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CMSIS DSP library

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cmsis_dsp/BasicMathFunctions/arm_negate_f32.c@5:3762170b6d4d, 2015-11-20 (annotated)

Committer:
mbed_official
Date:
Fri Nov 20 08:45:18 2015 +0000
Revision:
5:3762170b6d4d
Parent:
3:7a284390b0ce 
Synchronized with git revision 2eb940b9a73af188d3004a2575fdfbb05febe62b



Full URL: https://github.com/mbedmicro/mbed/commit/2eb940b9a73af188d3004a2575fdfbb05febe62b/



Added option to build rpc library. closes #1426

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 1:fdd22bb7aa52 1 /* ----------------------------------------------------------------------
mbed_official 5:3762170b6d4d 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
emilmont 1:fdd22bb7aa52 3 *
mbed_official 5:3762170b6d4d 4 * $Date: 19. March 2015
mbed_official 5:3762170b6d4d 5 * $Revision: V.1.4.5
emilmont 1:fdd22bb7aa52 6 *
emilmont 2:da51fb522205 7 * Project: CMSIS DSP Library
emilmont 2:da51fb522205 8 * Title: arm_negate_f32.c
emilmont 1:fdd22bb7aa52 9 *
emilmont 2:da51fb522205 10 * Description: Negates floating-point vectors.
emilmont 1:fdd22bb7aa52 11 *
emilmont 1:fdd22bb7aa52 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
emilmont 1:fdd22bb7aa52 13 *
mbed_official 3:7a284390b0ce 14 * Redistribution and use in source and binary forms, with or without
mbed_official 3:7a284390b0ce 15 * modification, are permitted provided that the following conditions
mbed_official 3:7a284390b0ce 16 * are met:
mbed_official 3:7a284390b0ce 17 * - Redistributions of source code must retain the above copyright
mbed_official 3:7a284390b0ce 18 * notice, this list of conditions and the following disclaimer.
mbed_official 3:7a284390b0ce 19 * - Redistributions in binary form must reproduce the above copyright
mbed_official 3:7a284390b0ce 20 * notice, this list of conditions and the following disclaimer in
mbed_official 3:7a284390b0ce 21 * the documentation and/or other materials provided with the
mbed_official 3:7a284390b0ce 22 * distribution.
mbed_official 3:7a284390b0ce 23 * - Neither the name of ARM LIMITED nor the names of its contributors
mbed_official 3:7a284390b0ce 24 * may be used to endorse or promote products derived from this
mbed_official 3:7a284390b0ce 25 * software without specific prior written permission.
mbed_official 3:7a284390b0ce 26 *
mbed_official 3:7a284390b0ce 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
mbed_official 3:7a284390b0ce 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
mbed_official 3:7a284390b0ce 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
mbed_official 3:7a284390b0ce 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
mbed_official 3:7a284390b0ce 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
mbed_official 3:7a284390b0ce 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
mbed_official 3:7a284390b0ce 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
mbed_official 3:7a284390b0ce 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 3:7a284390b0ce 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
mbed_official 3:7a284390b0ce 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
mbed_official 3:7a284390b0ce 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
mbed_official 3:7a284390b0ce 38 * POSSIBILITY OF SUCH DAMAGE.
emilmont 1:fdd22bb7aa52 39 * ---------------------------------------------------------------------------- */
emilmont 1:fdd22bb7aa52 40
emilmont 1:fdd22bb7aa52 41 #include "arm_math.h"
emilmont 1:fdd22bb7aa52 42
emilmont 1:fdd22bb7aa52 43 /**
emilmont 1:fdd22bb7aa52 44 * @ingroup groupMath
emilmont 1:fdd22bb7aa52 45 */
emilmont 1:fdd22bb7aa52 46
emilmont 1:fdd22bb7aa52 47 /**
emilmont 1:fdd22bb7aa52 48 * @defgroup negate Vector Negate
emilmont 1:fdd22bb7aa52 49 *
emilmont 1:fdd22bb7aa52 50 * Negates the elements of a vector.
emilmont 1:fdd22bb7aa52 51 *
emilmont 1:fdd22bb7aa52 52 * <pre>
emilmont 1:fdd22bb7aa52 53 * pDst[n] = -pSrc[n], 0 <= n < blockSize.
emilmont 1:fdd22bb7aa52 54 * </pre>
mbed_official 3:7a284390b0ce 55 *
mbed_official 3:7a284390b0ce 56 * The functions support in-place computation allowing the source and
