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| 1 @// |
| 2 @// Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. |
| 3 @// |
| 4 @// Use of this source code is governed by a BSD-style license |
| 5 @// that can be found in the LICENSE file in the root of the source |
| 6 @// tree. An additional intellectual property rights grant can be found |
| 7 @// in the file PATENTS. All contributing project authors may |
| 8 @// be found in the AUTHORS file in the root of the source tree. |
| 9 @// |
| 10 @// This file was originally licensed as follows. It has been |
| 11 @// relicensed with permission from the copyright holders. |
| 12 @// |
| 13 |
| 14 @// |
| 15 @// File Name: omxSP_FFTInv_CToC_SC32_Sfs_s.s |
| 16 @// OpenMAX DL: v1.0.2 |
| 17 @// Last Modified Revision: 6675 |
| 18 @// Last Modified Date: Fri, 06 Jul 2007 |
| 19 @// |
| 20 @// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. |
| 21 @// |
| 22 @// |
| 23 @// |
| 24 @// Description: |
| 25 @// Compute an inverse FFT for a complex signal |
| 26 @// |
| 27 |
| 28 |
| 29 @// Include standard headers |
| 30 |
| 31 #include "dl/api/armCOMM_s.h" |
| 32 #include "dl/api/omxtypes_s.h" |
| 33 |
| 34 @// Import symbols required from other files |
| 35 @// (For example tables) |
| 36 |
| 37 .extern armSP_FFTInv_CToC_SC32_Sfs_Radix2_fs_OutOfPlace_unsafe |
| 38 .extern armSP_FFTInv_CToC_SC32_Radix2_fs_OutOfPlace_unsafe |
| 39 .extern armSP_FFTInv_CToC_SC32_Radix4_fs_OutOfPlace_unsafe |
| 40 .extern armSP_FFTInv_CToC_SC32_Radix8_fs_OutOfPlace_unsafe |
| 41 .extern armSP_FFTInv_CToC_SC32_Radix4_OutOfPlace_unsafe |
| 42 .extern armSP_FFTInv_CToC_SC32_Sfs_Radix4_fs_OutOfPlace_unsafe |
| 43 .extern armSP_FFTInv_CToC_SC32_Sfs_Radix8_fs_OutOfPlace_unsafe |
| 44 .extern armSP_FFTInv_CToC_SC32_Sfs_Radix4_OutOfPlace_unsafe |
| 45 .extern armSP_FFTInv_CToC_SC32_Sfs_Radix2_OutOfPlace_unsafe |
| 46 .extern armSP_FFTInv_CToC_SC32_Radix2_OutOfPlace_unsafe |
| 47 |
| 48 @// Set debugging level |
| 49 @//DEBUG_ON SETL {TRUE} |
| 50 |
| 51 |
| 52 |
| 53 @// Guarding implementation by the processor name |
| 54 |
| 55 |
| 56 |
| 57 @// Guarding implementation by the processor name |
| 58 |
| 59 @// Import symbols required from other files |
| 60 @// (For example tables) |
| 61 .extern armSP_FFTInv_CToC_SC32_Radix4_ls_OutOfPlace_unsafe |
| 62 .extern armSP_FFTInv_CToC_SC32_Radix2_ls_OutOfPlace_unsafe |
| 63 .extern armSP_FFTInv_CToC_SC32_Sfs_Radix2_ls_OutOfPlace_unsafe |
| 64 .extern armSP_FFTInv_CToC_SC32_Sfs_Radix4_ls_OutOfPlace_unsafe |
| 65 |
| 66 |
| 67 @//Input Registers |
| 68 |
| 69 #define pSrc r0 |
