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Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_dot_prod_q31.c')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_dot_prod_q31.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_dot_prod_q31.c b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_dot_prod_q31.c new file mode 100644 index 0000000000..f7e2363bcc --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ComplexMathFunctions/arm_cmplx_dot_prod_q31.c @@ -0,0 +1,153 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2013 ARM Limited. All rights reserved. +* +* $Date: 17. January 2013 +* $Revision: V1.4.1 +* +* Project: CMSIS DSP Library +* Title: arm_cmplx_dot_prod_q31.c +* +* Description: Q31 complex dot product +* +* 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 cmplx_dot_prod + * @{ + */ + +/** + * @brief Q31 complex dot product + * @param *pSrcA points to the first input vector + * @param *pSrcB points to the second input vector + * @param numSamples number of complex samples in each vector + * @param *realResult real part of the result returned here + * @param *imagResult imaginary part of the result returned here + * @return none. + * + * <b>Scaling and Overflow Behavior:</b> + * \par + * The function is implemented using an internal 64-bit accumulator. + * The intermediate 1.31 by 1.31 multiplications are performed with 64-bit precision and then shifted to 16.48 format. + * The internal real and imaginary accumulators are in 16.48 format and provide 15 guard bits. + * Additions are nonsaturating and no overflow will occur as long as <code>numSamples</code> is less than 32768. + * The return results <code>realResult</code> and <code>imagResult</code> are in 16.48 format. + * Input down scaling is not required. + */ + +void arm_cmplx_dot_prod_q31( + q31_t * pSrcA, + q31_t * pSrcB, + uint32_t numSamples, + q63_t * realResult, + q63_t * imagResult) +{ + q63_t real_sum = 0, imag_sum = 0; /* Temporary result storage */ + +#ifndef ARM_MATH_CM0_FAMILY + + /* Run the below code for Cortex-M4 and Cortex-M3 */ + uint32_t blkCnt; /* loop counter */ + + + /*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) + { + /* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */ + /* Convert real data in 2.62 to 16.48 by 14 right shifts */ + real_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + /* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */ + /* Convert imag data in 2.62 to 16.48 by 14 right shifts */ + imag_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + + real_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + imag_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + + real_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + imag_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + + real_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + imag_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + + + /* Decrement the 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) + { + /* CReal = A[0]* B[0] + A[2]* B[2] + A[4]* B[4] + .....+ A[numSamples-2]* B[numSamples-2] */ + real_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + /* CImag = A[1]* B[1] + A[3]* B[3] + A[5]* B[5] + .....+ A[numSamples-1]* B[numSamples-1] */ + imag_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + + /* Decrement the loop counter */ + blkCnt--; + } + +#else + + /* Run the below code for Cortex-M0 */ + + while(numSamples > 0u) + { + /* outReal = realA[0]* realB[0] + realA[2]* realB[2] + realA[4]* realB[4] + .....+ realA[numSamples-2]* realB[numSamples-2] */ + real_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + /* outImag = imagA[1]* imagB[1] + imagA[3]* imagB[3] + imagA[5]* imagB[5] + .....+ imagA[numSamples-1]* imagB[numSamples-1] */ + imag_sum += (q63_t) * pSrcA++ * (*pSrcB++) >> 14; + + /* Decrement the loop counter */ + numSamples--; + } + +#endif /* #ifndef ARM_MATH_CM0_FAMILY */ + + /* Store the real and imaginary results in 16.48 format */ + *realResult = real_sum; + *imagResult = imag_sum; +} + +/** + * @} end of cmplx_dot_prod group + */ |