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# arm_correlate_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_correlate_f32.c
    00009 *
    00010 * Description:   Correlation of floating-point sequences.
    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 * Version 0.0.7  2010/06/10
    00030 *    Misra-C changes done
    00031 *
    00032 * -------------------------------------------------------------------------- */
    00033
    00034 #include "arm_math.h"
    00035
    00095 void arm_correlate_f32(
    00096   float32_t * pSrcA,
    00097   uint32_t srcALen,
    00098   float32_t * pSrcB,
    00099   uint32_t srcBLen,
    00100   float32_t * pDst)
    00101 {
    00102
    00103
    00104 #ifndef ARM_MATH_CM0
    00105
    00106   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00107
    00108   float32_t *pIn1;                               /* inputA pointer */
    00109   float32_t *pIn2;                               /* inputB pointer */
    00110   float32_t *pOut = pDst;                        /* output pointer */
    00111   float32_t *px;                                 /* Intermediate inputA pointer */
    00112   float32_t *py;                                 /* Intermediate inputB pointer */
    00113   float32_t *pSrc1;                              /* Intermediate pointers */
    00114   float32_t sum, acc0, acc1, acc2, acc3;         /* Accumulators */
    00115   float32_t x0, x1, x2, x3, c0;                  /* temporary variables for holding input and coefficient values */
    00116   uint32_t j, k = 0u, count, blkCnt, outBlockSize, blockSize1, blockSize2, blockSize3;  /* loop counters */
    00117   int32_t inc = 1;                               /* Destination address modifier */
    00118
    00119
    00120   /* The algorithm implementation is based on the lengths of the inputs. */
    00121   /* srcB is always made to slide across srcA. */
    00122   /* So srcBLen is always considered as shorter or equal to srcALen */
    00123   /* But CORR(x, y) is reverse of CORR(y, x) */
    00124   /* So, when srcBLen > srcALen, output pointer is made to point to the end of the output buffer */
    00125   /* and the destination pointer modifier, inc is set to -1 */
    00126   /* If srcALen > srcBLen, zero pad has to be done to srcB to make the two inputs of same length */
    00127   /* But to improve the performance,
    00128    * we include zeroes in the output instead of zero padding either of the the inputs*/
    00129   /* If srcALen > srcBLen,
    00130    * (srcALen - srcBLen) zeroes has to included in the starting of the output buffer */
    00131   /* If srcALen < srcBLen,
    00132    * (srcALen - srcBLen) zeroes has to included in the ending of the output buffer */
    00133   if(srcALen >= srcBLen)
    00134   {
    00135     /* Initialization of inputA pointer */
    00136     pIn1 = pSrcA;
    00137
    00138     /* Initialization of inputB pointer */
    00139     pIn2 = pSrcB;
    00140
    00141     /* Number of output samples is calculated */
    00142     outBlockSize = (2u * srcALen) - 1u;
    00143
    00144     /* When srcALen > srcBLen, zero padding has to be done to srcB
    00145      * to make their lengths equal.
    00146      * Instead, (outBlockSize - (srcALen + srcBLen - 1))
    00147      * number of output samples are made zero */
    00148     j = outBlockSize - (srcALen + (srcBLen - 1u));
    00149
    00150     /* Updating the pointer position to non zero value */
    00151     pOut += j;
    00152
    00153     //while(j > 0u)
    00154     //{
    00155     //  /* Zero is stored in the destination buffer */
    00156     //  *pOut++ = 0.0f;
    00157
    00158     //  /* Decrement the loop counter */
    00159     //  j--;
    00160     //}
    00161
    00162   }
    00163   else
    00164   {
    00165     /* Initialization of inputA pointer */
    00166     pIn1 = pSrcB;
    00167
    00168     /* Initialization of inputB pointer */
    00169     pIn2 = pSrcA;
    00170
    00171     /* srcBLen is always considered as shorter or equal to srcALen */
    00172     j = srcBLen;
    00173     srcBLen = srcALen;
    00174     srcALen = j;
    00175
    00176     /* CORR(x, y) = Reverse order(CORR(y, x)) */
    00177     /* Hence set the destination pointer to point to the last output sample */
    00178     pOut = pDst + ((srcALen + srcBLen) - 2u);
    00179
    00180     /* Destination address modifier is set to -1 */
    00181     inc = -1;
    00182
    00183   }
    00184
    00185   /* The function is internally
    00186    * divided into three parts according to the number of multiplications that has to be
    00187    * taken place between inputA samples and inputB samples. In the first part of the
    00188    * algorithm, the multiplications increase by one for every iteration.
