diff options
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q31.c')
| -rw-r--r-- | Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q31.c | 113 |
1 files changed, 64 insertions, 49 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q31.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q31.c index 4a5a58d7b..645fb0ac0 100644 --- a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q31.c +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_negate_q31.c @@ -3,13 +3,13 @@ * Title: arm_negate_q31.c * Description: Negates Q31 vectors * - * $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 * @@ -29,89 +29,104 @@ #include "arm_math.h" /** - * @ingroup groupMath + @ingroup groupMath */ /** - * @addtogroup negate - * @{ + @addtogroup BasicNegate + @{ */ /** - * @brief Negates the elements of a Q31 vector. - * @param[in] *pSrc points to the input vector - * @param[out] *pDst points to the output vector - * @param[in] blockSize number of samples in the vector - * @return none. - * - * <b>Scaling and Overflow Behavior:</b> - * \par - * The function uses saturating arithmetic. - * The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF. + @brief Negates the elements of a Q31 vector. + @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 Q31 value -1 (0x80000000) is saturated to the maximum allowable positive value 0x7FFFFFFF. */ void arm_negate_q31( - q31_t * pSrc, - q31_t * pDst, - uint32_t blockSize) + const q31_t * pSrc, + q31_t * pDst, + uint32_t blockSize) { - q31_t in; /* Temporary variable */ - uint32_t blkCnt; /* loop counter */ - -#if defined (ARM_MATH_DSP) + uint32_t blkCnt; /* Loop counter */ + q31_t in; /* Temporary input variable */ -/* Run the below code for Cortex-M4 and Cortex-M3 */ - q31_t in1, in2, in3, in4; +#if defined (ARM_MATH_LOOPUNROLL) - /*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. */ while (blkCnt > 0U) { /* C = -A */ - /* Negate and then store the results in the destination buffer. */ - in1 = *pSrc++; - in2 = *pSrc++; - in3 = *pSrc++; - in4 = *pSrc++; - - *pDst++ = __QSUB(0, in1); - *pDst++ = __QSUB(0, in2); - *pDst++ = __QSUB(0, in3); - *pDst++ = __QSUB(0, in4); - - /* Decrement the loop counter */ + + /* Negate and store result in destination buffer. */ + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = __QSUB(0, in); +#else + *pDst++ = (in == INT32_MIN) ? INT32_MAX : -in; +#endif + + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = __QSUB(0, in); +#else + *pDst++ = (in == INT32_MIN) ? INT32_MAX : -in; +#endif + + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = __QSUB(0, in); +#else + *pDst++ = (in == INT32_MIN) ? INT32_MAX : -in; +#endif + + in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = __QSUB(0, in); +#else + *pDst++ = (in == INT32_MIN) ? INT32_MAX : -in; +#endif + + /* Decrement loop counter */ blkCnt--; } - /* 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; #else - /* Run the below code for Cortex-M0 */ - /* Initialize blkCnt with number of samples */ blkCnt = blockSize; -#endif /* #if defined (ARM_MATH_DSP) */ - +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ while (blkCnt > 0U) { /* C = -A */ - /* Negate and then store the result in the destination buffer. */ + + /* Negate and store result in destination buffer. */ in = *pSrc++; +#if defined (ARM_MATH_DSP) + *pDst++ = __QSUB(0, in); +#else *pDst++ = (in == INT32_MIN) ? INT32_MAX : -in; +#endif - /* Decrement the loop counter */ + /* Decrement loop counter */ blkCnt--; } + } /** - * @} end of negate group + @} end of BasicNegate group */ |