1 /******************************************************************************
2 * @file arm_vec_fft.h
3 * @brief Private header file for CMSIS DSP Library
4 * @version V1.7.0
5 * @date 07. January 2020
6 ******************************************************************************/
7 /*
8 * Copyright (c) 2010-2020 Arm Limited or its affiliates. All rights reserved.
9 *
10 * SPDX-License-Identifier: Apache-2.0
11 *
12 * Licensed under the Apache License, Version 2.0 (the License); you may
13 * not use this file except in compliance with the License.
14 * You may obtain a copy of the License at
15 *
16 * www.apache.org/licenses/LICENSE-2.0
17 *
18 * Unless required by applicable law or agreed to in writing, software
19 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
20 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
21 * See the License for the specific language governing permissions and
22 * limitations under the License.
23 */
24
25 #ifndef _ARM_VEC_FFT_H_
26 #define _ARM_VEC_FFT_H_
27
28 #include "arm_math.h"
29 #include "arm_helium_utils.h"
30
31 #ifdef __cplusplus
32 extern "C"
33 {
34 #endif
35
36 #if (defined(ARM_MATH_MVEF) || defined(ARM_MATH_MVEI) || defined(ARM_MATH_HELIUM)) && !defined(ARM_MATH_AUTOVECTORIZE)
37
38 #define MVE_CMPLX_ADD_A_ixB(A, B) vcaddq_rot90(A,B)
39 #define MVE_CMPLX_SUB_A_ixB(A,B) vcaddq_rot270(A,B)
40 #define MVE_CMPLX_MULT_FLT_AxB(A,B) vcmlaq_rot90(vcmulq(A, B), A, B)
41 #define MVE_CMPLX_MULT_FLT_Conj_AxB(A,B) vcmlaq_rot270(vcmulq(A, B), A, B)
42
43 #define MVE_CMPLX_MULT_FX_AxB(A,B) vqdmladhxq(vqdmlsdhq((__typeof(A))vuninitializedq_s32(), A, B), A, B)
44 #define MVE_CMPLX_MULT_FX_AxConjB(A,B) vqdmladhq(vqdmlsdhxq((__typeof(A))vuninitializedq_s32(), A, B), A, B)
45
46 #define MVE_CMPLX_ADD_FX_A_ixB(A, B) vhcaddq_rot90(A,B)
47 #define MVE_CMPLX_SUB_FX_A_ixB(A,B) vhcaddq_rot270(A,B)
48
49
50 /**
51 @brief In-place 32 bit reversal function for helium
52 @param[in,out] pSrc points to in-place buffer of unknown 32-bit data type
53 @param[in] bitRevLen bit reversal table length
54 @param[in] pBitRevTab points to bit reversal table
55 @return none
56 */
57
arm_bitreversal_32_inpl_mve(uint32_t * pSrc,const uint16_t bitRevLen,const uint16_t * pBitRevTab)58 __STATIC_INLINE void arm_bitreversal_32_inpl_mve(
59 uint32_t *pSrc,
60 const uint16_t bitRevLen,
61 const uint16_t *pBitRevTab)
62
63 {
64 uint64_t *src = (uint64_t *) pSrc;
65 int32_t blkCnt; /* loop counters */
66 uint32x4_t bitRevTabOff;
67 uint32x4_t one = vdupq_n_u32(1);
68 uint64x2_t inLow, inHigh;
69 uint64x2_t bitRevOff1Low, bitRevOff0Low;
70 uint64x2_t bitRevOff1High, bitRevOff0High;
71
72 /* load scheduling to increase gather load idx update / gather load distance */
73 bitRevTabOff = vldrhq_u32(pBitRevTab);
74 pBitRevTab += 4;
75
