From 96d6da4e252b06dcfdc041e7df23e86161c33007 Mon Sep 17 00:00:00 2001 From: rihab kouki Date: Tue, 28 Jul 2020 11:24:49 +0100 Subject: Official ARM version: v5.6.0 --- DSP/Source/BasicMathFunctions/arm_sub_f32.c | 148 +++++++++++++++------------- 1 file changed, 79 insertions(+), 69 deletions(-) (limited to 'DSP/Source/BasicMathFunctions/arm_sub_f32.c') diff --git a/DSP/Source/BasicMathFunctions/arm_sub_f32.c b/DSP/Source/BasicMathFunctions/arm_sub_f32.c index 74a2944..4c97af3 100644 --- a/DSP/Source/BasicMathFunctions/arm_sub_f32.c +++ b/DSP/Source/BasicMathFunctions/arm_sub_f32.c @@ -1,15 +1,15 @@ /* ---------------------------------------------------------------------- * Project: CMSIS DSP Library * Title: arm_sub_f32.c - * Description: Floating-point vector subtraction. + * Description: Floating-point vector subtraction * - * $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 * @@ -29,110 +29,120 @@ #include "arm_math.h" /** - * @ingroup groupMath + @ingroup groupMath */ /** - * @defgroup BasicSub Vector Subtraction - * - * Element-by-element subtraction of two vectors. - * - * 
- *     pDst[n] = pSrcA[n] - pSrcB[n],   0 <= n < blockSize.
- *
- * - * There are separate functions for floating-point, Q7, Q15, and Q31 data types. + @defgroup BasicSub Vector Subtraction + + Element-by-element subtraction of two vectors. + + 
+      pDst[n] = pSrcA[n] - pSrcB[n],   0 <= n < blockSize.
+
+ + There are separate functions for floating-point, Q7, Q15, and Q31 data types. */ /** - * @addtogroup BasicSub - * @{ + @addtogroup BasicSub + @{ */ - /** - * @brief Floating-point vector subtraction. - * @param[in] *pSrcA points to the first input vector - * @param[in] *pSrcB points to the second input vector - * @param[out] *pDst points to the output vector - * @param[in] blockSize number of samples in each vector - * @return none. + @brief Floating-point vector subtraction. + @param[in] pSrcA points to the first input vector + @param[in] pSrcB points to the second input vector + @param[out] pDst points to the output vector + @param[in] blockSize number of samples in each vector + @return none */ void arm_sub_f32( - float32_t * pSrcA, - float32_t * pSrcB, - float32_t * pDst, - uint32_t blockSize) + const float32_t * pSrcA, + const float32_t * pSrcB, + float32_t * pDst, + uint32_t blockSize) { - uint32_t blkCnt; /* loop counter */ - -#if defined (ARM_MATH_DSP) + uint32_t blkCnt; /* Loop counter */ + +#if defined(ARM_MATH_NEON) + float32x4_t vec1; + float32x4_t vec2; + float32x4_t res; + + /* Compute 4 outputs at a time */ + blkCnt = blockSize >> 2U; + + while (blkCnt > 0U) + { + /* C = A - B */ + + /* Subtract and then store the results in the destination buffer. */ + vec1 = vld1q_f32(pSrcA); + vec2 = vld1q_f32(pSrcB); + res = vsubq_f32(vec1, vec2); + vst1q_f32(pDst, res); + + /* Increment pointers */ + pSrcA += 4; + pSrcB += 4; + pDst += 4; + + /* Decrement the loop counter */ + blkCnt--; + } + + /* Tail */ + blkCnt = blockSize & 0x3; -/* Run the below code for Cortex-M4 and Cortex-M3 */ - float32_t inA1, inA2, inA3, inA4; /* temporary variables */ - float32_t inB1, inB2, inB3, inB4; /* temporary variables */ +#else +#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 - B */ - /* Subtract and then store the results in the destination buffer. */ - /* Read 4 input samples from sourceA and sourceB */ - inA1 = *pSrcA; - inB1 = *pSrcB; - inA2 = *(pSrcA + 1); - inB2 = *(pSrcB + 1); - inA3 = *(pSrcA + 2); - inB3 = *(pSrcB + 2); - inA4 = *(pSrcA + 3); - inB4 = *(pSrcB + 3); - - /* dst = srcA - srcB */ - /* subtract and store the result */ - *pDst = inA1 - inB1; - *(pDst + 1) = inA2 - inB2; - *(pDst + 2) = inA3 - inB3; - *(pDst + 3) = inA4 - inB4; - - - /* Update pointers to process next sampels */ - pSrcA += 4U; - pSrcB += 4U; - pDst += 4U; - - /* Decrement the loop counter */ + + /* Subtract and store result in destination buffer. */ + *pDst++ = (*pSrcA++) - (*pSrcB++); + + *pDst++ = (*pSrcA++) - (*pSrcB++); + + *pDst++ = (*pSrcA++) - (*pSrcB++); + + *pDst++ = (*pSrcA++) - (*pSrcB++); + + /* 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) */ +#endif /* #if defined(ARM_MATH_NEON) */ while (blkCnt > 0U) { /* C = A - B */ - /* Subtract and then store the results in the destination buffer. */ + + /* Subtract and store result in destination buffer. */ *pDst++ = (*pSrcA++) - (*pSrcB++); - /* Decrement the loop counter */ + /* Decrement loop counter */ blkCnt--; } + } /** - * @} end of BasicSub group + @} end of BasicSub group */ -- cgit