John Garlitos / Mbed OS EVAL-CN0540-ARDZ

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Dependencies:   platform_drivers LTC26X6 AD77681

CMSIS-DSP_Lib/Source/BasicMathFunctions/arm_shift_q15.c@1:9dd7c64b4a64, 2021-12-06 (annotated)

Committer:
jngarlitos
Date:
Mon Dec 06 05:22:28 2021 +0000
Revision:
1:9dd7c64b4a64
EVAL-CN0540-ARDZ mbed example program Initial Commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jngarlitos 1:9dd7c64b4a64 1 /* ----------------------------------------------------------------------
jngarlitos 1:9dd7c64b4a64 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
jngarlitos 1:9dd7c64b4a64 3 *
jngarlitos 1:9dd7c64b4a64 4 * $Date: 19. March 2015
jngarlitos 1:9dd7c64b4a64 5 * $Revision: V.1.4.5
jngarlitos 1:9dd7c64b4a64 6 *
jngarlitos 1:9dd7c64b4a64 7 * Project: CMSIS DSP Library
jngarlitos 1:9dd7c64b4a64 8 * Title: arm_shift_q15.c
jngarlitos 1:9dd7c64b4a64 9 *
jngarlitos 1:9dd7c64b4a64 10 * Description: Shifts the elements of a Q15 vector by a specified number of bits.
jngarlitos 1:9dd7c64b4a64 11 *
jngarlitos 1:9dd7c64b4a64 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
jngarlitos 1:9dd7c64b4a64 13 *
jngarlitos 1:9dd7c64b4a64 14 * Redistribution and use in source and binary forms, with or without
jngarlitos 1:9dd7c64b4a64 15 * modification, are permitted provided that the following conditions
jngarlitos 1:9dd7c64b4a64 16 * are met:
jngarlitos 1:9dd7c64b4a64 17 * - Redistributions of source code must retain the above copyright
jngarlitos 1:9dd7c64b4a64 18 * notice, this list of conditions and the following disclaimer.
jngarlitos 1:9dd7c64b4a64 19 * - Redistributions in binary form must reproduce the above copyright
jngarlitos 1:9dd7c64b4a64 20 * notice, this list of conditions and the following disclaimer in
jngarlitos 1:9dd7c64b4a64 21 * the documentation and/or other materials provided with the
jngarlitos 1:9dd7c64b4a64 22 * distribution.
jngarlitos 1:9dd7c64b4a64 23 * - Neither the name of ARM LIMITED nor the names of its contributors
jngarlitos 1:9dd7c64b4a64 24 * may be used to endorse or promote products derived from this
jngarlitos 1:9dd7c64b4a64 25 * software without specific prior written permission.
jngarlitos 1:9dd7c64b4a64 26 *
jngarlitos 1:9dd7c64b4a64 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
jngarlitos 1:9dd7c64b4a64 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
jngarlitos 1:9dd7c64b4a64 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
jngarlitos 1:9dd7c64b4a64 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
jngarlitos 1:9dd7c64b4a64 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
jngarlitos 1:9dd7c64b4a64 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
jngarlitos 1:9dd7c64b4a64 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
jngarlitos 1:9dd7c64b4a64 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
jngarlitos 1:9dd7c64b4a64 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
jngarlitos 1:9dd7c64b4a64 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
jngarlitos 1:9dd7c64b4a64 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
jngarlitos 1:9dd7c64b4a64 38 * POSSIBILITY OF SUCH DAMAGE.
jngarlitos 1:9dd7c64b4a64 39 * -------------------------------------------------------------------- */
jngarlitos 1:9dd7c64b4a64 40
jngarlitos 1:9dd7c64b4a64 41 #include "arm_math.h"
jngarlitos 1:9dd7c64b4a64 42
jngarlitos 1:9dd7c64b4a64 43 /**
jngarlitos 1:9dd7c64b4a64 44 * @ingroup groupMath
jngarlitos 1:9dd7c64b4a64 45 */
jngarlitos 1:9dd7c64b4a64 46
jngarlitos 1:9dd7c64b4a64 47 /**
jngarlitos 1:9dd7c64b4a64 48 * @addtogroup shift
jngarlitos 1:9dd7c64b4a64 49 * @{
jngarlitos 1:9dd7c64b4a64 50 */
jngarlitos 1:9dd7c64b4a64 51
jngarlitos 1:9dd7c64b4a64 52 /**
jngarlitos 1:9dd7c64b4a64 53 * @brief Shifts the elements of a Q15 vector a specified number of bits.
jngarlitos 1:9dd7c64b4a64 54 * @param[in] *pSrc points to the input vector
jngarlitos 1:9dd7c64b4a64 55 * @param[in] shiftBits number of bits to shift. A positive value shifts left; a negative value shifts right.
