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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: armSP_FFT_CToC_SC32_Radix4_fs_unsafe_s.s |
| 16 @// OpenMAX DL: v1.0.2 |
| 17 @// Last Modified Revision: 7767 |
| 18 @// Last Modified Date: Thu, 27 Sep 2007 |
| 19 @// |
| 20 @// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. |
| 21 @// |
| 22 @// |
| 23 @// |
| 24 @// Description: |
| 25 @// Compute a first stage Radix 4 FFT stage for a N point complex signal |
| 26 @// |
| 27 |
| 28 |
| 29 |
| 30 @// Include standard headers |
| 31 |
| 32 #include "dl/api/armCOMM_s.h" |
| 33 #include "dl/api/omxtypes_s.h" |
| 34 |
| 35 @// Import symbols required from other files |
| 36 @// (For example tables) |
| 37 |
| 38 |
| 39 |
| 40 |
| 41 @// Set debugging level |
| 42 @//DEBUG_ON SETL {TRUE} |
| 43 |
| 44 |
| 45 |
| 46 @// Guarding implementation by the processor name |
| 47 |
| 48 |
| 49 |
| 50 @// Guarding implementation by the processor name |
| 51 |
| 52 |
| 53 @//Input Registers |
| 54 |
| 55 #define pSrc r0 |
| 56 #define pDst r2 |
| 57 #define pTwiddle r1 |
| 58 #define pPingPongBuf r5 |
| 59 #define subFFTNum r6 |
| 60 #define subFFTSize r7 |
| 61 |
| 62 |
| 63 @//Output Registers |
| 64 |
| 65 |
| 66 @//Local Scratch Registers |
| 67 |
| 68 #define grpSize r3 |
| 69 @// Reuse grpSize as setCount |
| 70 #define setCount r3 |
| 71 #define pointStep r4 |
| 72 #define outPointStep r4 |
| 73 #define setStep r8 |
| 74 #define step1 r9 |
| 75 #define step3 r10 |
| 76 |
| 77 @// Neon Registers |
| 78 |
| 79 #define dXr0 D0.S32 |
| 80 #define dXi0 D1.S32 |
| 81 #define dXr1 D2.S32 |
| 82 #define dXi1 D3.S32 |
| 83 #define dXr2 D4.S32 |
| 84 #define dXi2 D5.S32 |
| 85 #define dXr3 D6.S32 |
| 86 #define dXi3 D7.S32 |
| 87 #define dYr0 D8.S32 |
| 88 #define dYi0 D9.S32 |
| 89 #define dYr1 D10.S32 |
| 90 #define dYi1 D11.S32 |
| 91 #define dYr2 D12.S32 |
| 92 #define dYi2 D13.S32 |
| 93 #define dYr3 D14.S32 |
| 94 #define dYi3 D15.S32 |
| 95 #define qX0 Q0.S32 |
| 96 #define qX1 Q1.S32 |
| 97 #define qX2 Q2.S32 |
| 98 #define qX3 Q3.S32 |
| 99 #define qY0 Q4.S32 |
| 100 #define qY1 Q5.S32 |
| 101 #define qY2 Q6.S32 |
| 102 #define qY3 Q7.S32 |
| 103 #define dZr0 D16.S32 |
| 104 #define dZi0 D17.S32 |
| 105 #define dZr1 D18.S32 |
| 106 #define dZi1 D19.S32 |
| 107 #define dZr2 D20.S32 |
| 108 #define dZi2 D21.S32 |
| 109 #define dZr3 D22.S32 |
| 110 #define dZi3 D23.S32 |
| 111 #define qZ0 Q8.S32 |
| 112 #define qZ1 Q9.S32 |
| 113 #define qZ2 Q10.S32 |
| 114 #define qZ3 Q11.S32 |
| 115 |
| 116 |
| 117 .MACRO FFTSTAGE scaled, inverse, name |
| 118 |
| 119 @// Define stack arguments |
| 120 |
| 121 @// pT0+1 increments pT0 by 8 bytes |
| 122 @// pT0+pointStep = increment of 8*pointStep bytes = 2*grpSize bytes |
| 123 @// Note: outPointStep = pointStep for firststage |