76 bitRevOff0Low = vmullbq_int_u32(bitRevTabOff, one);
77 bitRevOff0High = vmulltq_int_u32(bitRevTabOff, one);
78
79
80 blkCnt = bitRevLen / 8;
81 while (blkCnt > 0) {
82 bitRevTabOff = vldrhq_u32(pBitRevTab);
83 pBitRevTab += 4;
84
85 /* 64-bit index expansion */
86 bitRevOff1Low = vmullbq_int_u32(bitRevTabOff, one);
87 bitRevOff1High = vmulltq_int_u32(bitRevTabOff, one);
88
89 inLow = vldrdq_gather_offset_u64(src, bitRevOff0Low);
90 inHigh = vldrdq_gather_offset_u64(src, bitRevOff0High);
91
92 vstrdq_scatter_offset_u64(src, bitRevOff0Low, inHigh);
93 vstrdq_scatter_offset_u64(src, bitRevOff0High, inLow);
94
95
96 /* unrolled */
97 bitRevTabOff = vldrhq_u32(pBitRevTab);
98 pBitRevTab += 4;
99
100 bitRevOff0Low = vmullbq_int_u32(bitRevTabOff, one);
101 bitRevOff0High = vmulltq_int_u32(bitRevTabOff, one);
102
103 inLow = vldrdq_gather_offset_u64(src, bitRevOff1Low);
104 inHigh = vldrdq_gather_offset_u64(src, bitRevOff1High);
105
106 vstrdq_scatter_offset_u64(src, bitRevOff1Low, inHigh);
107 vstrdq_scatter_offset_u64(src, bitRevOff1High, inLow);
108
109 /*
110 * Decrement the blockSize loop counter
111 */
112 blkCnt--;
113 }
114
115 if (bitRevLen & 7) {
116 /* FFT size = 16 */
117 inLow = vldrdq_gather_offset_u64(src, bitRevOff0Low);
118 inHigh = vldrdq_gather_offset_u64(src, bitRevOff0High);
119
120 vstrdq_scatter_offset_u64(src, bitRevOff0Low, inHigh);
121 vstrdq_scatter_offset_u64(src, bitRevOff0High, inLow);
122 }
123 }
124
125
126
127 /**
128 @brief In-place 16 bit reversal function for helium
129 @param[in,out] pSrc points to in-place buffer of unknown 16-bit data type
130 @param[in] bitRevLen bit reversal table length
131 @param[in] pBitRevTab points to bit reversal table
132 @return none
133 */
134
arm_bitreversal_16_inpl_mve(uint16_t * pSrc,const uint16_t bitRevLen,const uint16_t * pBitRevTab)135 __STATIC_INLINE void arm_bitreversal_16_inpl_mve(
136 uint16_t *pSrc,
137 const uint16_t bitRevLen,
138 const uint16_t *pBitRevTab)
139
140 {
141 uint32_t *src = (uint32_t *) pSrc;
142 int32_t blkCnt; /* loop counters */
143 uint32x4_t bitRevTabOff;
144 uint16x8_t one = vdupq_n_u16(1);
145 uint32x4_t bitRevOff1Low, bitRevOff0Low;
146 uint32x4_t bitRevOff1High, bitRevOff0High;
147 uint32x4_t inLow, inHigh;
148
149 /* load scheduling to increase gather load idx update / gather load distance */
150 bitRevTabOff = vldrhq_u16(pBitRevTab);
151 pBitRevTab += 8;
152
153 bitRevOff0Low = vmullbq_int_u16(bitRevTabOff, one);
154 bitRevOff0High = vmulltq_int_u16(bitRevTabOff, one);
155 bitRevOff0Low = vshrq_n_u16(bitRevOff0Low, 3);
156 bitRevOff0High = vshrq_n_u16(bitRevOff0High, 3);
157
158 blkCnt = (bitRevLen / 16);
159 while (blkCnt > 0) {
160 bitRevTabOff = vldrhq_u16(pBitRevTab);
161 pBitRevTab += 8;
162
163 bitRevOff1Low = vmullbq_int_u16(bitRevTabOff, one);