jngarlitos 1:9dd7c64b4a64 56 * @param[out] *pDst points to the output vector
jngarlitos 1:9dd7c64b4a64 57 * @param[in] blockSize number of samples in the vector
jngarlitos 1:9dd7c64b4a64 58 * @return none.
jngarlitos 1:9dd7c64b4a64 59 *
jngarlitos 1:9dd7c64b4a64 60 * <b>Scaling and Overflow Behavior:</b>
jngarlitos 1:9dd7c64b4a64 61 * \par
jngarlitos 1:9dd7c64b4a64 62 * The function uses saturating arithmetic.
jngarlitos 1:9dd7c64b4a64 63 * Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated.
jngarlitos 1:9dd7c64b4a64 64 */
jngarlitos 1:9dd7c64b4a64 65
jngarlitos 1:9dd7c64b4a64 66 void arm_shift_q15(
jngarlitos 1:9dd7c64b4a64 67 q15_t * pSrc,
jngarlitos 1:9dd7c64b4a64 68 int8_t shiftBits,
jngarlitos 1:9dd7c64b4a64 69 q15_t * pDst,
jngarlitos 1:9dd7c64b4a64 70 uint32_t blockSize)
jngarlitos 1:9dd7c64b4a64 71 {
jngarlitos 1:9dd7c64b4a64 72 uint32_t blkCnt; /* loop counter */
jngarlitos 1:9dd7c64b4a64 73 uint8_t sign; /* Sign of shiftBits */
jngarlitos 1:9dd7c64b4a64 74
jngarlitos 1:9dd7c64b4a64 75 #ifndef ARM_MATH_CM0_FAMILY
jngarlitos 1:9dd7c64b4a64 76
jngarlitos 1:9dd7c64b4a64 77 /* Run the below code for Cortex-M4 and Cortex-M3 */
jngarlitos 1:9dd7c64b4a64 78
jngarlitos 1:9dd7c64b4a64 79 q15_t in1, in2; /* Temporary variables */
jngarlitos 1:9dd7c64b4a64 80
jngarlitos 1:9dd7c64b4a64 81
jngarlitos 1:9dd7c64b4a64 82 /*loop Unrolling */
jngarlitos 1:9dd7c64b4a64 83 blkCnt = blockSize >> 2u;
jngarlitos 1:9dd7c64b4a64 84
jngarlitos 1:9dd7c64b4a64 85 /* Getting the sign of shiftBits */
jngarlitos 1:9dd7c64b4a64 86 sign = (shiftBits & 0x80);
jngarlitos 1:9dd7c64b4a64 87
jngarlitos 1:9dd7c64b4a64 88 /* If the shift value is positive then do right shift else left shift */
jngarlitos 1:9dd7c64b4a64 89 if(sign == 0u)
jngarlitos 1:9dd7c64b4a64 90 {
jngarlitos 1:9dd7c64b4a64 91 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
jngarlitos 1:9dd7c64b4a64 92 ** a second loop below computes the remaining 1 to 3 samples. */
jngarlitos 1:9dd7c64b4a64 93 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 94 {
jngarlitos 1:9dd7c64b4a64 95 /* Read 2 inputs */
jngarlitos 1:9dd7c64b4a64 96 in1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 97 in2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 98 /* C = A << shiftBits */
jngarlitos 1:9dd7c64b4a64 99 /* Shift the inputs and then store the results in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 100 #ifndef ARM_MATH_BIG_ENDIAN
jngarlitos 1:9dd7c64b4a64 101
jngarlitos 1:9dd7c64b4a64 102 *__SIMD32(pDst)++ = __PKHBT(__SSAT((in1 << shiftBits), 16),
jngarlitos 1:9dd7c64b4a64 103 __SSAT((in2 << shiftBits), 16), 16);
jngarlitos 1:9dd7c64b4a64 104
jngarlitos 1:9dd7c64b4a64 105 #else
jngarlitos 1:9dd7c64b4a64 106
jngarlitos 1:9dd7c64b4a64 107 *__SIMD32(pDst)++ = __PKHBT(__SSAT((in2 << shiftBits), 16),
jngarlitos 1:9dd7c64b4a64 108 __SSAT((in1 << shiftBits), 16), 16);
jngarlitos 1:9dd7c64b4a64 109
jngarlitos 1:9dd7c64b4a64 110 #endif /* #ifndef ARM_MATH_BIG_ENDIAN */
jngarlitos 1:9dd7c64b4a64 111
jngarlitos 1:9dd7c64b4a64 112 in1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 113 in2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 114
jngarlitos 1:9dd7c64b4a64 115 #ifndef ARM_MATH_BIG_ENDIAN
jngarlitos 1:9dd7c64b4a64 116
jngarlitos 1:9dd7c64b4a64 117 *__SIMD32(pDst)++ = __PKHBT(__SSAT((in1 << shiftBits), 16),