| 124 |
| 125 MOV pointStep,subFFTNum,LSL #1 |
| 126 |
| 127 |
| 128 @// Update pSubFFTSize and pSubFFTNum regs |
| 129 VLD2 {dXr0,dXi0},[pSrc :128],pointStep @// data[0] |
| 130 MOV subFFTSize,#4 @// subFFTSize = 1
for the first stage |
| 131 |
| 132 @// Note: setCount = subFFTNum/4 (reuse the grpSize reg for setCount) |
| 133 LSR grpSize,subFFTNum,#2 |
| 134 VLD2 {dXr1,dXi1},[pSrc :128],pointStep @// data[1] |
| 135 MOV subFFTNum,grpSize |
| 136 |
| 137 |
| 138 @// Calculate the step of input data for the next set |
| 139 @//MOV setStep,pointStep,LSL #1 |
| 140 MOV setStep,grpSize,LSL #4 |
| 141 VLD2 {dXr2,dXi2},[pSrc :128],pointStep @// data[2] |
| 142 ADD setStep,setStep,pointStep @// setStep = 3*poin
tStep |
| 143 RSB setStep,setStep,#16 @// setStep = - 3*po
intStep+16 |
| 144 |
| 145 VLD2 {dXr3,dXi3},[pSrc :128],setStep @// data[3] & update
pSrc for the next set |
| 146 MOV step1,pointStep,LSL #1 @// step1 = 2*pointS
tep |
| 147 |
| 148 .ifeqs "\scaled", "TRUE" |
| 149 VHADD qY0,qX0,qX2 |
| 150 .else |
| 151 VADD qY0,qX0,qX2 |
| 152 .endif |
| 153 |
| 154 RSB step3,pointStep,#0 @// step3 = -pointSt
ep |
| 155 |
| 156 @// grp = 0 a special case since all the twiddle factors are 1 |
| 157 @// Loop on the sets : 2 sets at a time |
| 158 |
| 159 grpZeroSetLoop\name : |
| 160 |
| 161 |
| 162 |
| 163 @// Decrement setcount |
| 164 SUBS setCount,setCount,#2 @// decrement the set lo
op counter |
| 165 |
| 166 .ifeqs "\scaled", "TRUE" |
| 167 |
| 168 @// finish first stage of 4 point FFT |
| 169 |
| 170 VHSUB qY2,qX0,qX2 |
| 171 |
| 172 VLD2 {dXr0,dXi0},[pSrc :128],step1 @// data[0] |
| 173 VHADD qY1,qX1,qX3 |
| 174 VLD2 {dXr2,dXi2},[pSrc :128],step3 @// data[2] |
| 175 VHSUB qY3,qX1,qX3 |
| 176 |
| 177 |
| 178 @// finish second stage of 4 point FFT |
| 179 |
| 180 .ifeqs "\inverse", "TRUE" |
| 181 |
| 182 VLD2 {dXr1,dXi1},[pSrc :128],step1 @// data[1] |
| 183 VHADD qZ0,qY0,qY1 |
| 184 |
| 185 VLD2 {dXr3,dXi3},[pSrc :128],setStep @// data[3]
& update pSrc for the next set |
| 186 VHSUB dZr3,dYr2,dYi3 |
| 187 |
| 188 VST2 {dZr0,dZi0},[pDst :128],outPointStep |
| 189 VHADD dZi3,dYi2,dYr3 |
| 190 |
| 191 VHSUB qZ1,qY0,qY1 |
| 192 VST2 {dZr3,dZi3},[pDst :128],outPointStep |
| 193 |
| 194 VHADD dZr2,dYr2,dYi3 |
| 195 VST2 {dZr1,dZi1},[pDst :128],outPointStep |
| 196 VHSUB dZi2,dYi2,dYr3 |
| 197 |
| 198 VHADD qY0,qX0,qX2 @// u0 for next iterati
on |
| 199 VST2 {dZr2,dZi2},[pDst :128],setStep |
| 200 |
| 201 |
| 202 .else |
| 203 |
| 204 VLD2 {dXr1,dXi1},[pSrc :128],step1 @// data[1] |
| 205 VHADD qZ0,qY0,qY1 |
| 206 |
| 207 VLD2 {dXr3,dXi3},[pSrc :128],setStep @// data[3]
& update pSrc for the next set |
| 208 VHADD dZr2,dYr2,dYi3 |
| 209 |
| 210 VST2 {dZr0,dZi0},[pDst :128],outPointStep |
| 211 VHSUB dZi2,dYi2,dYr3 |
| 212 |
| 213 VHSUB qZ1,qY0,qY1 |
