summaryrefslogtreecommitdiffstats
path: root/media/openmax_dl/dl/sp/src/omxSP_FFTFwd_CToC_FC32_Sfs_s.S
blob: da0c10f1f66f09c4e07bc20f14f7922bfaa0d362 (plain)
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
192
@//
@//  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 omxSP_FFTFwd_CToC_SC32_Sfs_s.s
@//  to support float instead of SC32.
@//

@//
@// Description:
@// Compute an inverse FFT for a complex signal
@//
@//


@// Include standard headers

#include "dl/api/armCOMM_s.h"
#include "dl/api/omxtypes_s.h"

@// Import symbols required from other files
@// (For example tables)

        .extern  armSP_FFTFwd_CToC_FC32_Radix2_fs_OutOfPlace_unsafe
        .extern  armSP_FFTFwd_CToC_FC32_Radix4_fs_OutOfPlace_unsafe
        .extern  armSP_FFTFwd_CToC_FC32_Radix8_fs_OutOfPlace_unsafe
        .extern  armSP_FFTFwd_CToC_FC32_Radix4_OutOfPlace_unsafe
        .extern  armSP_FFTFwd_CToC_FC32_Radix2_OutOfPlace_unsafe

@// Set debugging level
@//DEBUG_ON    SETL {TRUE}



@// Guarding implementation by the processor name



    @// Guarding implementation by the processor name

@// Import symbols required from other files
@// (For example tables)
        .extern  armSP_FFTFwd_CToC_FC32_Radix2_ls_OutOfPlace_unsafe
        .extern  armSP_FFTFwd_CToC_FC32_Sfs_Radix2_ls_OutOfPlace_unsafe


@//Input Registers

#define pSrc            r0
#define pDst            r1
#define pFFTSpec        r2


@// Output registers
#define result          r0

@//Local Scratch Registers

#define argTwiddle      r1
#define argDst          r2
#define argScale        r4
#define tmpOrder        r4
#define pTwiddle        r4
#define pOut            r5
#define subFFTSize      r7
#define subFFTNum       r6
#define N               r6
#define order           r14
#define diff            r9
@// Total num of radix stages required to comple the FFT
#define count           r8
#define x0r             r4
#define x0i             r5
#define diffMinusOne    r2

@// Neon registers

#define dX0     D0.F32


    @// Allocate stack memory required by the function

    @// Write function header
        M_START     omxSP_FFTFwd_CToC_FC32_Sfs,r11,d15

@ Structure offsets for the FFTSpec
        .set    ARMsFFTSpec_N, 0
        .set    ARMsFFTSpec_pBitRev, 4
        .set    ARMsFFTSpec_pTwiddle, 8
        .set    ARMsFFTSpec_pBuf, 12

        @// Define stack arguments

        @// Read the size from structure and take log
        LDR     N, [pFFTSpec, #ARMsFFTSpec_N]

        @// Read other structure parameters
        LDR     pTwiddle, [pFFTSpec, #ARMsFFTSpec_pTwiddle]
        LDR     pOut, [pFFTSpec, #ARMsFFTSpec_pBuf]

        CLZ     order,N                             @// N = 2^order
        RSB     order,order,#31
        MOV     subFFTSize,#1
        @//MOV     subFFTNum,N

        CMP     order,#3
        BGT     orderGreaterthan3                   @// order > 3

        CMP     order,#1
        BGE     orderGreaterthan0                   @// order > 0
        VLD1    dX0,[pSrc]
        VST1    dX0,[pDst]
        MOV     pSrc,pDst
        BLT     FFTEnd

orderGreaterthan0:
        @// set the buffers appropriately for various orders
        CMP     order,#2
        MOVNE   argDst,pDst
        MOVEQ   argDst,pOut
        @// Pass the first stage destination in RN5
        MOVEQ   pOut,pDst
        MOV     argTwiddle,pTwiddle

        CMP     order,#1
        BGT     orderGreaterthan1
        @// order = 1
        BL    armSP_FFTFwd_CToC_FC32_Radix2_fs_OutOfPlace_unsafe
        B       FFTEnd

orderGreaterthan1:
        CMP     order,#2
        BGT     orderGreaterthan2
        @// order = 2
        BL    armSP_FFTFwd_CToC_FC32_Radix2_fs_OutOfPlace_unsafe
        BL    armSP_FFTFwd_CToC_FC32_Radix2_ls_OutOfPlace_unsafe
        B       FFTEnd

orderGreaterthan2:                                                                     @// order =3
        BL    armSP_FFTFwd_CToC_FC32_Radix2_fs_OutOfPlace_unsafe
        BL    armSP_FFTFwd_CToC_FC32_Radix2_OutOfPlace_unsafe
        BL    armSP_FFTFwd_CToC_FC32_Radix2_ls_OutOfPlace_unsafe
        B       FFTEnd

orderGreaterthan3:
        @// Set input args to fft stages
        TST     order, #2
        MOVNE   argDst,pDst
        MOVEQ   argDst,pOut
        @// Pass the first stage destination in RN5
        MOVEQ   pOut,pDst
        MOV     argTwiddle,pTwiddle

        @//check for even or odd order
        @// NOTE: The following combination of BL's would work fine even though
        @// the first BL would corrupt the flags. This is because the end of
        @// the "grpZeroSetLoop" loop inside
        @// armSP_FFTFwd_CToC_FC32_Radix4_fs_OutOfPlace_unsafe sets the Z flag
        @// to EQ

        TST     order,#0x00000001
        BLEQ    armSP_FFTFwd_CToC_FC32_Radix4_fs_OutOfPlace_unsafe
        BLNE    armSP_FFTFwd_CToC_FC32_Radix8_fs_OutOfPlace_unsafe

        CMP        subFFTNum,#4
        BLT     FFTEnd


unscaledRadix4Loop:
        BEQ        lastStageUnscaledRadix4
         BL        armSP_FFTFwd_CToC_FC32_Radix4_OutOfPlace_unsafe
         CMP        subFFTNum,#4
         B        unscaledRadix4Loop

lastStageUnscaledRadix4:
        BL      armSP_FFTFwd_CToC_FC32_Radix4_ls_OutOfPlace_unsafe
        B        FFTEnd

FFTEnd:

        @// Set return value
        MOV     result, #OMX_Sts_NoErr

        @// Write function tail
        M_END

        .end