CMSIS DSP Software Library: arm_cmplx_mult_real_f32.c Source File

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# arm_cmplx_mult_real_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_real_f32.c
    00009 *
    00010 * Description:  Floating-point complex by real 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
    00074 void arm_cmplx_mult_real_f32(
    00075   float32_t * pSrcCmplx,
    00076   float32_t * pSrcReal,
    00077   float32_t * pCmplxDst,
    00078   uint32_t numSamples)
    00079 {
    00080   float32_t in;                                  /* Temporary variable to store input value */
    00081
    00082 #ifndef ARM_MATH_CM0
    00083
    00084   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00085   uint32_t blkCnt;                               /* loop counters */
    00086
    00087   /* loop Unrolling */
    00088   blkCnt = numSamples >> 2u;
    00089
    00090   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00091    ** a second loop below computes the remaining 1 to 3 samples. */
    00092   while(blkCnt > 0u)
    00093   {
    00094     /* C[2 * i] = A[2 * i] * B[i].            */
    00095     /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */
    00096     in = *pSrcReal++;
    00097     /* store the result in the destination buffer. */
    00098     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00099     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00100
    00101     in = *pSrcReal++;
    00102     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00103     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00104
    00105     in = *pSrcReal++;
    00106     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00107     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00108
    00109     in = *pSrcReal++;
    00110     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00111     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00112
    00113     /* Decrement the numSamples loop counter */
    00114     blkCnt--;
    00115   }
    00116
    00117   /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
    00118    ** No loop unrolling is used. */
    00119   blkCnt = numSamples % 0x4u;
    00120
    00121   while(blkCnt > 0u)
    00122   {
    00123     /* C[2 * i] = A[2 * i] * B[i].            */
    00124     /* C[2 * i + 1] = A[2 * i + 1] * B[i].        */
    00125     in = *pSrcReal++;
    00126     /* store the result in the destination buffer. */
    00127     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00128     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00129
    00130     /* Decrement the numSamples loop counter */
    00131     blkCnt--;
    00132   }
    00133
    00134 #else
    00135
    00136   /* Run the below code for Cortex-M0 */
    00137
    00138   while(numSamples > 0u)
    00139   {
    00140     /* realOut = realA * realB.            */
    00141     /* imagOut = imagA * realB.                */
    00142     in = *pSrcReal++;
    00143     /* store the result in the destination buffer. */
    00144     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00145     *pCmplxDst++ = (*pSrcCmplx++) * (in);
    00146
    00147     /* Decrement the numSamples loop counter */
    00148     numSamples--;
    00149   }
    00150
    00151 #endif /* #ifndef ARM_MATH_CM0 */
    00152
    00153 }
    00154

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