CMSIS DSP Software Library: arm_cmplx_mult_cmplx_q31.c Source File

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# arm_cmplx_mult_cmplx_q31.c

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    00001 /* ----------------------------------------------------------------------
    00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
    00003 *
    00004 * $Date:        15. July 2011
    00005 * $Revision:    V1.0.10
    00006 *
    00007 * Project:      CMSIS DSP Library
    00008 * Title:        arm_cmplx_mult_cmplx_q31.c
    00009 *
    00010 * Description:  Q31 complex-by-complex multiplication
    00011 *
    00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
    00013 *
    00014 * Version 1.0.10 2011/7/15
    00015 *    Big Endian support added and Merged M0 and M3/M4 Source code.
    00016 *
    00017 * Version 1.0.3 2010/11/29
    00018 *    Re-organized the CMSIS folders and updated documentation.
    00019 *
    00020 * Version 1.0.2 2010/11/11
    00021 *    Documentation updated.
    00022 *
    00023 * Version 1.0.1 2010/10/05
    00024 *    Production release and review comments incorporated.
    00025 *
    00026 * Version 1.0.0 2010/09/20
    00027 *    Production release and review comments incorporated.
    00028 * -------------------------------------------------------------------- */
    00029
    00030 #include "arm_math.h"
    00031
    00056 void arm_cmplx_mult_cmplx_q31(
    00057   q31_t * pSrcA,
    00058   q31_t * pSrcB,
    00059   q31_t * pDst,
    00060   uint32_t numSamples)
    00061 {
    00062   q31_t a, b, c, d;                              /* Temporary variables to store real and imaginary values */
    00063   uint32_t blkCnt;                               /* loop counters */
    00064
    00065 #ifndef ARM_MATH_CM0
    00066
    00067   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00068
    00069   /* loop Unrolling */
    00070   blkCnt = numSamples >> 2u;
    00071
    00072   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00073    ** a second loop below computes the remaining 1 to 3 samples. */
    00074   while(blkCnt > 0u)
    00075   {
    00076     /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
    00077     /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
    00078     a = *pSrcA++;
    00079     b = *pSrcA++;
    00080     c = *pSrcB++;
    00081     d = *pSrcB++;
    00082
    00083     /* store the real result in 3.29 format in the destination buffer. */
    00084     *pDst++ = (q31_t) ((((q63_t) a * c) >> 33) - (((q63_t) b * d) >> 33));
    00085     /* store the imag result in 3.29 format in the destination buffer. */
    00086     *pDst++ = (q31_t) ((((q63_t) a * d) >> 33) + (((q63_t) b * c) >> 33));
    00087
    00088     a = *pSrcA++;
    00089     b = *pSrcA++;
    00090     c = *pSrcB++;
    00091     d = *pSrcB++;
    00092
    00093     /* store the result in 3.29 format in the destination buffer. */
    00094     *pDst++ = (q31_t) ((((q63_t) a * c) >> 33) - (((q63_t) b * d) >> 33));
    00095     /* store the result in 3.29 format in the destination buffer. */
    00096     *pDst++ = (q31_t) ((((q63_t) a * d) >> 33) + (((q63_t) b * c) >> 33));
    00097
    00098     a = *pSrcA++;
    00099     b = *pSrcA++;
    00100     c = *pSrcB++;
    00101     d = *pSrcB++;
    00102
    00103     /* store the result in 3.29 format in the destination buffer. */
    00104     *pDst++ = (q31_t) ((((q63_t) a * c) >> 33) - (((q63_t) b * d) >> 33));
    00105     /* store the result in 3.29 format in the destination buffer. */
    00106     *pDst++ = (q31_t) ((((q63_t) a * d) >> 33) + (((q63_t) b * c) >> 33));
    00107
    00108     a = *pSrcA++;
    00109     b = *pSrcA++;
    00110     c = *pSrcB++;
    00111     d = *pSrcB++;
    00112
    00113     /* store the result in 3.29 format in the destination buffer. */