| 70 #define pDst r1 |
| 71 #define pFFTSpec r2 |
| 72 #define scale r3 |
| 73 |
| 74 |
| 75 @// Output registers |
| 76 #define result r0 |
| 77 |
| 78 @//Local Scratch Registers |
| 79 |
| 80 #define argTwiddle r1 |
| 81 #define argDst r2 |
| 82 #define argScale r4 |
| 83 #define tmpOrder r4 |
| 84 #define pTwiddle r4 |
| 85 #define pOut r5 |
| 86 #define subFFTSize r7 |
| 87 #define subFFTNum r6 |
| 88 #define N r6 |
| 89 #define order r14 |
| 90 #define diff r9 |
| 91 @// Total num of radix stages required to comple the FFT |
| 92 #define count r8 |
| 93 #define x0r r4 |
| 94 #define x0i r5 |
| 95 #define diffMinusOne r2 |
| 96 #define round r3 |
| 97 |
| 98 @// Neon registers |
| 99 |
| 100 #define dX0 D0.S32 |
| 101 #define dShift D1.S32 |
| 102 |
| 103 |
| 104 |
| 105 @// Allocate stack memory required by the function |
| 106 M_ALLOC4 diffOnStack, 4 |
| 107 |
| 108 @// Write function header |
| 109 M_START omxSP_FFTInv_CToC_SC32_Sfs,r11,d15 |
| 110 |
| 111 @ Structure offsets for the FFTSpec |
| 112 .set ARMsFFTSpec_N, 0 |
| 113 .set ARMsFFTSpec_pBitRev, 4 |
| 114 .set ARMsFFTSpec_pTwiddle, 8 |
| 115 .set ARMsFFTSpec_pBuf, 12 |
| 116 |
| 117 @// Define stack arguments |
| 118 |
| 119 @// Read the size from structure and take log |
| 120 LDR N, [pFFTSpec, #ARMsFFTSpec_N] |
| 121 |
| 122 @// Read other structure parameters |
| 123 LDR pTwiddle, [pFFTSpec, #ARMsFFTSpec_pTwiddle] |
| 124 LDR pOut, [pFFTSpec, #ARMsFFTSpec_pBuf] |
| 125 |
| 126 CLZ order,N @// N = 2^order |
| 127 RSB order,order,#31 |
| 128 MOV subFFTSize,#1 |
| 129 @//MOV subFFTNum,N |
| 130 |
| 131 ADD scale,scale,order @// FFTInverse has a final s
caling factor by N |
| 132 |
| 133 CMP order,#3 |
| 134 BGT orderGreaterthan3 @// order > 3 |
| 135 |
| 136 CMP order,#1 |
| 137 BGE orderGreaterthan0 @// order > 0 |
| 138 M_STR scale, diffOnStack,LT @// order = 0 |
| 139 VLD1 dX0,[pSrc] |
| 140 VST1 dX0,[pDst] |
| 141 MOV pSrc,pDst |
| 142 BLT FFTEnd |
| 143 |
| 144 orderGreaterthan0: |
| 145 @// set the buffers appropriately for various orders |
| 146 CMP order,#2 |
| 147 MOVNE argDst,pDst |
| 148 MOVEQ argDst,pOut |
| 149 MOVEQ pOut,pDst @// Pass the first stage des
tination in RN5 |
| 150 MOV argTwiddle,pTwiddle |
| 151 @// Store the scale factor and scale at the end |
| 152 SUB diff,scale,order |
| 153 M_STR diff, diffOnStack |
| 154 BGE orderGreaterthan1 |
| 155 BLLT armSP_FFTInv_CToC_SC32_Sfs_Radix2_fs_OutOfPlace_unsafe @// orde
r = 1 |
| 156 B FFTEnd |
| 157 |
| 158 orderGreaterthan1: |
| 159 MOV tmpOrder,order @// tmpOrder = RN 4 |
| 160 BL armSP_FFTInv_CToC_SC32_Sfs_Radix2_fs_OutOfPlace_unsafe |
