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1 /* ----------------------------------------------------------------------
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2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
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3 *
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4 * $Date: 19. March 2015
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5 * $Revision: V.1.4.5
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6 *
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7 * Project: CMSIS DSP Library
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8 * Title: arm_abs_f32.c
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9 *
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10 * Description: Vector absolute value.
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11 *
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12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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13 *
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14 * Redistribution and use in source and binary forms, with or without
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15 * modification, are permitted provided that the following conditions
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16 * are met:
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17 * - Redistributions of source code must retain the above copyright
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18 * notice, this list of conditions and the following disclaimer.
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19 * - Redistributions in binary form must reproduce the above copyright
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20 * notice, this list of conditions and the following disclaimer in
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21 * the documentation and/or other materials provided with the
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22 * distribution.
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23 * - Neither the name of ARM LIMITED nor the names of its contributors
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24 * may be used to endorse or promote products derived from this
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25 * software without specific prior written permission.
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26 *
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27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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38 * POSSIBILITY OF SUCH DAMAGE.
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39 * ---------------------------------------------------------------------------- */
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40
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41 #include "arm_math.h"
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42 #include <math.h>
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43
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44 /**
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45 * @ingroup groupMath
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46 */
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47
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48 /**
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49 * @defgroup BasicAbs Vector Absolute Value
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50 *
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51 * Computes the absolute value of a vector on an element-by-element basis.
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52 *
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53 * <pre>
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54 * pDst[n] = abs(pSrc[n]), 0 <= n < blockSize.
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55 * </pre>
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56 *
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57 * The functions support in-place computation allowing the source and
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58 * destination pointers to reference the same memory buffer.
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59 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
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60 */
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61
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62 /**
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63 * @addtogroup BasicAbs
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64 * @{
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65 */
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66
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67 /**
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68 * @brief Floating-point vector absolute value.
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69 * @param[in] *pSrc points to the input buffer
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70 * @param[out] *pDst points to the output buffer
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71 * @param[in] blockSize number of samples in each vector
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72 * @return none.
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73 */
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74
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75 void arm_abs_f32(
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76 float32_t * pSrc,
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77 float32_t * pDst,
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78 uint32_t blockSize)
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79 {
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80 uint32_t blkCnt; /* loop counter */
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81
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82 #ifndef ARM_MATH_CM0_FAMILY
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83
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84 /* Run the below code for Cortex-M4 and Cortex-M3 */
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85 float32_t in1, in2, in3, in4; /* temporary variables */
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86
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87 /*loop Unrolling */
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88 blkCnt = blockSize >> 2u;
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89
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90 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
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91 ** a second loop below computes the remaining 1 to 3 samples. */
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92 while(blkCnt > 0u)
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93 {
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94 /* C = |A| */
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95 /* Calculate absolute and then store the results in the destination buffer. */
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96 /* read sample from source */
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97 in1 = *pSrc;
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98 in2 = *(pSrc + 1);
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99 in3 = *(pSrc + 2);
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100
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101 /* find absolute value */
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102 in1 = fabsf(in1);
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103
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104 /* read sample from source */
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105 in4 = *(pSrc + 3);
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106
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107 /* find absolute value */
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108 in2 = fabsf(in2);
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109
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110 /* read sample from source */
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111 *pDst = in1;
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112
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113 /* find absolute value */
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114 in3 = fabsf(in3);
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115
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116 /* find absolute value */
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117 in4 = fabsf(in4);
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118
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119 /* store result to destination */
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120 *(pDst + 1) = in2;
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121
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122 /* store result to destination */
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123 *(pDst + 2) = in3;
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124
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125 /* store result to destination */
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126 *(pDst + 3) = in4;
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127
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128
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129 /* Update source pointer to process next sampels */
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130 pSrc += 4u;
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131
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132 /* Update destination pointer to process next sampels */
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133 pDst += 4u;
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134
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135 /* Decrement the loop counter */
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136 blkCnt--;
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137 }
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138
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139 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
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140 ** No loop unrolling is used. */
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141 blkCnt = blockSize % 0x4u;
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142
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143 #else
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144
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145 /* Run the below code for Cortex-M0 */
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146
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147 /* Initialize blkCnt with number of samples */
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148 blkCnt = blockSize;
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149
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150 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
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151
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152 while(blkCnt > 0u)
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153 {
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154 /* C = |A| */
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155 /* Calculate absolute and then store the results in the destination buffer. */
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156 *pDst++ = fabsf(*pSrc++);
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157
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158 /* Decrement the loop counter */
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159 blkCnt--;
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160 }
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161 }
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162
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163 /**
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164 * @} end of BasicAbs group
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165 */
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