164 bitRevOff1High = vmulltq_int_u16(bitRevTabOff, one);
165 bitRevOff1Low = vshrq_n_u16(bitRevOff1Low, 3);
166 bitRevOff1High = vshrq_n_u16(bitRevOff1High, 3);
167
168 inLow = vldrwq_gather_shifted_offset_u32(src, bitRevOff0Low);
169 inHigh = vldrwq_gather_shifted_offset_u32(src, bitRevOff0High);
170
171 vstrwq_scatter_shifted_offset_u32(src, bitRevOff0Low, inHigh);
172 vstrwq_scatter_shifted_offset_u32(src, bitRevOff0High, inLow);
173
174 /* loop unrolling */
175 bitRevTabOff = vldrhq_u16(pBitRevTab);
176 pBitRevTab += 8;
177
178 bitRevOff0Low = vmullbq_int_u16(bitRevTabOff, one);
179 bitRevOff0High = vmulltq_int_u16(bitRevTabOff, one);
180 bitRevOff0Low = vshrq_n_u16(bitRevOff0Low, 3);
181 bitRevOff0High = vshrq_n_u16(bitRevOff0High, 3);
182
183 inLow = vldrwq_gather_shifted_offset_u32(src, bitRevOff1Low);
184 inHigh = vldrwq_gather_shifted_offset_u32(src, bitRevOff1High);
185
186 vstrwq_scatter_shifted_offset_u32(src, bitRevOff1Low, inHigh);
187 vstrwq_scatter_shifted_offset_u32(src, bitRevOff1High, inLow);
188
189 blkCnt--;
190 }
191
192 /* tail handling */
193 blkCnt = bitRevLen & 0xf;
194 if (blkCnt == 8) {
195 inLow = vldrwq_gather_shifted_offset_u32(src, bitRevOff0Low);
196 inHigh = vldrwq_gather_shifted_offset_u32(src, bitRevOff0High);
197
198 vstrwq_scatter_shifted_offset_u32(src, bitRevOff0Low, inHigh);
199 vstrwq_scatter_shifted_offset_u32(src, bitRevOff0High, inLow);
200 } else if (blkCnt == 12) {
201 /* FFT 16 special case */
202 mve_pred16_t p = vctp16q(4);
203
204 bitRevTabOff = vldrhq_z_u16(pBitRevTab, p);
205
206 inLow = vldrwq_gather_shifted_offset_u32(src, bitRevOff0Low);
207 inHigh = vldrwq_gather_shifted_offset_u32(src, bitRevOff0High);
208
209 vstrwq_scatter_shifted_offset_u32(src, bitRevOff0Low, inHigh);
210 vstrwq_scatter_shifted_offset_u32(src, bitRevOff0High, inLow);
211
212 bitRevOff0Low = vmullbq_int_u16(bitRevTabOff, one);
213 bitRevOff0High = vmulltq_int_u16(bitRevTabOff, one);
214 bitRevOff0Low = vshrq_n_u16(bitRevOff0Low, 3);
215 bitRevOff0High = vshrq_n_u16(bitRevOff0High, 3);
216
217 inLow = vldrwq_gather_shifted_offset_z_u32(src, bitRevOff0Low, p);
218 inHigh = vldrwq_gather_shifted_offset_z_u32(src, bitRevOff0High, p);
219
220 vstrwq_scatter_shifted_offset_p_u32(src, bitRevOff0Low, inHigh, p);
221 vstrwq_scatter_shifted_offset_p_u32(src, bitRevOff0High, inLow, p);
222 }
223 }
224
225 /**
226 @brief Out-of-place 32 bit reversal function for helium
227 @param[out] pDst points to destination buffer of unknown 32-bit data type
228 @param[in] pSrc points to input buffer of unknown 32-bit data type
229 @param[in] fftLen FFT length
230 @return none
231 */
arm_bitreversal_32_outpl_mve(void * pDst,void * pSrc,uint32_t fftLen)232 __STATIC_INLINE void arm_bitreversal_32_outpl_mve(void *pDst, void *pSrc, uint32_t fftLen)
233 {