| 161 CMP tmpOrder,#2 |
| 162 BLGT armSP_FFTInv_CToC_SC32_Sfs_Radix2_OutOfPlace_unsafe |
| 163 BL armSP_FFTInv_CToC_SC32_Sfs_Radix2_ls_OutOfPlace_unsafe |
| 164 B FFTEnd |
| 165 |
| 166 |
| 167 orderGreaterthan3: |
| 168 @// check scale = 0 or scale = order |
| 169 SUBS diff, scale, order @// scale > order |
| 170 MOVGT scale,order |
| 171 BGE specialScaleCase @// scale = 0 or scale = orde
r |
| 172 CMP scale,#0 |
| 173 BEQ specialScaleCase |
| 174 B generalScaleCase |
| 175 |
| 176 specialScaleCase: @// scale = 0 or sc
ale = order and order >= 2 |
| 177 |
| 178 TST order, #2 @// Set input args to fft st
ages |
| 179 MOVNE argDst,pDst |
| 180 MOVEQ argDst,pOut |
| 181 MOVEQ pOut,pDst @// Pass the first stage des
tination in RN5 |
| 182 MOV argTwiddle,pTwiddle |
| 183 |
| 184 CMP diff,#0 |
| 185 M_STR diff, diffOnStack |
| 186 BGE scaleEqualsOrder |
| 187 |
| 188 @//check for even or odd order |
| 189 @// NOTE: The following combination of BL's would work fine eventhough t
he first |
| 190 @// BL would corrupt the flags. This is because the end of the "grpZeroS
etLoop" loop inside |
| 191 @// armSP_FFTInv_CToC_SC32_Radix4_fs_OutOfPlace_unsafe sets the Z flag t
o EQ |
| 192 |
| 193 TST order,#0x00000001 |
| 194 BLEQ armSP_FFTInv_CToC_SC32_Radix4_fs_OutOfPlace_unsafe |
| 195 BLNE armSP_FFTInv_CToC_SC32_Radix8_fs_OutOfPlace_unsafe |
| 196 |
| 197 CMP subFFTNum,#4 |
| 198 BLT FFTEnd |
| 199 |
| 200 |
| 201 unscaledRadix4Loop: |
| 202 BEQ lastStageUnscaledRadix4 |
| 203 BL armSP_FFTInv_CToC_SC32_Radix4_OutOfPlace_unsafe |
| 204 CMP subFFTNum,#4 |
| 205 B unscaledRadix4Loop |
| 206 |
| 207 lastStageUnscaledRadix4: |
| 208 BL armSP_FFTInv_CToC_SC32_Radix4_ls_OutOfPlace_unsafe |
| 209 B FFTEnd |
| 210 |
| 211 |
| 212 scaleEqualsOrder: |
| 213 @//check for even or odd order |
| 214 @// NOTE: The following combination of BL's would work fine eventhough t
he first |
| 215 @// BL would corrupt the flags. This is because the end of the "grpZeroS
etLoop" loop inside |
| 216 @// armSP_FFTInv_CToC_SC32_Radix4_fs_OutOfPlace_unsafe sets the Z flag t
o EQ |
| 217 |
| 218 TST order,#0x00000001 |
| 219 BLEQ armSP_FFTInv_CToC_SC32_Sfs_Radix4_fs_OutOfPlace_unsafe |
| 220 BLNE armSP_FFTInv_CToC_SC32_Sfs_Radix8_fs_OutOfPlace_unsafe |
| 221 |
| 222 CMP subFFTNum,#4 |
| 223 BLT FFTEnd |
| 224 |
| 225 |
| 226 scaledRadix4Loop: |
| 227 BEQ lastStageScaledRadix4 |
| 228 BL armSP_FFTInv_CToC_SC32_Sfs_Radix4_OutOfPlace_unsafe |
| 229 CMP subFFTNum,#4 |
| 230 B scaledRadix4Loop |
| 231 |
| 232 lastStageScaledRadix4: |
| 233 BL armSP_FFTInv_CToC_SC32_Sfs_Radix4_ls_OutOfPlace_unsafe |
