Laxmi Kant Tiwari / mbed-dsp

CMSIS DSP Lib

Fork of mbed-dsp by mbed official

cmsis_dsp/BasicMathFunctions/arm_abs_q7.c@4:9cee975aadce, 2014-06-23 (annotated)

Committer:
mbed_official
Date:
Mon Jun 23 09:30:09 2014 +0100
Revision:
4:9cee975aadce
Parent:
3:7a284390b0ce 
Synchronized with git revision 6e7c7bcec41226f536474daae3c13d49e4c0e865



Full URL: https://github.com/mbedmicro/mbed/commit/6e7c7bcec41226f536474daae3c13d49e4c0e865/



Fix signed unsigned compare in dsp library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emilmont 1:fdd22bb7aa52 1 /* ----------------------------------------------------------------------
mbed_official 3:7a284390b0ce 2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
emilmont 1:fdd22bb7aa52 3 *
mbed_official 3:7a284390b0ce 4 * $Date: 17. January 2013
mbed_official 3:7a284390b0ce 5 * $Revision: V1.4.1
emilmont 1:fdd22bb7aa52 6 *
emilmont 2:da51fb522205 7 * Project: CMSIS DSP Library
emilmont 2:da51fb522205 8 * Title: arm_abs_q7.c
emilmont 1:fdd22bb7aa52 9 *
emilmont 2:da51fb522205 10 * Description: Q7 vector absolute value.
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 * @addtogroup BasicAbs
emilmont 1:fdd22bb7aa52 49 * @{
emilmont 1:fdd22bb7aa52 50 */
emilmont 1:fdd22bb7aa52 51
emilmont 1:fdd22bb7aa52 52 /**
emilmont 1:fdd22bb7aa52 53 * @brief Q7 vector absolute value.
emilmont 1:fdd22bb7aa52 54 * @param[in] *pSrc points to the input buffer
emilmont 1:fdd22bb7aa52 55 * @param[out] *pDst points to the output buffer
emilmont 1:fdd22bb7aa52 56 * @param[in] blockSize number of samples in each vector
emilmont 1:fdd22bb7aa52 57 * @return none.
emilmont 1:fdd22bb7aa52 58 *
emilmont 1:fdd22bb7aa52 59 * \par Conditions for optimum performance
emilmont 1:fdd22bb7aa52 60 * Input and output buffers should be aligned by 32-bit
emilmont 1:fdd22bb7aa52 61 *
emilmont 1:fdd22bb7aa52 62 *
emilmont 1:fdd22bb7aa52 63 * <b>Scaling and Overflow Behavior:</b>
emilmont 1:fdd22bb7aa52 64 * \par
emilmont 1:fdd22bb7aa52 65 * The function uses saturating arithmetic.
emilmont 1:fdd22bb7aa52 66 * The Q7 value -1 (0x80) will be saturated to the maximum allowable positive value 0x7F.
emilmont 1:fdd22bb7aa52 67 */
emilmont 1:fdd22bb7aa52 68
emilmont 1:fdd22bb7aa52 69 void arm_abs_q7(
emilmont 1:fdd22bb7aa52 70 q7_t * pSrc,
emilmont 1:fdd22bb7aa52 71 q7_t * pDst,
emilmont 1:fdd22bb7aa52 72 uint32_t blockSize)
emilmont 1:fdd22bb7aa52 73 {
emilmont 1:fdd22bb7aa52 74 uint32_t blkCnt; /* loop counter */
emilmont 1:fdd22bb7aa52 75 q7_t in; /* Input value1 */
emilmont 1:fdd22bb7aa52 76
mbed_official 3:7a284390b0ce 77 #ifndef ARM_MATH_CM0_FAMILY
emilmont 1:fdd22bb7aa52 78
emilmont 1:fdd22bb7aa52 79 /* Run the below code for Cortex-M4 and Cortex-M3 */
emilmont 1:fdd22bb7aa52 80 q31_t in1, in2, in3, in4; /* temporary input variables */
emilmont 1:fdd22bb7aa52 81 q31_t out1, out2, out3, out4; /* temporary output variables */
emilmont 1:fdd22bb7aa52 82
emilmont 1:fdd22bb7aa52 83 /*loop Unrolling */
emilmont 1:fdd22bb7aa52 84 blkCnt = blockSize >> 2u;
emilmont 1:fdd22bb7aa52 85
emilmont 1:fdd22bb7aa52 86 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emilmont 1:fdd22bb7aa52 87 ** a second loop below computes the remaining 1 to 3 samples. */
