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-/* ----------------------------------------------------------------------
-* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
-*
-* $Date: 19. October 2015
-* $Revision: V.1.4.5 a
-*
-* Project: CMSIS DSP Library
-* Title: arm_cmplx_mult_real_q15.c
-*
-* Description: Q15 complex by real 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 CmplxByRealMult
- * @{
- */
-
-
-/**
- * @brief Q15 complex-by-real multiplication
- * @param[in] *pSrcCmplx points to the complex input vector
- * @param[in] *pSrcReal points to the real input vector
- * @param[out] *pCmplxDst points to the complex output vector
- * @param[in] numSamples number of samples in each vector
- * @return none.
- *
- * <b>Scaling and Overflow Behavior:</b>
- * \par
- * The function uses saturating arithmetic.
- * Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated.
- */
-
-void arm_cmplx_mult_real_q15(
- q15_t * pSrcCmplx,
- q15_t * pSrcReal,
- q15_t * pCmplxDst,
- uint32_t numSamples)
-{
- q15_t in; /* Temporary variable to store input value */
-
-#ifndef ARM_MATH_CM0_FAMILY
-
- /* Run the below code for Cortex-M4 and Cortex-M3 */
- uint32_t blkCnt; /* loop counters */
- q31_t inA1, inA2; /* Temporary variables to hold input data */
- q31_t inB1; /* Temporary variables to hold input data */
- q15_t out1, out2, out3, out4; /* Temporary variables to hold output data */
- q31_t mul1, mul2, mul3, mul4; /* Temporary variables to hold intermediate data */
-
- /* 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[i]. */
- /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
- /* read complex number both real and imaginary from complex input buffer */
- inA1 = *__SIMD32(pSrcCmplx)++;
- /* read two real values at a time from real input buffer */
- inB1 = *__SIMD32(pSrcReal)++;
- /* read complex number both real and imaginary from complex input buffer */
- inA2 = *__SIMD32(pSrcCmplx)++;
-
- /* multiply complex number with real numbers */
-#ifndef ARM_MATH_BIG_ENDIAN
-
- mul1 = (q31_t) ((q15_t) (inA1) * (q15_t) (inB1));
- mul2 = (q31_t) ((q15_t) (inA1 >> 16) * (q15_t) (inB1));
- mul3 = (q31_t) ((q15_t) (inA2) * (q15_t) (inB1 >> 16));
- mul4 = (q31_t) ((q15_t) (inA2 >> 16) * (q15_t) (inB1 >> 16));
-
-#else
-
- mul2 = (q31_t) ((q15_t) (inA1 >> 16) * (q15_t) (inB1 >> 16));
- mul1 = (q31_t) ((q15_t) inA1 * (q15_t) (inB1 >> 16));
- mul4 = (q31_t) ((q15_t) (inA2 >> 16) * (q15_t) inB1);
- mul3 = (q31_t) ((q15_t) inA2 * (q15_t) inB1);
-
-#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
-
- /* saturate the result */
- out1 = (q15_t) __SSAT(mul1 >> 15u, 16);
- out2 = (q15_t) __SSAT(mul2 >> 15u, 16);
- out3 = (q15_t) __SSAT(mul3 >> 15u, 16);
- out4 = (q15_t) __SSAT(mul4 >> 15u, 16);
-
- /* pack real and imaginary outputs and store them to destination */
- *__SIMD32(pCmplxDst)++ = __PKHBT(out1, out2, 16);
- *__SIMD32(pCmplxDst)++ = __PKHBT(out3, out4, 16);
-
- inA1 = *__SIMD32(pSrcCmplx)++;
- inB1 = *__SIMD32(pSrcReal)++;
- inA2 = *__SIMD32(pSrcCmplx)++;
-
-#ifndef ARM_MATH_BIG_ENDIAN
-
- mul1 = (q31_t) ((q15_t) (inA1) * (q15_t) (inB1));
- mul2 = (q31_t) ((q15_t) (inA1 >> 16) * (q15_t) (inB1));
- mul3 = (q31_t) ((q15_t) (inA2) * (q15_t) (inB1 >> 16));
- mul4 = (q31_t) ((q15_t) (inA2 >> 16) * (q15_t) (inB1 >> 16));
-
-#else
-
- mul2 = (q31_t) ((q15_t) (inA1 >> 16) * (q15_t) (inB1 >> 16));
- mul1 = (q31_t) ((q15_t) inA1 * (q15_t) (inB1 >> 16));
- mul4 = (q31_t) ((q15_t) (inA2 >> 16) * (q15_t) inB1);
- mul3 = (q31_t) ((q15_t) inA2 * (q15_t) inB1);
-
-#endif /* #ifndef ARM_MATH_BIG_ENDIAN */
-
- out1 = (q15_t) __SSAT(mul1 >> 15u, 16);
- out2 = (q15_t) __SSAT(mul2 >> 15u, 16);
- out3 = (q15_t) __SSAT(mul3 >> 15u, 16);
- out4 = (q15_t) __SSAT(mul4 >> 15u, 16);
-
- *__SIMD32(pCmplxDst)++ = __PKHBT(out1, out2, 16);
- *__SIMD32(pCmplxDst)++ = __PKHBT(out3, out4, 16);
-
- /* Decrement the numSamples loop counter */
- blkCnt--;
- }
-
- /* If the numSamples 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[i]. */
- /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */
- in = *pSrcReal++;
- /* store the result in the destination buffer. */
- *pCmplxDst++ =
- (q15_t) __SSAT((((q31_t) (*pSrcCmplx++) * (in)) >> 15), 16);
- *pCmplxDst++ =
- (q15_t) __SSAT((((q31_t) (*pSrcCmplx++) * (in)) >> 15), 16);
-
- /* Decrement the numSamples loop counter */
- blkCnt--;
- }
-
-#else
-
- /* Run the below code for Cortex-M0 */
-
- while(numSamples > 0u)
- {
- /* realOut = realA * realB. */
- /* imagOut = imagA * realB. */
- in = *pSrcReal++;
- /* store the result in the destination buffer. */
- *pCmplxDst++ =
- (q15_t) __SSAT((((q31_t) (*pSrcCmplx++) * (in)) >> 15), 16);
- *pCmplxDst++ =
- (q15_t) __SSAT((((q31_t) (*pSrcCmplx++) * (in)) >> 15), 16);
-
- /* Decrement the numSamples loop counter */
- numSamples--;
- }
-
-#endif /* #ifndef ARM_MATH_CM0_FAMILY */
-
-}
-
-/**
- * @} end of CmplxByRealMult group
- */
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