1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
@//
@// Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
@//
@// Use of this source code is governed by a BSD-style license
@// that can be found in the LICENSE file in the root of the source
@// tree. An additional intellectual property rights grant can be found
@// in the file PATENTS. All contributing project authors may
@// be found in the AUTHORS file in the root of the source tree.
@//
@// This is a modification of armSP_FFT_CToC_SC32_Radix2_unsafe_s.s
@// to support float instead of SC32.
@//
@// Description:
@// Compute a Radix 2 DIT in-order out-of-place FFT stage for an N point
@// complex signal. This handles the general stage, not the first or last
@// stage.
@//
@//
@// Include standard headers
#include "dl/api/armCOMM_s.h"
#include "dl/api/omxtypes_s.h"
@// Import symbols required from other files
@// (For example tables)
@// Set debugging level
@//DEBUG_ON SETL {TRUE}
@// Guarding implementation by the processor name
@// Guarding implementation by the processor name
@//Input Registers
#define pSrc r0
#define pDst r2
#define pTwiddle r1
#define subFFTNum r6
#define subFFTSize r7
@//Output Registers
@//Local Scratch Registers
#define outPointStep r3
#define pointStep r4
#define grpCount r5
#define setCount r8
@//const RN 9
#define step r10
#define dstStep r11
#define pTable r9
#define pTmp r9
@// Neon Registers
#define dW D0
#define dX0 D2
#define dX1 D3
#define dX2 D4
#define dX3 D5
#define dY0 D6
#define dY1 D7
#define dY2 D8
#define dY3 D9
#define qT0 D10
#define qT1 D11
.MACRO FFTSTAGE scaled, inverse, name
@// Define stack arguments
@// Update grpCount and grpSize rightaway inorder to reuse pGrpCount
@// and pGrpSize regs
LSR subFFTNum,subFFTNum,#1 @//grpSize
LSL grpCount,subFFTSize,#1
@// pT0+1 increments pT0 by 8 bytes
@// pT0+pointStep = increment of 8*pointStep bytes = 4*grpSize bytes
MOV pointStep,subFFTNum,LSL #2
@// update subFFTSize for the next stage
MOV subFFTSize,grpCount
@// pOut0+1 increments pOut0 by 8 bytes
@// pOut0+outPointStep == increment of 8*outPointStep bytes =
@// 4*size bytes
SMULBB outPointStep,grpCount,pointStep
LSL pointStep,pointStep,#1
RSB step,pointStep,#16
RSB dstStep,outPointStep,#16
@// Loop on the groups
radix2GrpLoop\name :
MOV setCount,pointStep,LSR #3
VLD1.F32 dW,[pTwiddle],pointStep @//[wi | wr]
@// Loop on the sets
radix2SetLoop\name :
@// point0: dX0-real part dX1-img part
VLD2.F32 {dX0,dX1},[pSrc],pointStep
@// point1: dX2-real part dX3-img part
VLD2.F32 {dX2,dX3},[pSrc],step
SUBS setCount,setCount,#2
.ifeqs "\inverse", "TRUE"
VMUL.F32 qT0,dX2,dW[0]
VMLA.F32 qT0,dX3,dW[1] @// real part
VMUL.F32 qT1,dX3,dW[0]
VMLS.F32 qT1,dX2,dW[1] @// imag part
.else
VMUL.F32 qT0,dX2,dW[0]
VMLS.F32 qT0,dX3,dW[1] @// real part
VMUL.F32 qT1,dX3,dW[0]
VMLA.F32 qT1,dX2,dW[1] @// imag part
.endif
VSUB.F32 dY0,dX0,qT0
VSUB.F32 dY1,dX1,qT1
VADD.F32 dY2,dX0,qT0
VADD.F32 dY3,dX1,qT1
VST2.F32 {dY0,dY1},[pDst],outPointStep
@// dstStep = -outPointStep + 16
VST2.F32 {dY2,dY3},[pDst],dstStep
BGT radix2SetLoop\name
SUBS grpCount,grpCount,#2
ADD pSrc,pSrc,pointStep
BGT radix2GrpLoop\name
@// Reset and Swap pSrc and pDst for the next stage
MOV pTmp,pDst
@// pDst -= 4*size; pSrc -= 8*size bytes
SUB pDst,pSrc,outPointStep,LSL #1
SUB pSrc,pTmp,outPointStep
@// Reset pTwiddle for the next stage
@// pTwiddle -= 4*size bytes
SUB pTwiddle,pTwiddle,outPointStep
.endm
M_START armSP_FFTFwd_CToC_FC32_Radix2_OutOfPlace_unsafe,r4
FFTSTAGE "FALSE","FALSE",FWD
M_END
M_START armSP_FFTInv_CToC_FC32_Radix2_OutOfPlace_unsafe,r4
FFTSTAGE "FALSE","TRUE",INV
M_END
.end
|
