0*T[1] = s3 |
| 1112 | SUB r14,r14,r12 |
| 1113 | |
| 1114 | @ r9 = s0b<<1 |
| 1115 | @ r10= s1b<<1 |
| 1116 | ADD r9, r3, r9, ASR #1 @ r9 = s0b + s2 |
| 1117 | SUB r3, r9, r3, LSL #1 @ r3 = s0b - s2 |
| 1118 | |
| 1119 | SUB r12,r14,r10,ASR #1 @ r12= s3 - s1b |
| 1120 | ADD r10,r14,r10,ASR #1 @ r10= s3 + s1b |
| 1121 | STR r9, [r1],#4 |
| 1122 | STR r10,[r1],#4 @ w0 += 2 |
| 1123 | STR r3, [r7] |
| 1124 | STR r12,[r7,#4] |
| 1125 | |
| 1126 | CMP r1,r7 |
| 1127 | BLT step7_loop2 |
| 1128 | |
| 1129 | LDMFD r13!,{r0-r3} |
| 1130 | |
| 1131 | @ r0 = points |
| 1132 | @ r1 = in |
| 1133 | @ r2 = step |
| 1134 | @ r3 = shift |
| 1135 | MOV r2, r2, ASR #2 @ r2 = step >>= 2 |
| 1136 | CMP r2, #0 |
| 1137 | CMPNE r2, #1 |
| 1138 | BEQ mdct_end |
| 1139 | |
| 1140 | @ step > 1 (default case) |
| 1141 | CMP r2, #4 @ r5 = T = (step>=4) ? |
Ard Biesheuvel | e96d449 | 2012-08-11 23:47:34 +0200 | [diff] [blame] | 1142 | ADR r7, .Lsincos_lookup @ sincos_lookup0 + |
| 1143 | ADDLT r7, #4 @ sincos_lookup1 |
| 1144 | LDR r5, [r7] |
| 1145 | ADD r5, r7 |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 1146 | ADD r7, r1, r0, LSL #1 @ r7 = iX = x + (n>>1) |
| 1147 | ADDGE r5, r5, r2, LSL #1 @ (step>>1) |
| 1148 | mdct_step8_default: |
| 1149 | LDR r6, [r1],#4 @ r6 = s0 = x[0] |
| 1150 | LDR r8, [r1],#4 @ r8 = -s1 = x[1] |
| 1151 | LDR r12,[r5,#4] @ r12= T[1] |
| 1152 | LDR r14,[r5],r2,LSL #2 @ r14= T[0] T += step |
| 1153 | RSB r8, r8, #0 @ r8 = s1 |
| 1154 | |
| 1155 | @ XPROD31(s0, s1, T[0], T[1], x, x+1) |
| 1156 | @ x[0] = s0 * T[0] + s1 * T[1] x[1] = s1 * T[0] - s0 * T[1] |
| 1157 | SMULL r9, r10, r8, r12 @ (r9,r10) = s1 * T[1] |
| 1158 | CMP r1, r7 |
| 1159 | SMLAL r9, r10, r6, r14 @ (r9,r10) += s0 * T[0] |
| 1160 | RSB r6, r6, #0 @ r6 = -s0 |
| 1161 | SMULL r9, r11, r8, r14 @ (r9,r11) = s1 * T[0] |
| 1162 | MOV r10,r10,LSL #1 |
| 1163 | SMLAL r9, r11, r6, r12 @ (r9,r11) -= s0 * T[1] |
| 1164 | STR r10,[r1,#-8] |
| 1165 | MOV r11,r11,LSL #1 |
| 1166 | STR r11,[r1,#-4] |
| 1167 | BLT mdct_step8_default |
| 1168 | |
| 1169 | mdct_end: |
| 1170 | MOV r0, r2 |
| 1171 | LDMFD r13!,{r4-r11,PC} |
| 1172 | |
| 1173 | cPI1_8: |
| 1174 | .word 0x7641af3d |
| 1175 | cPI2_8: |
| 1176 | .word 0x5a82799a |
| 1177 | cPI3_8: |
| 1178 | .word 0x30fbc54d |
| 1179 | bitrev: |
| 1180 | .byte 0 |
| 1181 | .byte 32 |
| 1182 | .byte 16 |
| 1183 | .byte 48 |
| 1184 | .byte 8 |
| 1185 | .byte 40 |
| 1186 | .byte 24 |
| 1187 | .byte 56 |
| 1188 | .byte 4 |
| 1189 | .byte 36 |
| 1190 | .byte 20 |
| 1191 | .byte 52 |
| 1192 | .byte 12 |
| 1193 | .byte 44 |
| 1194 | .byte 28 |
| 1195 | .byte 60 |
| 1196 | .byte 2 |
| 1197 | .byte 34 |
| 1198 | .byte 18 |
| 1199 | .byte 50 |
| 1200 | .byte 10 |
| 1201 | .byte 42 |
| 1202 | .byte 26 |
| 1203 | .byte 58 |
| 1204 | .byte 6 |
| 1205 | .byte 38 |
| 1206 | .byte 22 |
| 1207 | .byte 54 |
| 1208 | .byte 14 |
| 1209 | .byte 46 |
| 1210 | .byte 30 |
| 1211 | .byte 62 |
| 1212 | .byte 1 |
| 1213 | .byte 33 |
| 1214 | .byte 17 |
| 1215 | .byte 49 |
| 1216 | .byte 9 |
| 1217 | .byte 41 |
| 1218 | .byte 25 |
| 1219 | .byte 57 |
| 1220 | .byte 5 |
| 1221 | .byte 37 |
| 1222 | .byte 21 |
| 1223 | .byte 53 |
| 1224 | .byte 13 |
| 1225 | .byte 45 |
| 1226 | .byte 29 |
| 1227 | .byte 61 |
| 1228 | .byte 3 |
| 1229 | .byte 35 |
| 1230 | .byte 19 |
| 1231 | .byte 51 |
| 1232 | .byte 11 |
| 1233 | .byte 43 |
| 1234 | .byte 27 |
| 1235 | .byte 59 |
| 1236 | .byte 7 |
| 1237 | .byte 39 |
| 1238 | .byte 23 |
| 1239 | .byte 55 |
| 1240 | .byte 15 |
| 1241 | .byte 47 |
| 1242 | .byte 31 |
| 1243 | .byte 63 |
| 1244 | |
Ard Biesheuvel | e96d449 | 2012-08-11 23:47:34 +0200 | [diff] [blame] | 1245 | .Lsincos_lookup: |
| 1246 | .word sincos_lookup0-.Lsincos_lookup |
| 1247 | .word sincos_lookup1-(.Lsincos_lookup+4) |
| 1248 | |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 1249 | @ END |