diff options
author | Clyne Sullivan <clyne@bitgloo.com> | 2025-01-29 21:34:25 -0500 |
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committer | Clyne Sullivan <clyne@bitgloo.com> | 2025-01-29 21:34:25 -0500 |
commit | 5b81bc8ccbd342b8566d88fc9f17a73aec03b5b6 (patch) | |
tree | cc57486912cfa74c6440d8b97c28f451ec787d78 /Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f16.c |
initial commit
Diffstat (limited to 'Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f16.c')
-rw-r--r-- | Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f16.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f16.c b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f16.c new file mode 100644 index 0000000..b4b1c33 --- /dev/null +++ b/Drivers/CMSIS/DSP/Source/BasicMathFunctions/arm_scale_f16.c @@ -0,0 +1,183 @@ +/* ---------------------------------------------------------------------- + * Project: CMSIS DSP Library + * Title: arm_scale_f16.c + * Description: Multiplies a floating-point vector by a scalar + * + * $Date: 23 April 2021 + * $Revision: V1.9.0 + * + * Target Processor: Cortex-M and Cortex-A cores + * -------------------------------------------------------------------- */ +/* + * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved. + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the License); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an AS IS BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "dsp/basic_math_functions_f16.h" + +/** + @ingroup groupMath + */ + +/** + @defgroup BasicScale Vector Scale + + Multiply a vector by a scalar value. For floating-point data, the algorithm used is: + + <pre> + pDst[n] = pSrc[n] * scale, 0 <= n < blockSize. + </pre> + + In the fixed-point Q7, Q15, and Q31 functions, <code>scale</code> is represented by + a fractional multiplication <code>scaleFract</code> and an arithmetic shift <code>shift</code>. + The shift allows the gain of the scaling operation to exceed 1.0. + The algorithm used with fixed-point data is: + + <pre> + pDst[n] = (pSrc[n] * scaleFract) << shift, 0 <= n < blockSize. + </pre> + + The overall scale factor applied to the fixed-point data is + <pre> + scale = scaleFract * 2^shift. + </pre> + + The functions support in-place computation allowing the source and destination + pointers to reference the same memory buffer. + */ + +/** + @addtogroup BasicScale + @{ + */ + +/** + @brief Multiplies a floating-point vector by a scalar. + @param[in] pSrc points to the input vector + @param[in] scale scale factor to be applied + @param[out] pDst points to the output vector + @param[in] blockSize number of samples in each vector + @return none + */ + +#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE) + +#include "arm_helium_utils.h" + +void arm_scale_f16( + const float16_t * pSrc, + float16_t scale, + float16_t * pDst, + uint32_t blockSize) +{ + uint32_t blkCnt; /* Loop counter */ + + f16x8_t vec1; + f16x8_t res; + + /* Compute 4 outputs at a time */ + blkCnt = blockSize >> 3U; + + while (blkCnt > 0U) + { + /* C = A + offset */ + + /* Add offset and then store the results in the destination buffer. */ + vec1 = vld1q(pSrc); + res = vmulq(vec1,scale); + vst1q(pDst, res); + + /* Increment pointers */ + pSrc += 8; + pDst += 8; + + /* Decrement the loop counter */ + blkCnt--; + } + + /* Tail */ + blkCnt = blockSize & 0x7; + + if (blkCnt > 0U) + { + mve_pred16_t p0 = vctp16q(blkCnt); + vec1 = vld1q((float16_t const *) pSrc); + vstrhq_p(pDst, vmulq(vec1, scale), p0); + } + + +} + +#else +#if defined(ARM_FLOAT16_SUPPORTED) +void arm_scale_f16( + const float16_t *pSrc, + float16_t scale, + float16_t *pDst, + uint32_t blockSize) +{ + uint32_t blkCnt; /* Loop counter */ + +#if defined (ARM_MATH_LOOPUNROLL) + + /* Loop unrolling: Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + + while (blkCnt > 0U) + { + /* C = A * scale */ + + /* Scale input and store result in destination buffer. */ + *pDst++ = (_Float16)(*pSrc++) * (_Float16)scale; + + *pDst++ = (_Float16)(*pSrc++) * (_Float16)scale; + + *pDst++ = (_Float16)(*pSrc++) * (_Float16)scale; + + *pDst++ = (_Float16)(*pSrc++) * (_Float16)scale; + + /* Decrement loop counter */ + blkCnt--; + } + + /* Loop unrolling: Compute remaining outputs */ + blkCnt = blockSize % 0x4U; + +#else + + /* Initialize blkCnt with number of samples */ + blkCnt = blockSize; + +#endif /* #if defined (ARM_MATH_LOOPUNROLL) */ + + while (blkCnt > 0U) + { + /* C = A * scale */ + + /* Scale input and store result in destination buffer. */ + *pDst++ = (_Float16)(*pSrc++) * (_Float16)scale; + + /* Decrement loop counter */ + blkCnt--; + } + +} +#endif +#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */ + +/** + @} end of BasicScale group + */ |