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Diffstat (limited to 'platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c')
| -rw-r--r-- | platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c new file mode 100644 index 0000000..d2cc66a --- /dev/null +++ b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_mult_real_q15.c @@ -0,0 +1,203 @@ +/* ---------------------------------------------------------------------- +* 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_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 + */ |