| 214 VST2 {dZr2,dZi2},[pDst :128],outPointStep |
| 215 |
| 216 VHSUB dZr3,dYr2,dYi3 |
| 217 VST2 {dZr1,dZi1},[pDst :128],outPointStep |
| 218 VHADD dZi3,dYi2,dYr3 |
| 219 |
| 220 VHADD qY0,qX0,qX2 @// u0 for next iterati
on |
| 221 VST2 {dZr3,dZi3},[pDst :128],setStep |
| 222 |
| 223 .endif |
| 224 |
| 225 |
| 226 |
| 227 .else |
| 228 |
| 229 @// finish first stage of 4 point FFT |
| 230 |
| 231 |
| 232 VSUB qY2,qX0,qX2 |
| 233 |
| 234 VLD2 {dXr0,dXi0},[pSrc :128],step1 @// data[0] |
| 235 VADD qY1,qX1,qX3 |
| 236 VLD2 {dXr2,dXi2},[pSrc :128],step3 @// data[2] |
| 237 VSUB qY3,qX1,qX3 |
| 238 |
| 239 |
| 240 @// finish second stage of 4 point FFT |
| 241 |
| 242 .ifeqs "\inverse", "TRUE" |
| 243 |
| 244 VLD2 {dXr1,dXi1},[pSrc :128],step1 @// data[1] |
| 245 VADD qZ0,qY0,qY1 |
| 246 |
| 247 VLD2 {dXr3,dXi3},[pSrc :128],setStep @// data[3]
& update pSrc for the next set |
| 248 VSUB dZr3,dYr2,dYi3 |
| 249 |
| 250 VST2 {dZr0,dZi0},[pDst :128],outPointStep |
| 251 VADD dZi3,dYi2,dYr3 |
| 252 |
| 253 VSUB qZ1,qY0,qY1 |
| 254 VST2 {dZr3,dZi3},[pDst :128],outPointStep |
| 255 |
| 256 VADD dZr2,dYr2,dYi3 |
| 257 VST2 {dZr1,dZi1},[pDst :128],outPointStep |
| 258 VSUB dZi2,dYi2,dYr3 |
| 259 |
| 260 VADD qY0,qX0,qX2 @// u0 for next iteratio
n |
| 261 VST2 {dZr2,dZi2},[pDst :128],setStep |
| 262 |
| 263 |
| 264 .else |
| 265 |
| 266 VLD2 {dXr1,dXi1},[pSrc :128],step1 @// data[1] |
| 267 VADD qZ0,qY0,qY1 |
| 268 |
| 269 VLD2 {dXr3,dXi3},[pSrc :128],setStep @// data[3]
& update pSrc for the next set |
| 270 VADD dZr2,dYr2,dYi3 |
| 271 |
| 272 VST2 {dZr0,dZi0},[pDst :128],outPointStep |
| 273 VSUB dZi2,dYi2,dYr3 |
| 274 |
| 275 VSUB qZ1,qY0,qY1 |
| 276 VST2 {dZr2,dZi2},[pDst :128],outPointStep |
| 277 |
| 278 VSUB dZr3,dYr2,dYi3 |
| 279 VST2 {dZr1,dZi1},[pDst :128],outPointStep |
| 280 VADD dZi3,dYi2,dYr3 |
| 281 |
| 282 VADD qY0,qX0,qX2 @// u0 for next iteratio
n |
| 283 VST2 {dZr3,dZi3},[pDst :128],setStep |
| 284 |
| 285 .endif |
| 286 |
| 287 .endif |
| 288 |
| 289 BGT grpZeroSetLoop\name |
| 290 |
| 291 @// reset pSrc to pDst for the next stage |
| 292 SUB pSrc,pDst,pointStep @// pDst -= 2*grpSize |
| 293 MOV pDst,pPingPongBuf |
| 294 |
| 295 |
| 296 .endm |
| 297 |
| 298 |
| 299 |
| 300 M_START armSP_FFTFwd_CToC_SC32_Radix4_fs_OutOfPlace_unsafe,r4 |
| 301 FFTSTAGE "FALSE","FALSE",fwd |
| 302 M_END |
| 303 |
| 304 |
| 305 |
| 306 M_START armSP_FFTInv_CToC_SC32_Radix4_fs_OutOfPlace_unsafe,r4 |
| 307 FFTSTAGE "FALSE","TRUE",inv |
| 308 M_END |
| 309 |
| 310 |
| 311 M_START armSP_FFTFwd_CToC_SC32_Sfs_Radix4_fs_OutOfPlace_unsafe,r4 |
| 312 FFTSTAGE "TRUE","FALSE",fwdsfs |
| 313 M_END |
| 314 |
| 315 |
| 316 M_START armSP_FFTInv_CToC_SC32_Sfs_Radix4_fs_OutOfPlace_unsafe,r4 |
| 317 FFTSTAGE "TRUE","TRUE",invsfs |
| 318 M_END |
| 319 |
| 320 .end |
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