diff options
Diffstat (limited to 'platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c')
| -rw-r--r-- | platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c new file mode 100644 index 0000000..539ee76 --- /dev/null +++ b/platform/CMSIS/DSP_Lib/Source/ComplexMathFunctions/arm_cmplx_conj_q31.c @@ -0,0 +1,180 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2014 ARM Limited. All rights reserved. +* +* $Date: 12. March 2014 +* $Revision: V1.4.4 +* +* Project: CMSIS DSP Library +* Title: arm_cmplx_conj_q31.c +* +* Description: Q31 complex conjugate. +* +* 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_conj + * @{ + */ + +/** + * @brief Q31 complex conjugate. + * @param *pSrc points to the input vector + * @param *pDst points to the output vector + * @param numSamples number of complex samples in each vector + * @return none. + * + * <b>Scaling and Overflow Behavior:</b> + * \par + * The function uses saturating arithmetic. + * The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF. + */ + +void arm_cmplx_conj_q31( + q31_t * pSrc, + q31_t * pDst, + uint32_t numSamples) +{ + uint32_t blkCnt; /* loop counter */ + q31_t in; /* Input value */ + +#ifndef ARM_MATH_CM0_FAMILY + + /* Run the below code for Cortex-M4 and Cortex-M3 */ + q31_t inR1, inR2, inR3, inR4; /* Temporary real variables */ + q31_t inI1, inI2, inI3, inI4; /* Temporary imaginary variables */ + + /*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[0]+jC[1] = A[0]+ j (-1) A[1] */ + /* Calculate Complex Conjugate and then store the results in the destination buffer. */ + /* Saturated to 0x7fffffff if the input is -1(0x80000000) */ + /* read real input sample */ + inR1 = pSrc[0]; + /* store real input sample */ + pDst[0] = inR1; + + /* read imaginary input sample */ + inI1 = pSrc[1]; + + /* read real input sample */ + inR2 = pSrc[2]; + /* store real input sample */ + pDst[2] = inR2; + + /* read imaginary input sample */ + inI2 = pSrc[3]; + + /* negate imaginary input sample */ + inI1 = __QSUB(0, inI1); + + /* read real input sample */ + inR3 = pSrc[4]; + /* store real input sample */ + pDst[4] = inR3; + + /* read imaginary input sample */ + inI3 = pSrc[5]; + + /* negate imaginary input sample */ + inI2 = __QSUB(0, inI2); + + /* read real input sample */ + inR4 = pSrc[6]; + /* store real input sample */ + pDst[6] = inR4; + + /* negate imaginary input sample */ + inI3 = __QSUB(0, inI3); + + /* store imaginary input sample */ + inI4 = pSrc[7]; + + /* store imaginary input samples */ + pDst[1] = inI1; + + /* negate imaginary input sample */ + inI4 = __QSUB(0, inI4); + + /* store imaginary input samples */ + pDst[3] = inI2; + + /* increment source pointer by 8 to proecess next samples */ + pSrc += 8u; + + /* store imaginary input samples */ + pDst[5] = inI3; + pDst[7] = inI4; + + /* increment destination pointer by 8 to process next samples */ + pDst += 8u; + + /* 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; + +#else + + /* Run the below code for Cortex-M0 */ + blkCnt = numSamples; + + +#endif /* #ifndef ARM_MATH_CM0_FAMILY */ + + while(blkCnt > 0u) + { + /* C[0]+jC[1] = A[0]+ j (-1) A[1] */ + /* Calculate Complex Conjugate and then store the results in the destination buffer. */ + /* Saturated to 0x7fffffff if the input is -1(0x80000000) */ + *pDst++ = *pSrc++; + in = *pSrc++; + *pDst++ = (in == INT32_MIN) ? INT32_MAX : -in; + + /* Decrement the loop counter */ + blkCnt--; + } +} + +/** + * @} end of cmplx_conj group + */ |