CMSIS DSP Software Library: arm_cmplx_mult_cmplx_f32.c Source File

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# arm_cmplx_mult_cmplx_f32.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_f32.c
    00009 *
    00010 * Description:  Floating-point 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
    00073 void arm_cmplx_mult_cmplx_f32(
    00074   float32_t * pSrcA,
    00075   float32_t * pSrcB,
    00076   float32_t * pDst,
    00077   uint32_t numSamples)
    00078 {
    00079   float32_t a, b, c, d;                          /* Temporary variables to store real and imaginary values */
    00080
    00081 #ifndef ARM_MATH_CM0
    00082
    00083   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00084   uint32_t blkCnt;                               /* loop counters */
    00085
    00086   /* loop Unrolling */
    00087   blkCnt = numSamples >> 2u;
    00088
    00089   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00090    ** a second loop below computes the remaining 1 to 3 samples. */
    00091   while(blkCnt > 0u)
    00092   {
    00093     /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
    00094     /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
    00095     a = *pSrcA++;
    00096     b = *pSrcA++;
    00097     c = *pSrcB++;
    00098     d = *pSrcB++;
    00099
    00100     /* store the result in the destination buffer. */
    00101     *pDst++ = (a * c) - (b * d);
    00102     *pDst++ = (a * d) + (b * c);
    00103
    00104     a = *pSrcA++;
    00105     b = *pSrcA++;
    00106     c = *pSrcB++;
    00107     d = *pSrcB++;
    00108
    00109     *pDst++ = (a * c) - (b * d);
    00110     *pDst++ = (a * d) + (b * c);
    00111
    00112     a = *pSrcA++;
    00113     b = *pSrcA++;
    00114     c = *pSrcB++;
    00115     d = *pSrcB++;
    00116
    00117     *pDst++ = (a * c) - (b * d);
    00118     *pDst++ = (a * d) + (b * c);
    00119
    00120     a = *pSrcA++;
    00121     b = *pSrcA++;
    00122     c = *pSrcB++;
    00123     d = *pSrcB++;
    00124
    00125     *pDst++ = (a * c) - (b * d);
    00126     *pDst++ = (a * d) + (b * c);
    00127
    00128     /* Decrement the numSamples loop counter */
    00129     blkCnt--;
    00130   }
    00131
    00132   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00133    ** No loop unrolling is used. */
    00134   blkCnt = numSamples % 0x4u;
    00135
    00136   while(blkCnt > 0u)
    00137   {
    00138     /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
    00139     /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
    00140     a = *pSrcA++;
    00141     b = *pSrcA++;
    00142     c = *pSrcB++;
    00143     d = *pSrcB++;
    00144
    00145     /* store the result in the destination buffer. */
    00146     *pDst++ = (a * c) - (b * d);
    00147     *pDst++ = (a * d) + (b * c);
    00148
    00149     /* Decrement the numSamples loop counter */
    00150     blkCnt--;
    00151   }
    00152
    00153 #else
    00154
    00155   /* Run the below code for Cortex-M0 */
    00156
    00157   while(numSamples > 0u)
    00158   {
    00159     /* C[2 * i] = A[2 * i] * B[2 * i] - A[2 * i + 1] * B[2 * i + 1].  */
    00160     /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i].  */
    00161     a = *pSrcA++;
    00162     b = *pSrcA++;
    00163     c = *pSrcB++;
    00164     d = *pSrcB++;
    00165
    00166     /* store the result in the destination buffer. */
    00167     *pDst++ = (a * c) - (b * d);
    00168     *pDst++ = (a * d) + (b * c);
    00169
    00170     /* Decrement the numSamples loop counter */
    00171     numSamples--;
    00172   }
    00173
    00174 #endif /* #ifndef ARM_MATH_CM0 */
    00175
    00176 }
    00177

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