1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_mult_f32.c
4 * Description: Floating-point vector multiplication
5 *
6 * $Date: 23 April 2021
7 * $Revision: V1.9.0
8 *
9 * Target Processor: Cortex-M and Cortex-A cores
10 * -------------------------------------------------------------------- */
11 /*
12 * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
13 *
14 * SPDX-License-Identifier: Apache-2.0
15 *
16 * Licensed under the Apache License, Version 2.0 (the License); you may
17 * not use this file except in compliance with the License.
18 * You may obtain a copy of the License at
19 *
20 * www.apache.org/licenses/LICENSE-2.0
21 *
22 * Unless required by applicable law or agreed to in writing, software
23 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
25 * See the License for the specific language governing permissions and
26 * limitations under the License.
27 */
28
29 #include "dsp/basic_math_functions.h"
30
31 /**
32 @ingroup groupMath
33 */
34
35 /**
36 @defgroup BasicMult Vector Multiplication
37
38 Element-by-element multiplication of two vectors.
39
40 <pre>
41 pDst[n] = pSrcA[n] * pSrcB[n], 0 <= n < blockSize.
42 </pre>
43
44 There are separate functions for floating-point, Q7, Q15, and Q31 data types.
45 */
46
47 /**
48 @addtogroup BasicMult
49 @{
50 */
51
52 /**
53 @brief Floating-point vector multiplication.
54 @param[in] pSrcA points to the first input vector.
55 @param[in] pSrcB points to the second input vector.
56 @param[out] pDst points to the output vector.
57 @param[in] blockSize number of samples in each vector.
58 @return none
59 */
60
61 #if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
62
63 #include "arm_helium_utils.h"
64
arm_mult_f32(const float32_t * pSrcA,const float32_t * pSrcB,float32_t * pDst,uint32_t blockSize)65 void arm_mult_f32(
66 const float32_t * pSrcA,
67 const float32_t * pSrcB,
68 float32_t * pDst,
69 uint32_t blockSize)
70 {
71 uint32_t blkCnt; /* Loop counter */
72
73 f32x4_t vec1;
74 f32x4_t vec2;
75 f32x4_t res;
76
77 /* Compute 4 outputs at a time */
78 blkCnt = blockSize >> 2U;
79 while (blkCnt > 0U)
80 {
81 /* C = A + B */
82
83 /* Add and then store the results in the destination buffer. */
84 vec1 = vld1q(pSrcA);
85 vec2 = vld1q(pSrcB);
86 res = vmulq(vec1, vec2);
87 vst1q(pDst, res);
88
89 /* Increment pointers */
90 pSrcA += 4;
91 pSrcB += 4;
92 pDst += 4;
93
94 /* Decrement the loop counter */
95 blkCnt--;
96 }
97
98 /* Tail */
99 blkCnt = blockSize & 0x3;
100 if (blkCnt > 0U)
101 {
102 /* C = A + B */
103 mve_pred16_t p0 = vctp32q(blkCnt);
104 vec1 = vld1q(pSrcA);
105 vec2 = vld1q(pSrcB);
106 vstrwq_p(pDst, vmulq(vec1,vec2), p0);
107 }
108
109 }
110
111 #else
arm_mult_f32(const float32_t * pSrcA,const float32_t * pSrcB,float32_t * pDst,uint32_t blockSize)112 void arm_mult_f32(
113 const float32_t * pSrcA,
114 const float32_t * pSrcB,
115 float32_t * pDst,
116 uint32_t blockSize)
117 {
118 uint32_t blkCnt; /* Loop counter */
119
120 #if defined(ARM_MATH_NEON) && !defined(ARM_MATH_AUTOVECTORIZE)
121 f32x4_t vec1;
122 f32x4_t vec2;
123 f32x4_t res;
124
125 /* Compute 4 outputs at a time */
126 blkCnt = blockSize >> 2U;
127
128 while (blkCnt > 0U)
129 {
130 /* C = A * B */
131
132 /* Multiply the inputs and then store the results in the destination buffer. */
133 vec1 = vld1q_f32(pSrcA);
134 vec2 = vld1q_f32(pSrcB);
135 res = vmulq_f32(vec1, vec2);
136 vst1q_f32(pDst, res);
137
138 /* Increment pointers */
139 pSrcA += 4;
140 pSrcB += 4;
141 pDst += 4;
142
143 /* Decrement the loop counter */
144 blkCnt--;
145 }
146
147 /* Tail */
148 blkCnt = blockSize & 0x3;
149
150 #else
151 #if defined (ARM_MATH_LOOPUNROLL) && !defined(ARM_MATH_AUTOVECTORIZE)
152
153 /* Loop unrolling: Compute 4 outputs at a time */
154 blkCnt = blockSize >> 2U;
155
156 while (blkCnt > 0U)
157 {
158 /* C = A * B */
159
160 /* Multiply inputs and store result in destination buffer. */
161 *pDst++ = (*pSrcA++) * (*pSrcB++);
162
163 *pDst++ = (*pSrcA++) * (*pSrcB++);
164
165 *pDst++ = (*pSrcA++) * (*pSrcB++);
166
167 *pDst++ = (*pSrcA++) * (*pSrcB++);
168
169 /* Decrement loop counter */
170 blkCnt--;
171 }
172
173 /* Loop unrolling: Compute remaining outputs */
174 blkCnt = blockSize % 0x4U;
175
176 #else
177
178 /* Initialize blkCnt with number of samples */
179 blkCnt = blockSize;
180
181 #endif /* #if defined (ARM_MATH_LOOPUNROLL) */
182 #endif /* #if defined(ARM_MATH_NEON) */
183
184 while (blkCnt > 0U)
185 {
186 /* C = A * B */
187
188 /* Multiply input and store result in destination buffer. */
189 *pDst++ = (*pSrcA++) * (*pSrcB++);
190
191 /* Decrement loop counter */
192 blkCnt--;
193 }
194
195 }
196 #endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
197
198 /**
199 @} end of BasicMult group
200 */
201