    00114     *pDst++ = (q31_t) ((((q63_t) a * c) >> 33) - (((q63_t) b * d) >> 33));
    00115     /* store the result in 3.29 format in the destination buffer. */
    00116     *pDst++ = (q31_t) ((((q63_t) a * d) >> 33) + (((q63_t) b * c) >> 33));
    00117
    00118     /* Decrement the blockSize loop counter */
    00119     blkCnt--;
    00120   }
    00121
    00122   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00123    ** No loop unrolling is used. */
    00124   blkCnt = numSamples % 0x4u;
    00125
    00126   while(blkCnt > 0u)
    00127   {
    00128     /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
    00129     /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
    00130     a = *pSrcA++;
    00131     b = *pSrcA++;
    00132     c = *pSrcB++;
    00133     d = *pSrcB++;
    00134
    00135     /* store the result in 3.29 format in the destination buffer. */
    00136     *pDst++ = (q31_t) ((((q63_t) a * c) >> 33) - (((q63_t) b * d) >> 33));
    00137     /* store the result in 3.29 format in the destination buffer. */
    00138     *pDst++ = (q31_t) ((((q63_t) a * d) >> 33) + (((q63_t) b * c) >> 33));
    00139
    00140     /* Decrement the blockSize loop counter */
    00141     blkCnt--;
    00142   }
    00143
    00144 #else
    00145
    00146   /* Run the below code for Cortex-M0 */
    00147
    00148   /* loop Unrolling */
    00149   blkCnt = numSamples >> 1u;
    00150
    00151   /* First part of the processing with loop unrolling.  Compute 2 outputs at a time.
    00152    ** a second loop below computes the remaining 1 sample. */
    00153   while(blkCnt > 0u)
    00154   {
    00155     /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
    00156     /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
    00157     a = *pSrcA++;
    00158     b = *pSrcA++;
    00159     c = *pSrcB++;
    00160     d = *pSrcB++;
    00161
    00162     /* store the real result in 3.29 format in the destination buffer. */
    00163     *pDst++ = (q31_t) ((((q63_t) a * c) >> 33) - (((q63_t) b * d) >> 33));
    00164     /* store the imag result in 3.29 format in the destination buffer. */
    00165     *pDst++ = (q31_t) ((((q63_t) a * d) >> 33) + (((q63_t) b * c) >> 33));
    00166
    00167     a = *pSrcA++;
    00168     b = *pSrcA++;
    00169     c = *pSrcB++;
    00170     d = *pSrcB++;
    00171
    00172     /* store the result in 3.29 format in the destination buffer. */
    00173     *pDst++ = (q31_t) ((((q63_t) a * c) >> 33) - (((q63_t) b * d) >> 33));
    00174     /* store the result in 3.29 format in the destination buffer. */
    00175     *pDst++ = (q31_t) ((((q63_t) a * d) >> 33) + (((q63_t) b * c) >> 33));
    00176
    00177     /* Decrement the blockSize loop counter */
    00178     blkCnt--;
    00179   }
    00180
    00181   /* If the blockSize is not a multiple of 2, compute any remaining output samples here.
    00182    ** No loop unrolling is used. */
    00183   blkCnt = numSamples % 0x2u;
    00184
    00185   while(blkCnt > 0u)
    00186   {
    00187     /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
    00188     /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
    00189     a = *pSrcA++;
    00190     b = *pSrcA++;
    00191     c = *pSrcB++;
    00192     d = *pSrcB++;
    00193
    00194     /* store the result in 3.29 format in the destination buffer. */
    00195     *pDst++ = (q31_t) ((((q63_t) a * c) >> 33) - (((q63_t) b * d) >> 33));
    00196     /* store the result in 3.29 format in the destination buffer. */
    00197     *pDst++ = (q31_t) ((((q63_t) a * d) >> 33) + (((q63_t) b * c) >> 33));
    00198
    00199     /* Decrement the blockSize loop counter */
    00200     blkCnt--;
    00201   }
    00202
    00203 #endif /* #ifndef ARM_MATH_CM0 */
    00204
    00205 }
    00206

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