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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_Radix2_ls_unsafe_s.s |
| 16 @// OpenMAX DL: v1.0.2 |
| 17 @// Last Modified Revision: 7493 |
| 18 @// Last Modified Date: Mon, 24 Sep 2007 |
| 19 @// |
| 20 @// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. |
| 21 @// |
| 22 @// |
| 23 @// |
| 24 @// Description: |
| 25 @// Compute the last stage of a Radix 2 DIT in-order out-of-place FFT |
| 26 @// stage for a N point complex signal. |
| 27 @// |
| 28 |
| 29 |
| 30 |
| 31 @// Include standard headers |
| 32 |
| 33 #include "dl/api/armCOMM_s.h" |
| 34 #include "dl/api/omxtypes_s.h" |
| 35 |
| 36 |
| 37 @// Import symbols required from other files |
| 38 @// (For example tables) |
| 39 |
| 40 |
| 41 |
| 42 |
| 43 @// Set debugging level |
| 44 @//DEBUG_ON SETL {TRUE} |
| 45 |
| 46 |
| 47 @// Guarding implementation by the processor name |
| 48 |
| 49 |
| 50 @//Input Registers |
| 51 |
| 52 #define pSrc r0 |
| 53 #define pDst r2 |
| 54 #define pTwiddle r1 |
| 55 #define subFFTNum r6 |
| 56 #define subFFTSize r7 |
| 57 |
| 58 |
| 59 @//Output Registers |
| 60 |
| 61 |
| 62 @//Local Scratch Registers |
| 63 |
| 64 |
| 65 #define outPointStep r3 |
| 66 #define grpCount r4 |
| 67 #define dstStep r5 |
| 68 #define pTmp r4 |
| 69 |
| 70 @// Neon Registers |
| 71 |
| 72 #define dWr D0.S32 |
| 73 #define dWi d1.s32 |
| 74 #define dXr0 d2.s32 |
| 75 #define dXi0 d3.s32 |
| 76 #define dXr1 d4.s32 |
| 77 #define dXi1 d5.s32 |
| 78 #define dYr0 d6.s32 |
| 79 #define dYi0 d7.s32 |
| 80 #define dYr1 d8.s32 |
| 81 #define dYi1 d9.s32 |
| 82 #define qT0 q5.s64 |
| 83 #define qT1 q6.s64 |
| 84 |
| 85 .macro FFTSTAGE scaled, inverse, name |
| 86 |
| 87 |
| 88 MOV outPointStep,subFFTSize,LSL #3 |
| 89 @// Update grpCount and grpSize rightaway |
| 90 |
| 91 MOV subFFTNum,#1 @//after the last stage |
| 92 LSL grpCount,subFFTSize,#1 |
| 93 |
| 94 @// update subFFTSize for the next stage |
| 95 MOV subFFTSize,grpCount |
| 96 |
| 97 RSB dstStep,outPointStep,#16 |
| 98 |
| 99 |
| 100 @// Loop on 2 grps at a time for the last stage |
| 101 |
| 102 grpLoop\name : |
| 103 VLD2 {dWr,dWi},[pTwiddle :64]! |
| 104 |
| 105 VLD4 {dXr0,dXi0,dXr1,dXi1},[pSrc :128]! |
| 106 SUBS grpCount,grpCount,#4 @// grpCount is multiplie
d by 2 |
| 107 |
| 108 .ifeqs "\inverse", "TRUE" |
| 109 VMULL qT0,dWr,dXr1 |
| 110 VMLAL qT0,dWi,dXi1 @// real part |
| 111 VMULL qT1,dWr,dXi1 |
| 112 VMLSL qT1,dWi,dXr1 @// imag part |
| 113 |
| 114 .else |
| 115 |
| 116 VMULL qT0,dWr,dXr1 |
| 117 VMLSL qT0,dWi,dXi1 @// real part |
| 118 VMULL qT1,dWr,dXi1 |
| 119 VMLAL qT1,dWi,dXr1 @// imag part |
| 120 |
| 121 .endif |
| 122 |
| 123 VRSHRN dXr1,qT0,#31 |
| 124 VRSHRN dXi1,qT1,#31 |
| 125 |
| 126 |
| 127 .ifeqs "\scaled", "TRUE" |
| 128 |
| 129 VHSUB dYr0,dXr0,dXr1 |
| 130 VHSUB dYi0,dXi0,dXi1 |
| 131 VHADD dYr1,dXr0,dXr1 |
| 132 VHADD dYi1,dXi0,dXi1 |
| 133 |
| 134 .else |
| 135 |
| 136 VSUB dYr0,dXr0,dXr1 |
| 137 VSUB dYi0,dXi0,dXi1 |
| 138 VADD dYr1,dXr0,dXr1 |
| 139 VADD dYi1,dXi0,dXi1 |
| 140 |
| 141 |
| 142 .endif |
| 143 |
| 144 VST2 {dYr0,dYi0},[pDst],outPointStep |
| 145 VST2 {dYr1,dYi1},[pDst],dstStep @// dstStep = step
= -outPointStep + 16 |
| 146 |
| 147 bgt grpLoop\name |
| 148 |
| 149 |
| 150 @// Reset and Swap pSrc and pDst for the next stage |
| 151 MOV pTmp,pDst |
| 152 SUB pDst,pSrc,outPointStep,LSL #1 @// pDst -= 4*size; pSrc -=
8*size bytes |
| 153 SUB pSrc,pTmp,outPointStep |
| 154 |
| 155 @// Reset pTwiddle for the next stage |
| 156 SUB pTwiddle,pTwiddle,outPointStep @// pTwiddle -= 4*size bytes |
| 157 |
| 158 .endm |
| 159 |
| 160 |
| 161 |
| 162 M_START armSP_FFTFwd_CToC_SC32_Radix2_ls_OutOfPlace_unsafe,r4,"" |
| 163 FFTSTAGE "FALSE","FALSE",fwd |
| 164 M_END |
| 165 |
| 166 |
| 167 |
| 168 M_START armSP_FFTInv_CToC_SC32_Radix2_ls_OutOfPlace_unsafe,r4 |
| 169 FFTSTAGE "FALSE","TRUE",inv |
| 170 M_END |
| 171 |
| 172 |
| 173 |
| 174 M_START armSP_FFTFwd_CToC_SC32_Sfs_Radix2_ls_OutOfPlace_unsafe,r4 |
| 175 FFTSTAGE "TRUE","FALSE",fwdsfs |
| 176 M_END |
| 177 |
| 178 |
| 179 |
| 180 M_START armSP_FFTInv_CToC_SC32_Sfs_Radix2_ls_OutOfPlace_unsafe,r4 |
| 181 FFTSTAGE "TRUE","TRUE",invsfs |
| 182 M_END |
| 183 |
| 184 .end |
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