mbed_official 3:7a284390b0ce 57 * destination pointers to reference the same memory buffer.
mbed_official 3:7a284390b0ce 58 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
emilmont 1:fdd22bb7aa52 59 */
emilmont 1:fdd22bb7aa52 60
emilmont 1:fdd22bb7aa52 61 /**
emilmont 1:fdd22bb7aa52 62 * @addtogroup negate
emilmont 1:fdd22bb7aa52 63 * @{
emilmont 1:fdd22bb7aa52 64 */
emilmont 1:fdd22bb7aa52 65
emilmont 1:fdd22bb7aa52 66 /**
emilmont 1:fdd22bb7aa52 67 * @brief Negates the elements of a floating-point vector.
emilmont 1:fdd22bb7aa52 68 * @param[in] *pSrc points to the input vector
emilmont 1:fdd22bb7aa52 69 * @param[out] *pDst points to the output vector
emilmont 1:fdd22bb7aa52 70 * @param[in] blockSize number of samples in the vector
emilmont 1:fdd22bb7aa52 71 * @return none.
emilmont 1:fdd22bb7aa52 72 */
emilmont 1:fdd22bb7aa52 73
emilmont 1:fdd22bb7aa52 74 void arm_negate_f32(
emilmont 1:fdd22bb7aa52 75 float32_t * pSrc,
emilmont 1:fdd22bb7aa52 76 float32_t * pDst,
emilmont 1:fdd22bb7aa52 77 uint32_t blockSize)
emilmont 1:fdd22bb7aa52 78 {
emilmont 1:fdd22bb7aa52 79 uint32_t blkCnt; /* loop counter */
emilmont 1:fdd22bb7aa52 80
emilmont 1:fdd22bb7aa52 81
mbed_official 3:7a284390b0ce 82 #ifndef ARM_MATH_CM0_FAMILY
emilmont 1:fdd22bb7aa52 83
emilmont 1:fdd22bb7aa52 84 /* Run the below code for Cortex-M4 and Cortex-M3 */
emilmont 1:fdd22bb7aa52 85 float32_t in1, in2, in3, in4; /* temporary variables */
emilmont 1:fdd22bb7aa52 86
emilmont 1:fdd22bb7aa52 87 /*loop Unrolling */
emilmont 1:fdd22bb7aa52 88 blkCnt = blockSize >> 2u;
emilmont 1:fdd22bb7aa52 89
emilmont 1:fdd22bb7aa52 90 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emilmont 1:fdd22bb7aa52 91 ** a second loop below computes the remaining 1 to 3 samples. */
emilmont 1:fdd22bb7aa52 92 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 93 {
emilmont 1:fdd22bb7aa52 94 /* read inputs from source */
emilmont 1:fdd22bb7aa52 95 in1 = *pSrc;
emilmont 1:fdd22bb7aa52 96 in2 = *(pSrc + 1);
emilmont 1:fdd22bb7aa52 97 in3 = *(pSrc + 2);
emilmont 1:fdd22bb7aa52 98 in4 = *(pSrc + 3);
emilmont 1:fdd22bb7aa52 99
emilmont 1:fdd22bb7aa52 100 /* negate the input */
emilmont 1:fdd22bb7aa52 101 in1 = -in1;
emilmont 1:fdd22bb7aa52 102 in2 = -in2;
emilmont 1:fdd22bb7aa52 103 in3 = -in3;
emilmont 1:fdd22bb7aa52 104 in4 = -in4;
emilmont 1:fdd22bb7aa52 105
emilmont 1:fdd22bb7aa52 106 /* store the result to destination */
emilmont 1:fdd22bb7aa52 107 *pDst = in1;
emilmont 1:fdd22bb7aa52 108 *(pDst + 1) = in2;
emilmont 1:fdd22bb7aa52 109 *(pDst + 2) = in3;
emilmont 1:fdd22bb7aa52 110 *(pDst + 3) = in4;
emilmont 1:fdd22bb7aa52 111
emilmont 1:fdd22bb7aa52 112 /* update pointers to process next samples */
emilmont 1:fdd22bb7aa52 113 pSrc += 4u;
emilmont 1:fdd22bb7aa52 114 pDst += 4u;
emilmont 1:fdd22bb7aa52 115
emilmont 1:fdd22bb7aa52 116 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 117 blkCnt--;
emilmont 1:fdd22bb7aa52 118 }
emilmont 1:fdd22bb7aa52 119
emilmont 1:fdd22bb7aa52 120 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
emilmont 1:fdd22bb7aa52 121 ** No loop unrolling is used. */
emilmont 1:fdd22bb7aa52 122 blkCnt = blockSize % 0x4u;
emilmont 1:fdd22bb7aa52 123
emilmont 1:fdd22bb7aa52 124 #else
emilmont 1:fdd22bb7aa52 125
emilmont 1:fdd22bb7aa52 126 /* Run the below code for Cortex-M0 */
emilmont 1:fdd22bb7aa52 127
emilmont 1:fdd22bb7aa52 128 /* Initialize blkCnt with number of samples */
emilmont 1:fdd22bb7aa52 129 blkCnt = blockSize;
emilmont 1:fdd22bb7aa52 130
mbed_official 3:7a284390b0ce 131 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emilmont 1:fdd22bb7aa52 132
emilmont 1:fdd22bb7aa52 133 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 134 {
emilmont 1:fdd22bb7aa52 135 /* C = -A */
emilmont 1:fdd22bb7aa52 136 /* Negate and then store the results in the destination buffer. */
emilmont 1:fdd22bb7aa52 137 *pDst++ = -*pSrc++;
emilmont 1:fdd22bb7aa52 138
emilmont 1:fdd22bb7aa52 139 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 140 blkCnt--;
emilmont 1:fdd22bb7aa52 141 }
emilmont 1:fdd22bb7aa52 142 }
emilmont 1:fdd22bb7aa52 143
emilmont 1:fdd22bb7aa52 144 /**
emilmont 1:fdd22bb7aa52 145 * @} end of negate group
emilmont 1:fdd22bb7aa52 146 */