jngarlitos 1:9dd7c64b4a64 118 __SSAT((in2 << shiftBits), 16), 16);
jngarlitos 1:9dd7c64b4a64 119
jngarlitos 1:9dd7c64b4a64 120 #else
jngarlitos 1:9dd7c64b4a64 121
jngarlitos 1:9dd7c64b4a64 122 *__SIMD32(pDst)++ = __PKHBT(__SSAT((in2 << shiftBits), 16),
jngarlitos 1:9dd7c64b4a64 123 __SSAT((in1 << shiftBits), 16), 16);
jngarlitos 1:9dd7c64b4a64 124
jngarlitos 1:9dd7c64b4a64 125 #endif /* #ifndef ARM_MATH_BIG_ENDIAN */
jngarlitos 1:9dd7c64b4a64 126
jngarlitos 1:9dd7c64b4a64 127 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 128 blkCnt--;
jngarlitos 1:9dd7c64b4a64 129 }
jngarlitos 1:9dd7c64b4a64 130
jngarlitos 1:9dd7c64b4a64 131 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
jngarlitos 1:9dd7c64b4a64 132 ** No loop unrolling is used. */
jngarlitos 1:9dd7c64b4a64 133 blkCnt = blockSize % 0x4u;
jngarlitos 1:9dd7c64b4a64 134
jngarlitos 1:9dd7c64b4a64 135 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 136 {
jngarlitos 1:9dd7c64b4a64 137 /* C = A << shiftBits */
jngarlitos 1:9dd7c64b4a64 138 /* Shift and then store the results in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 139 *pDst++ = __SSAT((*pSrc++ << shiftBits), 16);
jngarlitos 1:9dd7c64b4a64 140
jngarlitos 1:9dd7c64b4a64 141 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 142 blkCnt--;
jngarlitos 1:9dd7c64b4a64 143 }
jngarlitos 1:9dd7c64b4a64 144 }
jngarlitos 1:9dd7c64b4a64 145 else
jngarlitos 1:9dd7c64b4a64 146 {
jngarlitos 1:9dd7c64b4a64 147 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
jngarlitos 1:9dd7c64b4a64 148 ** a second loop below computes the remaining 1 to 3 samples. */
jngarlitos 1:9dd7c64b4a64 149 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 150 {
jngarlitos 1:9dd7c64b4a64 151 /* Read 2 inputs */
jngarlitos 1:9dd7c64b4a64 152 in1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 153 in2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 154
jngarlitos 1:9dd7c64b4a64 155 /* C = A >> shiftBits */
jngarlitos 1:9dd7c64b4a64 156 /* Shift the inputs and then store the results in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 157 #ifndef ARM_MATH_BIG_ENDIAN
jngarlitos 1:9dd7c64b4a64 158
jngarlitos 1:9dd7c64b4a64 159 *__SIMD32(pDst)++ = __PKHBT((in1 >> -shiftBits),
jngarlitos 1:9dd7c64b4a64 160 (in2 >> -shiftBits), 16);
jngarlitos 1:9dd7c64b4a64 161
jngarlitos 1:9dd7c64b4a64 162 #else
jngarlitos 1:9dd7c64b4a64 163
jngarlitos 1:9dd7c64b4a64 164 *__SIMD32(pDst)++ = __PKHBT((in2 >> -shiftBits),
jngarlitos 1:9dd7c64b4a64 165 (in1 >> -shiftBits), 16);
jngarlitos 1:9dd7c64b4a64 166
jngarlitos 1:9dd7c64b4a64 167 #endif /* #ifndef ARM_MATH_BIG_ENDIAN */
jngarlitos 1:9dd7c64b4a64 168
jngarlitos 1:9dd7c64b4a64 169 in1 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 170 in2 = *pSrc++;
jngarlitos 1:9dd7c64b4a64 171
jngarlitos 1:9dd7c64b4a64 172 #ifndef ARM_MATH_BIG_ENDIAN
jngarlitos 1:9dd7c64b4a64 173
jngarlitos 1:9dd7c64b4a64 174 *__SIMD32(pDst)++ = __PKHBT((in1 >> -shiftBits),
jngarlitos 1:9dd7c64b4a64 175 (in2 >> -shiftBits), 16);
jngarlitos 1:9dd7c64b4a64 176
jngarlitos 1:9dd7c64b4a64 177 #else
jngarlitos 1:9dd7c64b4a64 178
jngarlitos 1:9dd7c64b4a64 179 *__SIMD32(pDst)++ = __PKHBT((in2 >> -shiftBits),
jngarlitos 1:9dd7c64b4a64 180 (in1 >> -shiftBits), 16);