emilmont 1:fdd22bb7aa52 88 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 89 {
emilmont 1:fdd22bb7aa52 90 /* C = |A| */
emilmont 1:fdd22bb7aa52 91 /* Read inputs */
emilmont 1:fdd22bb7aa52 92 in1 = (q31_t) * pSrc;
emilmont 1:fdd22bb7aa52 93 in2 = (q31_t) * (pSrc + 1);
emilmont 1:fdd22bb7aa52 94 in3 = (q31_t) * (pSrc + 2);
emilmont 1:fdd22bb7aa52 95
emilmont 1:fdd22bb7aa52 96 /* find absolute value */
mbed_official 3:7a284390b0ce 97 out1 = (in1 > 0) ? in1 : (q31_t)__QSUB8(0, in1);
emilmont 1:fdd22bb7aa52 98
emilmont 1:fdd22bb7aa52 99 /* read input */
emilmont 1:fdd22bb7aa52 100 in4 = (q31_t) * (pSrc + 3);
emilmont 1:fdd22bb7aa52 101
emilmont 1:fdd22bb7aa52 102 /* find absolute value */
mbed_official 3:7a284390b0ce 103 out2 = (in2 > 0) ? in2 : (q31_t)__QSUB8(0, in2);
emilmont 1:fdd22bb7aa52 104
emilmont 1:fdd22bb7aa52 105 /* store result to destination */
emilmont 1:fdd22bb7aa52 106 *pDst = (q7_t) out1;
emilmont 1:fdd22bb7aa52 107
emilmont 1:fdd22bb7aa52 108 /* find absolute value */
mbed_official 3:7a284390b0ce 109 out3 = (in3 > 0) ? in3 : (q31_t)__QSUB8(0, in3);
emilmont 1:fdd22bb7aa52 110
emilmont 1:fdd22bb7aa52 111 /* find absolute value */
mbed_official 3:7a284390b0ce 112 out4 = (in4 > 0) ? in4 : (q31_t)__QSUB8(0, in4);
emilmont 1:fdd22bb7aa52 113
emilmont 1:fdd22bb7aa52 114 /* store result to destination */
emilmont 1:fdd22bb7aa52 115 *(pDst + 1) = (q7_t) out2;
emilmont 1:fdd22bb7aa52 116
emilmont 1:fdd22bb7aa52 117 /* store result to destination */
emilmont 1:fdd22bb7aa52 118 *(pDst + 2) = (q7_t) out3;
emilmont 1:fdd22bb7aa52 119
emilmont 1:fdd22bb7aa52 120 /* store result to destination */
emilmont 1:fdd22bb7aa52 121 *(pDst + 3) = (q7_t) out4;
emilmont 1:fdd22bb7aa52 122
emilmont 1:fdd22bb7aa52 123 /* update pointers to process next samples */
emilmont 1:fdd22bb7aa52 124 pSrc += 4u;
emilmont 1:fdd22bb7aa52 125 pDst += 4u;
emilmont 1:fdd22bb7aa52 126
emilmont 1:fdd22bb7aa52 127 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 128 blkCnt--;
emilmont 1:fdd22bb7aa52 129 }
emilmont 1:fdd22bb7aa52 130
emilmont 1:fdd22bb7aa52 131 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
emilmont 1:fdd22bb7aa52 132 ** No loop unrolling is used. */
emilmont 1:fdd22bb7aa52 133 blkCnt = blockSize % 0x4u;
emilmont 1:fdd22bb7aa52 134 #else
emilmont 1:fdd22bb7aa52 135
emilmont 1:fdd22bb7aa52 136 /* Run the below code for Cortex-M0 */
emilmont 1:fdd22bb7aa52 137 blkCnt = blockSize;
emilmont 1:fdd22bb7aa52 138
mbed_official 3:7a284390b0ce 139 #endif // #define ARM_MATH_CM0_FAMILY
emilmont 1:fdd22bb7aa52 140
emilmont 1:fdd22bb7aa52 141 while(blkCnt > 0u)
emilmont 1:fdd22bb7aa52 142 {
emilmont 1:fdd22bb7aa52 143 /* C = |A| */
emilmont 1:fdd22bb7aa52 144 /* Read the input */
emilmont 1:fdd22bb7aa52 145 in = *pSrc++;
emilmont 1:fdd22bb7aa52 146
emilmont 1:fdd22bb7aa52 147 /* Store the Absolute result in the destination buffer */
emilmont 1:fdd22bb7aa52 148 *pDst++ = (in > 0) ? in : ((in == (q7_t) 0x80) ? 0x7f : -in);
emilmont 1:fdd22bb7aa52 149
emilmont 1:fdd22bb7aa52 150 /* Decrement the loop counter */
emilmont 1:fdd22bb7aa52 151 blkCnt--;
emilmont 1:fdd22bb7aa52 152 }
emilmont 1:fdd22bb7aa52 153 }
emilmont 1:fdd22bb7aa52 154
emilmont 1:fdd22bb7aa52 155 /**
emilmont 1:fdd22bb7aa52 156 * @} end of BasicAbs group
emilmont 1:fdd22bb7aa52 157 */