| 234 B FFTEnd |
| 235 |
| 236 generalScaleCase: @// 0 < scale <
order and order >= 2 |
| 237 @// Determine the correct destination buffer |
| 238 SUB diff,order,scale |
| 239 TST diff,#0x01 |
| 240 ADDEQ count,scale,diff,LSR #1 @// count = scale + (order - sca
le)/2 |
| 241 MOVNE count,order |
| 242 TST count,#0x01 @// Is count even or odd ? |
| 243 |
| 244 MOVNE argDst,pDst @// Set input args to fft stages |
| 245 MOVEQ argDst,pOut |
| 246 MOVEQ pOut,pDst @// Pass the first stage destina
tion in RN5 |
| 247 MOV argTwiddle,pTwiddle |
| 248 |
| 249 M_STR diff, diffOnStack |
| 250 |
| 251 MOV argScale,scale @// Put scale in RN4 so as to sa
ve and restore |
| 252 BL armSP_FFTInv_CToC_SC32_Sfs_Radix2_fs_OutOfPlace_unsafe @// s
caled first stage |
| 253 SUBS argScale,argScale,#1 |
| 254 |
| 255 scaledRadix2Loop: |
| 256 BLGT armSP_FFTInv_CToC_SC32_Sfs_Radix2_OutOfPlace_unsafe |
| 257 SUBS argScale,argScale,#1 @// save and restore scale (RN4)
in the scaled stages |
| 258 BGT scaledRadix2Loop |
| 259 |
| 260 |
| 261 M_LDR diff, diffOnStack |
| 262 @//check for even or odd order |
| 263 TST diff,#0x00000001 |
| 264 BEQ generalUnscaledRadix4Loop |
| 265 B unscaledRadix2Loop |
| 266 |
| 267 generalUnscaledRadix4Loop: |
| 268 CMP subFFTNum,#4 |
| 269 BEQ generalLastStageUnscaledRadix4 |
| 270 BL armSP_FFTInv_CToC_SC32_Radix4_OutOfPlace_unsafe |
| 271 B generalUnscaledRadix4Loop |
| 272 |
| 273 generalLastStageUnscaledRadix4: |
| 274 BL armSP_FFTInv_CToC_SC32_Radix4_ls_OutOfPlace_unsafe |
| 275 B End |
| 276 |
| 277 |
| 278 unscaledRadix2Loop: |
| 279 CMP subFFTNum,#2 |
| 280 BEQ generalLastStageUnscaledRadix2 |
| 281 BL armSP_FFTInv_CToC_SC32_Radix2_OutOfPlace_unsafe |
| 282 B unscaledRadix2Loop |
| 283 |
| 284 generalLastStageUnscaledRadix2: |
| 285 BL armSP_FFTInv_CToC_SC32_Radix2_ls_OutOfPlace_unsafe |
| 286 B End |
| 287 |
| 288 |
| 289 FFTEnd: @// Does only the scaling |
| 290 |
| 291 M_LDR diff, diffOnStack |
| 292 CMP diff,#0 |
| 293 BLE End |
| 294 |
| 295 RSB diff,diff,#0 @// to use VRSHL for right s
hift by a variable |
| 296 VDUP dShift,diff |
| 297 |
| 298 scaleFFTData: @// N = subFFTSize ; da
taptr = pDst ; scale = diff |
| 299 VLD1 {dX0},[pSrc] @// pSrc contains pDst pointer |
| 300 SUBS subFFTSize,subFFTSize,#1 |
| 301 VRSHL dX0,dShift |
| 302 VST1 {dX0},[pSrc]! |
| 303 |
| 304 BGT scaleFFTData |
| 305 |
| 306 |
| 307 End: |
| 308 @// Set return value |
| 309 MOV result, #OMX_Sts_NoErr |
| 310 |
| 311 @// Write function tail |
| 312 M_END |
| 313 |
| 314 .end |
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