diff options
Diffstat (limited to 'DSP/Source/SupportFunctions/arm_fill_q15.c')
| -rw-r--r-- | DSP/Source/SupportFunctions/arm_fill_q15.c | 64 |
1 files changed, 28 insertions, 36 deletions
diff --git a/DSP/Source/SupportFunctions/arm_fill_q15.c b/DSP/Source/SupportFunctions/arm_fill_q15.c index 27eb42c..d8c0f8d 100644 --- a/DSP/Source/SupportFunctions/arm_fill_q15.c +++ b/DSP/Source/SupportFunctions/arm_fill_q15.c @@ -3,13 +3,13 @@ * Title: arm_fill_q15.c * Description: Fills a constant value into a Q15 vector * - * $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 * @@ -29,21 +29,20 @@ #include "arm_math.h" /** - * @ingroup groupSupport + @ingroup groupSupport */ /** - * @addtogroup Fill - * @{ + @addtogroup Fill + @{ */ /** - * @brief Fills a constant value into a Q15 vector. - * @param[in] value input value to be filled - * @param[out] *pDst points to output vector - * @param[in] blockSize length of the output vector - * @return none. - * + @brief Fills a constant value into a Q15 vector. + @param[in] value input value to be filled + @param[out] pDst points to output vector + @param[in] blockSize number of samples in each vector + @return none */ void arm_fill_q15( @@ -51,58 +50,51 @@ void arm_fill_q15( q15_t * pDst, uint32_t blockSize) { - uint32_t blkCnt; /* loop counter */ - -#if defined (ARM_MATH_DSP) - - /* Run the below code for Cortex-M4 and Cortex-M3 */ + uint32_t blkCnt; /* Loop counter */ +#if defined (ARM_MATH_LOOPUNROLL) q31_t packedValue; /* value packed to 32 bits */ - - /*loop Unrolling */ - blkCnt = blockSize >> 2U; - /* Packing two 16 bit values to 32 bit value in order to use SIMD */ packedValue = __PKHBT(value, value, 16U); - /* 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. */ + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + while (blkCnt > 0U) { /* C = value */ - /* Fill the value in the destination buffer */ - *__SIMD32(pDst)++ = packedValue; - *__SIMD32(pDst)++ = packedValue; - /* Decrement the loop counter */ + /* fill 2 times 2 samples at a time */ + write_q15x2_ia (&pDst, packedValue); + write_q15x2_ia (&pDst, packedValue); + + /* 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 */ - - /* Loop over blockSize number of values */ + /* Initialize blkCnt with number of samples */ blkCnt = blockSize; -#endif /* #if defined (ARM_MATH_DSP) */ +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ while (blkCnt > 0U) { /* C = value */ - /* Fill the value in the destination buffer */ + + /* Fill value in destination buffer */ *pDst++ = value; - /* Decrement the loop counter */ + /* Decrement loop counter */ blkCnt--; } } /** - * @} end of Fill group + @} end of Fill group */ |