diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q15.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q15.c | 149 |
1 files changed, 57 insertions, 92 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q15.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q15.c index ec47fff0b..eb944ced9 100644 --- a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q15.c +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_abs_q15.c @@ -3,13 +3,13 @@ * Title: arm_abs_q15.c * Description: Q15 vector absolute value * - * $Date: 27. January 2017 - * $Revision: V.1.5.1 + * $Date: 18. March 2019 + * $Revision: V1.6.0 * * Target Processor: Cortex-M cores * -------------------------------------------------------------------- */ /* - * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. + * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved. * * SPDX-License-Identifier: Apache-2.0 * @@ -29,139 +29,104 @@ #include "arm_math.h" /** - * @ingroup groupMath + @ingroup groupMath */ /** - * @addtogroup BasicAbs - * @{ + @addtogroup BasicAbs + @{ */ /** - * @brief Q15 vector absolute value. - * @param[in] *pSrc points to the input buffer - * @param[out] *pDst points to the output buffer - * @param[in] blockSize number of samples in each vector - * @return none. - * - * <b>Scaling and Overflow Behavior:</b> - * \par - * The function uses saturating arithmetic. - * The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF. + @brief Q15 vector absolute value. + @param[in] pSrc points to the input vector + @param[out] pDst points to the output vector + @param[in] blockSize number of samples in each vector + @return none + + @par Scaling and Overflow Behavior + The function uses saturating arithmetic. + The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF. */ void arm_abs_q15( - q15_t * pSrc, - q15_t * pDst, - uint32_t blockSize) + const q15_t * pSrc, + q15_t * pDst, + uint32_t blockSize) { - uint32_t blkCnt; /* loop counter */ - -#if defined (ARM_MATH_DSP) - __SIMD32_TYPE *simd; + uint32_t blkCnt; /* Loop counter */ + q15_t in; /* Temporary input variable */ -/* Run the below code for Cortex-M4 and Cortex-M3 */ +#if defined (ARM_MATH_LOOPUNROLL) - q15_t in1; /* Input value1 */ - q15_t in2; /* Input value2 */ - - - /*loop Unrolling */ + /* Loop unrolling: Compute 4 outputs at a time */ blkCnt = blockSize >> 2U; - /* First part of the processing with loop unrolling. Compute 4 outputs at a time. - ** a second loop below computes the remaining 1 to 3 samples. */ - simd = __SIMD32_CONST(pDst); while (blkCnt > 0U) { /* C = |A| */ - /* Read two inputs */ - in1 = *pSrc++; - in2 = *pSrc++; - - - /* Store the Absolute result in the destination buffer by packing the two values, in a single cycle */ -#ifndef ARM_MATH_BIG_ENDIAN - *simd++ = - __PKHBT(((in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1)), - ((in2 > 0) ? in2 : (q15_t)__QSUB16(0, in2)), 16); + /* Calculate absolute of input (if -1 then saturated to 0x7fff) and store result in destination buffer. */ + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q15_t)__QSUB16(0, in); #else + *pDst++ = (in > 0) ? in : ((in == (q15_t) 0x8000) ? 0x7fff : -in); +#endif - - *simd++ = - __PKHBT(((in2 > 0) ? in2 : (q15_t)__QSUB16(0, in2)), - ((in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1)), 16); - -#endif /* #ifndef ARM_MATH_BIG_ENDIAN */ - - in1 = *pSrc++; - in2 = *pSrc++; - - -#ifndef ARM_MATH_BIG_ENDIAN - - *simd++ = - __PKHBT(((in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1)), - ((in2 > 0) ? in2 : (q15_t)__QSUB16(0, in2)), 16); - + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q15_t)__QSUB16(0, in); #else + *pDst++ = (in > 0) ? in : ((in == (q15_t) 0x8000) ? 0x7fff : -in); +#endif + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q15_t)__QSUB16(0, in); +#else + *pDst++ = (in > 0) ? in : ((in == (q15_t) 0x8000) ? 0x7fff : -in); +#endif - *simd++ = - __PKHBT(((in2 > 0) ? in2 : (q15_t)__QSUB16(0, in2)), - ((in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1)), 16); - -#endif /* #ifndef ARM_MATH_BIG_ENDIAN */ + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q15_t)__QSUB16(0, in); +#else + *pDst++ = (in > 0) ? in : ((in == (q15_t) 0x8000) ? 0x7fff : -in); +#endif - /* Decrement the loop counter */ + /* Decrement loop counter */ blkCnt--; } - pDst = (q15_t *)simd; - /* If the blockSize is not a multiple of 4, compute any remaining output samples here. - ** No loop unrolling is used. */ + /* Loop unrolling: Compute remaining outputs */ blkCnt = blockSize % 0x4U; - while (blkCnt > 0U) - { - /* C = |A| */ - /* Read the input */ - in1 = *pSrc++; - - /* Calculate absolute value of input and then store the result in the destination buffer. */ - *pDst++ = (in1 > 0) ? in1 : (q15_t)__QSUB16(0, in1); - - /* Decrement the loop counter */ - blkCnt--; - } - #else - /* Run the below code for Cortex-M0 */ - - q15_t in; /* Temporary input variable */ - /* Initialize blkCnt with number of samples */ blkCnt = blockSize; +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ + while (blkCnt > 0U) { /* C = |A| */ - /* Read the input */ - in = *pSrc++; - /* Calculate absolute value of input and then store the result in the destination buffer. */ + /* Calculate absolute of input (if -1 then saturated to 0x7fff) and store result in destination buffer. */ + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = (in > 0) ? in : (q15_t)__QSUB16(0, in); +#else *pDst++ = (in > 0) ? in : ((in == (q15_t) 0x8000) ? 0x7fff : -in); +#endif - /* Decrement the loop counter */ + /* Decrement loop counter */ blkCnt--; } -#endif /* #if defined (ARM_MATH_DSP) */ - } /** - * @} end of BasicAbs group + @} end of BasicAbs group */ |