Mercurial > pub > halpp

comparison f103c8/Drivers/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_sub_f32.c @ 2:0c59e7a7782a

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Working on GPIO and RCC
author cin
date Mon, 16 Jan 2017 11:04:47 +0300
parents
children
comparison
equal deleted inserted replaced
1:a0b14b11ad9f 2:0c59e7a7782a
1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
3 *
4 * $Date: 19. March 2015
5 * $Revision: V.1.4.5
6 *
7 * Project: CMSIS DSP Library
8 * Title: arm_sub_f32.c
9 *
10 * Description: Floating-point vector subtraction.
11 *
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * - Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * - Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in
21 * the documentation and/or other materials provided with the
22 * distribution.
23 * - Neither the name of ARM LIMITED nor the names of its contributors
24 * may be used to endorse or promote products derived from this
25 * software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 * POSSIBILITY OF SUCH DAMAGE.
39 * ---------------------------------------------------------------------------- */
40
41 #include "arm_math.h"
42
43 /**
44 * @ingroup groupMath
45 */
46
47 /**
48 * @defgroup BasicSub Vector Subtraction
49 *
50 * Element-by-element subtraction of two vectors.
51 *
52 * <pre>
53 * pDst[n] = pSrcA[n] - pSrcB[n], 0 <= n < blockSize.
54 * </pre>
55 *
56 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
57 */
58
59 /**
60 * @addtogroup BasicSub
61 * @{
62 */
63
64
65 /**
66 * @brief Floating-point vector subtraction.
67 * @param[in] *pSrcA points to the first input vector
68 * @param[in] *pSrcB points to the second input vector
69 * @param[out] *pDst points to the output vector
70 * @param[in] blockSize number of samples in each vector
71 * @return none.
72 */
73
74 void arm_sub_f32(
75 float32_t * pSrcA,
76 float32_t * pSrcB,
77 float32_t * pDst,
78 uint32_t blockSize)
79 {
80 uint32_t blkCnt; /* loop counter */
81
82 #ifndef ARM_MATH_CM0_FAMILY
83
84 /* Run the below code for Cortex-M4 and Cortex-M3 */
85 float32_t inA1, inA2, inA3, inA4; /* temporary variables */
86 float32_t inB1, inB2, inB3, inB4; /* temporary variables */
87
88 /*loop Unrolling */
89 blkCnt = blockSize >> 2u;
90
91 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
92 ** a second loop below computes the remaining 1 to 3 samples. */
93 while(blkCnt > 0u)
94 {
95 /* C = A - B */
96 /* Subtract and then store the results in the destination buffer. */
97 /* Read 4 input samples from sourceA and sourceB */
98 inA1 = *pSrcA;
99 inB1 = *pSrcB;
100 inA2 = *(pSrcA + 1);
101 inB2 = *(pSrcB + 1);
102 inA3 = *(pSrcA + 2);
103 inB3 = *(pSrcB + 2);
104 inA4 = *(pSrcA + 3);
105 inB4 = *(pSrcB + 3);
106
107 /* dst = srcA - srcB */
108 /* subtract and store the result */
109 *pDst = inA1 - inB1;
110 *(pDst + 1) = inA2 - inB2;
111 *(pDst + 2) = inA3 - inB3;
112 *(pDst + 3) = inA4 - inB4;
113
114
115 /* Update pointers to process next sampels */
116 pSrcA += 4u;
117 pSrcB += 4u;
118 pDst += 4u;
119
120 /* Decrement the loop counter */
121 blkCnt--;
122 }
123
124 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
125 ** No loop unrolling is used. */
126 blkCnt = blockSize % 0x4u;
127
128 #else
129
130 /* Run the below code for Cortex-M0 */
131
132 /* Initialize blkCnt with number of samples */
133 blkCnt = blockSize;
134
135 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
136
137 while(blkCnt > 0u)
138 {
139 /* C = A - B */
140 /* Subtract and then store the results in the destination buffer. */
141 *pDst++ = (*pSrcA++) - (*pSrcB++);
142
143 /* Decrement the loop counter */
144 blkCnt--;
145 }
146 }
147
148 /**
149 * @} end of BasicSub group
150 */