234 uint32x4_t idxOffs0, idxOffs1, bitRevOffs0, bitRevOffs1;
235 uint32_t bitRevPos, blkCnt;
236 uint32_t *pDst32 = (uint32_t *) pDst;
237
238 /* fwd indexes */
239 idxOffs0 = vdupq_n_u32(0);
240 idxOffs1 = vdupq_n_u32(0);
241 idxOffs0[0] = 0; idxOffs0[2] = 4;
242 idxOffs1[0] = 8; idxOffs1[2] = 12;
243
244 bitRevPos = (31 - __CLZ(fftLen)) + 5;
245 blkCnt = fftLen >> 2;
246
247 /* issued earlier to increase gather load idx update / gather load distance */
248 /* bit-reverse fwd indexes */
249 bitRevOffs0 = vbrsrq(idxOffs0, bitRevPos);
250 bitRevOffs1 = vbrsrq(idxOffs1, bitRevPos);
251 while (blkCnt > 0) {
252 uint64x2_t vecIn;
253
254 vecIn = vldrdq_gather_offset_u64(pSrc, (int64x2_t) bitRevOffs0);
255 idxOffs0 = idxOffs0 + 16;
256 vst1q(pDst32, (uint32x4_t) vecIn);
257 pDst32 += 4;
258 bitRevOffs0 = vbrsrq(idxOffs0, bitRevPos);
259
260 vecIn = vldrdq_gather_offset_u64(pSrc, (int64x2_t) bitRevOffs1);
261 idxOffs1 = idxOffs1 + 16;
262 vst1q(pDst32, (uint32x4_t) vecIn);
263 pDst32 += 4;
264 bitRevOffs1 = vbrsrq(idxOffs1, bitRevPos);
265
266 blkCnt--;
267 }
268 }
269
270
271 /**
272 @brief Out-of-place 16 bit reversal function for helium
273 @param[out] pDst points to destination buffer of unknown 16-bit data type
274 @param[in] pSrc points to input buffer of unknown 16-bit data type
275 @param[in] fftLen FFT length
276 @return none
277 */
278
arm_bitreversal_16_outpl_mve(void * pDst,void * pSrc,uint32_t fftLen)279 __STATIC_INLINE void arm_bitreversal_16_outpl_mve(void *pDst, void *pSrc, uint32_t fftLen)
280 {
281 uint32x4_t idxOffs0, idxOffs1, bitRevOffs0, bitRevOffs1;
282 uint32_t bitRevPos, blkCnt;
283 uint16_t *pDst16 = (uint16_t *) pDst;
284 uint32_t incrIdx = 0;
285
286 /* fwd indexes */
287 idxOffs0 = vidupq_wb_u32(&incrIdx, 4); // {0, 4, 8, 12}
288 idxOffs1 = vidupq_wb_u32(&incrIdx, 4); // {16, 20, 24, 28}
289
290 bitRevPos = (31 - __CLZ(fftLen)) + 4;
291 blkCnt = fftLen >> 3;
292
293 /* issued earlier to increase gather load idx update / gather load distance */
294 /* bit-reverse fwd indexes */
295 bitRevOffs0 = vbrsrq(idxOffs0, bitRevPos);
296 bitRevOffs1 = vbrsrq(idxOffs1, bitRevPos);
297 while (blkCnt > 0) {
298 uint32x4_t vecIn;
299
300 vecIn = vldrwq_gather_offset_s32(pSrc, bitRevOffs0);
301 idxOffs0 = idxOffs0 + 32;
302 vst1q(pDst16, (uint16x8_t) vecIn);
303 pDst16 += 8;
304 bitRevOffs0 = vbrsrq(idxOffs0, bitRevPos);
305
306 vecIn = vldrwq_gather_offset_s32(pSrc, bitRevOffs1);
307 idxOffs1 = idxOffs1 + 32;
308 vst1q(pDst16, (uint16x8_t) vecIn);
309 pDst16 += 8;
310 bitRevOffs1 = vbrsrq(idxOffs1, bitRevPos);
311
312 blkCnt--;
313 }
314 }
315
316
317 #endif /* (defined(ARM_MATH_MVEF) || defined(ARM_MATH_HELIUM)) && !defined(ARM_MATH_AUTOVECTORIZE)*/
318
319
320 #ifdef __cplusplus
321 }
322 #endif
323
324
325 #endif /* _ARM_VEC_FFT_H_ */
