| /* ---------------------------------------------------------------------- |
| * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
| * |
| * $Date: 19. March 2015 |
| * $Revision: V.1.4.5 |
| * |
| * Project: CMSIS DSP Library |
| * Title: arm_mult_f32.c |
| * |
| * Description: Floating-point vector multiplication. |
| * |
| * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * - Neither the name of ARM LIMITED nor the names of its contributors |
| * may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| * -------------------------------------------------------------------- */ |
| |
| #include "arm_math.h" |
| |
| /** |
| * @ingroup groupMath |
| */ |
| |
| /** |
| * @defgroup BasicMult Vector Multiplication |
| * |
| * Element-by-element multiplication of two vectors. |
| * |
| * <pre> |
| * pDst[n] = pSrcA[n] * pSrcB[n], 0 <= n < blockSize. |
| * </pre> |
| * |
| * 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_FAMILY |
| |
| /* 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_FAMILY */ |
| |
| 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 |
| */ |