diff options
Diffstat (limited to 'platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q31.c')
| -rw-r--r-- | platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q31.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q31.c b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q31.c new file mode 100644 index 0000000..2ac09f5 --- /dev/null +++ b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q31.c @@ -0,0 +1,223 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2014 ARM Limited. All rights reserved. +* +* $Date: 12. March 2014 +* $Revision: V1.4.4 +* +* Project: CMSIS DSP Library +* Title: arm_cmplx_mult_real_q31.c +* +* Description: Q31 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 Q31 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 Q31 range[0x80000000 0x7FFFFFFF] will be saturated. + */ + +void arm_cmplx_mult_real_q31( + q31_t * pSrcCmplx, + q31_t * pSrcReal, + q31_t * pCmplxDst, + uint32_t numSamples) +{ + q31_t inA1; /* 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 inA2, inA3, inA4; /* Temporary variables to hold input data */ + q31_t inB1, inB2; /* Temporary variabels to hold input data */ + q31_t out1, out2, out3, out4; /* Temporary variables to hold output 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 real input from complex input buffer */ + inA1 = *pSrcCmplx++; + inA2 = *pSrcCmplx++; + /* read input from real input bufer */ + inB1 = *pSrcReal++; + inB2 = *pSrcReal++; + /* read imaginary input from complex input buffer */ + inA3 = *pSrcCmplx++; + inA4 = *pSrcCmplx++; + + /* multiply complex input with real input */ + out1 = ((q63_t) inA1 * inB1) >> 32; + out2 = ((q63_t) inA2 * inB1) >> 32; + out3 = ((q63_t) inA3 * inB2) >> 32; + out4 = ((q63_t) inA4 * inB2) >> 32; + + /* sature the result */ + out1 = __SSAT(out1, 31); + out2 = __SSAT(out2, 31); + out3 = __SSAT(out3, 31); + out4 = __SSAT(out4, 31); + + /* get result in 1.31 format */ + out1 = out1 << 1; + out2 = out2 << 1; + out3 = out3 << 1; + out4 = out4 << 1; + + /* store the result to destination buffer */ + *pCmplxDst++ = out1; + *pCmplxDst++ = out2; + *pCmplxDst++ = out3; + *pCmplxDst++ = out4; + + /* read real input from complex input buffer */ + inA1 = *pSrcCmplx++; + inA2 = *pSrcCmplx++; + /* read input from real input bufer */ + inB1 = *pSrcReal++; + inB2 = *pSrcReal++; + /* read imaginary input from complex input buffer */ + inA3 = *pSrcCmplx++; + inA4 = *pSrcCmplx++; + + /* multiply complex input with real input */ + out1 = ((q63_t) inA1 * inB1) >> 32; + out2 = ((q63_t) inA2 * inB1) >> 32; + out3 = ((q63_t) inA3 * inB2) >> 32; + out4 = ((q63_t) inA4 * inB2) >> 32; + + /* sature the result */ + out1 = __SSAT(out1, 31); + out2 = __SSAT(out2, 31); + out3 = __SSAT(out3, 31); + out4 = __SSAT(out4, 31); + + /* get result in 1.31 format */ + out1 = out1 << 1; + out2 = out2 << 1; + out3 = out3 << 1; + out4 = out4 << 1; + + /* store the result to destination buffer */ + *pCmplxDst++ = out1; + *pCmplxDst++ = out2; + *pCmplxDst++ = out3; + *pCmplxDst++ = out4; + + /* 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]. */ + /* read real input from complex input buffer */ + inA1 = *pSrcCmplx++; + inA2 = *pSrcCmplx++; + /* read input from real input bufer */ + inB1 = *pSrcReal++; + + /* multiply complex input with real input */ + out1 = ((q63_t) inA1 * inB1) >> 32; + out2 = ((q63_t) inA2 * inB1) >> 32; + + /* sature the result */ + out1 = __SSAT(out1, 31); + out2 = __SSAT(out2, 31); + + /* get result in 1.31 format */ + out1 = out1 << 1; + out2 = out2 << 1; + + /* store the result to destination buffer */ + *pCmplxDst++ = out1; + *pCmplxDst++ = out2; + + /* Decrement the numSamples loop counter */ + blkCnt--; + } + +#else + + /* Run the below code for Cortex-M0 */ + + while(numSamples > 0u) + { + /* realOut = realA * realB. */ + /* imagReal = imagA * realB. */ + inA1 = *pSrcReal++; + /* store the result in the destination buffer. */ + *pCmplxDst++ = + (q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * inA1) >> 31); + *pCmplxDst++ = + (q31_t) clip_q63_to_q31(((q63_t) * pSrcCmplx++ * inA1) >> 31); + + /* Decrement the numSamples loop counter */ + numSamples--; + } + +#endif /* #ifndef ARM_MATH_CM0_FAMILY */ + +} + +/** + * @} end of CmplxByRealMult group + */ |