/* ---------------------------------------------------------------------- * Copyright (C) 2010 ARM Limited. All rights reserved. * * $Date: 15. February 2012 * $Revision: V1.1.0 * * Project: CMSIS DSP Library * Title: arm_mult_f32.c * * Description: Floating-point vector multiplication. * * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 * * Version 1.1.0 2012/02/15 * Updated with more optimizations, bug fixes and minor API changes. * * Version 1.0.10 2011/7/15 * Big Endian support added and Merged M0 and M3/M4 Source code. * * Version 1.0.3 2010/11/29 * Re-organized the CMSIS folders and updated documentation. * * Version 1.0.2 2010/11/11 * Documentation updated. * * Version 1.0.1 2010/10/05 * Production release and review comments incorporated. * * Version 1.0.0 2010/09/20 * Production release and review comments incorporated. * * Version 0.0.5 2010/04/26 * incorporated review comments and updated with latest CMSIS layer * * Version 0.0.3 2010/03/10 * Initial version * -------------------------------------------------------------------- */ #include "arm_math.h" /** * @ingroup groupMath */ /** * @defgroup BasicMult Vector Multiplication * * Element-by-element multiplication 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 BasicMult * @{ */ /** * @brief Floating-point vector multiplication. * @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_mult_f32( float32_t * pSrcA, float32_t * pSrcB, float32_t * pDst, uint32_t blockSize) { uint32_t blkCnt; /* loop counters */ #ifndef ARM_MATH_CM0 /* Run the below code for Cortex-M4 and Cortex-M3 */ float32_t inA1, inA2, inA3, inA4; /* temporary input variables */ float32_t inB1, inB2, inB3, inB4; /* temporary input variables */ float32_t out1, out2, out3, out4; /* temporary output variables */ /* loop Unrolling */ 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 */ /* Multiply the inputs and store the results in output buffer */ /* read sample from sourceA */ inA1 = *pSrcA; /* read sample from sourceB */ inB1 = *pSrcB; /* read sample from sourceA */ inA2 = *(pSrcA + 1); /* read sample from sourceB */ inB2 = *(pSrcB + 1); /* out = sourceA * sourceB */ out1 = inA1 * inB1; /* read sample from sourceA */ inA3 = *(pSrcA + 2); /* read sample from sourceB */ inB3 = *(pSrcB + 2); /* out = sourceA * sourceB */ out2 = inA2 * inB2; /* read sample from sourceA */ inA4 = *(pSrcA + 3); /* store result to destination buffer */ *pDst = out1; /* read sample from sourceB */ inB4 = *(pSrcB + 3); /* out = sourceA * sourceB */ out3 = inA3 * inB3; /* store result to destination buffer */ *(pDst + 1) = out2; /* out = sourceA * sourceB */ out4 = inA4 * inB4; /* store result to destination buffer */ *(pDst + 2) = out3; /* store result to destination buffer */ *(pDst + 3) = out4; /* update pointers to process next samples */ pSrcA += 4u; pSrcB += 4u; pDst += 4u; /* Decrement the blockSize loop counter */ blkCnt--; } /* If the blockSize is not a multiple of 4, compute any remaining output samples here. ** No loop unrolling is used. */ blkCnt = blockSize % 0x4u; #else /* Run the below code for Cortex-M0 */ /* Initialize blkCnt with number of samples */ blkCnt = blockSize; #endif /* #ifndef ARM_MATH_CM0 */ while(blkCnt > 0u) { /* C = A * B */ /* Multiply the inputs and store the results in output buffer */ *pDst++ = (*pSrcA++) * (*pSrcB++); /* Decrement the blockSize loop counter */ blkCnt--; } } /** * @} end of BasicMult group */