| /* ---------------------------------------------------------------------- |
| * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
| * |
| * $Date: 19. March 2015 |
| * $Revision: V.1.4.5 |
| * |
| * Project: CMSIS DSP Library |
| * Title: arm_cmplx_mult_cmplx_q15.c |
| * |
| * Description: Q15 complex-by-complex 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 groupCmplxMath |
| */ |
| |
| /** |
| * @addtogroup CmplxByCmplxMult |
| * @{ |
| */ |
| |
| /** |
| * @brief Q15 complex-by-complex 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] numSamples number of complex samples in each vector |
| * @return none. |
| * |
| * <b>Scaling and Overflow Behavior:</b> |
| * \par |
| * The function implements 1.15 by 1.15 multiplications and finally output is converted into 3.13 format. |
| */ |
| |
| void arm_cmplx_mult_cmplx_q15( |
| q15_t * pSrcA, |
| q15_t * pSrcB, |
| q15_t * pDst, |
| uint32_t numSamples) |
| { |
| q15_t a, b, c, d; /* Temporary variables to store real and imaginary values */ |
| |
| #ifndef ARM_MATH_CM0_FAMILY |
| |
| /* Run the below code for Cortex-M4 and Cortex-M3 */ |
| uint32_t blkCnt; /* loop counters */ |
| |
| /* loop Unrolling */ |
| blkCnt = numSamples >> 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[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */ |
| /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */ |
| a = *pSrcA++; |
| b = *pSrcA++; |
| c = *pSrcB++; |
| d = *pSrcB++; |
| |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); |
| |
| a = *pSrcA++; |
| b = *pSrcA++; |
| c = *pSrcB++; |
| d = *pSrcB++; |
| |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); |
| |
| a = *pSrcA++; |
| b = *pSrcA++; |
| c = *pSrcB++; |
| d = *pSrcB++; |
| |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); |
| |
| a = *pSrcA++; |
| b = *pSrcA++; |
| c = *pSrcB++; |
| d = *pSrcB++; |
| |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); |
| |
| /* 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 = numSamples % 0x4u; |
| |
| while(blkCnt > 0u) |
| { |
| /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */ |
| /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */ |
| a = *pSrcA++; |
| b = *pSrcA++; |
| c = *pSrcB++; |
| d = *pSrcB++; |
| |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); |
| |
| /* Decrement the blockSize loop counter */ |
| blkCnt--; |
| } |
| |
| #else |
| |
| /* Run the below code for Cortex-M0 */ |
| |
| while(numSamples > 0u) |
| { |
| /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1]. */ |
| /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i]. */ |
| a = *pSrcA++; |
| b = *pSrcA++; |
| c = *pSrcB++; |
| d = *pSrcB++; |
| |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * c) >> 17) - (((q31_t) b * d) >> 17); |
| /* store the result in 3.13 format in the destination buffer. */ |
| *pDst++ = |
| (q15_t) (q31_t) (((q31_t) a * d) >> 17) + (((q31_t) b * c) >> 17); |
| |
| /* Decrement the blockSize loop counter */ |
| numSamples--; |
| } |
| |
| #endif /* #ifndef ARM_MATH_CM0_FAMILY */ |
| |
| } |
| |
| /** |
| * @} end of CmplxByCmplxMult group |
| */ |