jngarlitos 1:9dd7c64b4a64 181
jngarlitos 1:9dd7c64b4a64 182 #endif /* #ifndef ARM_MATH_BIG_ENDIAN */
jngarlitos 1:9dd7c64b4a64 183
jngarlitos 1:9dd7c64b4a64 184 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 185 blkCnt--;
jngarlitos 1:9dd7c64b4a64 186 }
jngarlitos 1:9dd7c64b4a64 187
jngarlitos 1:9dd7c64b4a64 188 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
jngarlitos 1:9dd7c64b4a64 189 ** No loop unrolling is used. */
jngarlitos 1:9dd7c64b4a64 190 blkCnt = blockSize % 0x4u;
jngarlitos 1:9dd7c64b4a64 191
jngarlitos 1:9dd7c64b4a64 192 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 193 {
jngarlitos 1:9dd7c64b4a64 194 /* C = A >> shiftBits */
jngarlitos 1:9dd7c64b4a64 195 /* Shift the inputs and then store the results in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 196 *pDst++ = (*pSrc++ >> -shiftBits);
jngarlitos 1:9dd7c64b4a64 197
jngarlitos 1:9dd7c64b4a64 198 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 199 blkCnt--;
jngarlitos 1:9dd7c64b4a64 200 }
jngarlitos 1:9dd7c64b4a64 201 }
jngarlitos 1:9dd7c64b4a64 202
jngarlitos 1:9dd7c64b4a64 203 #else
jngarlitos 1:9dd7c64b4a64 204
jngarlitos 1:9dd7c64b4a64 205 /* Run the below code for Cortex-M0 */
jngarlitos 1:9dd7c64b4a64 206
jngarlitos 1:9dd7c64b4a64 207 /* Getting the sign of shiftBits */
jngarlitos 1:9dd7c64b4a64 208 sign = (shiftBits & 0x80);
jngarlitos 1:9dd7c64b4a64 209
jngarlitos 1:9dd7c64b4a64 210 /* If the shift value is positive then do right shift else left shift */
jngarlitos 1:9dd7c64b4a64 211 if(sign == 0u)
jngarlitos 1:9dd7c64b4a64 212 {
jngarlitos 1:9dd7c64b4a64 213 /* Initialize blkCnt with number of samples */
jngarlitos 1:9dd7c64b4a64 214 blkCnt = blockSize;
jngarlitos 1:9dd7c64b4a64 215
jngarlitos 1:9dd7c64b4a64 216 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 217 {
jngarlitos 1:9dd7c64b4a64 218 /* C = A << shiftBits */
jngarlitos 1:9dd7c64b4a64 219 /* Shift and then store the results in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 220 *pDst++ = __SSAT(((q31_t) * pSrc++ << shiftBits), 16);
jngarlitos 1:9dd7c64b4a64 221
jngarlitos 1:9dd7c64b4a64 222 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 223 blkCnt--;
jngarlitos 1:9dd7c64b4a64 224 }
jngarlitos 1:9dd7c64b4a64 225 }
jngarlitos 1:9dd7c64b4a64 226 else
jngarlitos 1:9dd7c64b4a64 227 {
jngarlitos 1:9dd7c64b4a64 228 /* Initialize blkCnt with number of samples */
jngarlitos 1:9dd7c64b4a64 229 blkCnt = blockSize;
jngarlitos 1:9dd7c64b4a64 230
jngarlitos 1:9dd7c64b4a64 231 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 232 {
jngarlitos 1:9dd7c64b4a64 233 /* C = A >> shiftBits */
jngarlitos 1:9dd7c64b4a64 234 /* Shift the inputs and then store the results in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 235 *pDst++ = (*pSrc++ >> -shiftBits);
jngarlitos 1:9dd7c64b4a64 236
jngarlitos 1:9dd7c64b4a64 237 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 238 blkCnt--;
jngarlitos 1:9dd7c64b4a64 239 }
jngarlitos 1:9dd7c64b4a64 240 }
jngarlitos 1:9dd7c64b4a64 241
jngarlitos 1:9dd7c64b4a64 242 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
jngarlitos 1:9dd7c64b4a64 243
jngarlitos 1:9dd7c64b4a64 244 }
jngarlitos 1:9dd7c64b4a64 245
jngarlitos 1:9dd7c64b4a64 246 /**
jngarlitos 1:9dd7c64b4a64 247 * @} end of shift group
jngarlitos 1:9dd7c64b4a64 248 */