    00189    * In the second part of the algorithm, srcBLen number of multiplications are done.
    00190    * In the third part of the algorithm, the multiplications decrease by one
    00191    * for every iteration.*/
    00192   /* The algorithm is implemented in three stages.
    00193    * The loop counters of each stage is initiated here. */
    00194   blockSize1 = srcBLen - 1u;
    00195   blockSize2 = srcALen - (srcBLen - 1u);
    00196   blockSize3 = blockSize1;
    00197
    00198   /* --------------------------
    00199    * Initializations of stage1
    00200    * -------------------------*/
    00201
    00202   /* sum = x[0] * y[srcBlen - 1]
    00203    * sum = x[0] * y[srcBlen-2] + x[1] * y[srcBlen - 1]
    00204    * ....
    00205    * sum = x[0] * y[0] + x[1] * y[1] +...+ x[srcBLen - 1] * y[srcBLen - 1]
    00206    */
    00207
    00208   /* In this stage the MAC operations are increased by 1 for every iteration.
    00209      The count variable holds the number of MAC operations performed */
    00210   count = 1u;
    00211
    00212   /* Working pointer of inputA */
    00213   px = pIn1;
    00214
    00215   /* Working pointer of inputB */
    00216   pSrc1 = pIn2 + (srcBLen - 1u);
    00217   py = pSrc1;
    00218
    00219   /* ------------------------
    00220    * Stage1 process
    00221    * ----------------------*/
    00222
    00223   /* The first stage starts here */
    00224   while(blockSize1 > 0u)
    00225   {
    00226     /* Accumulator is made zero for every iteration */
    00227     sum = 0.0f;
    00228
    00229     /* Apply loop unrolling and compute 4 MACs simultaneously. */
    00230     k = count >> 2u;
    00231
    00232     /* First part of the processing with loop unrolling.  Compute 4 MACs at a time.
    00233      ** a second loop below computes MACs for the remaining 1 to 3 samples. */
    00234     while(k > 0u)
    00235     {
    00236       /* x[0] * y[srcBLen - 4] */
    00237       sum += *px++ * *py++;
    00238       /* x[1] * y[srcBLen - 3] */
    00239       sum += *px++ * *py++;
    00240       /* x[2] * y[srcBLen - 2] */
    00241       sum += *px++ * *py++;
    00242       /* x[3] * y[srcBLen - 1] */
    00243       sum += *px++ * *py++;
    00244
    00245       /* Decrement the loop counter */
    00246       k--;
    00247     }
    00248
    00249     /* If the count is not a multiple of 4, compute any remaining MACs here.
    00250      ** No loop unrolling is used. */
    00251     k = count % 0x4u;
    00252
    00253     while(k > 0u)
    00254     {
    00255       /* Perform the multiply-accumulate */
    00256       /* x[0] * y[srcBLen - 1] */
    00257       sum += *px++ * *py++;
    00258
    00259       /* Decrement the loop counter */
    00260       k--;
    00261     }
    00262
    00263     /* Store the result in the accumulator in the destination buffer. */
    00264     *pOut = sum;
    00265     /* Destination pointer is updated according to the address modifier, inc */
    00266     pOut += inc;
    00267
    00268     /* Update the inputA and inputB pointers for next MAC calculation */
    00269     py = pSrc1 - count;
    00270     px = pIn1;
    00271
    00272     /* Increment the MAC count */
    00273     count++;
    00274
    00275     /* Decrement the loop counter */
    00276     blockSize1--;
    00277   }
    00278
    00279   /* --------------------------
    00280    * Initializations of stage2
    00281    * ------------------------*/
    00282
    00283   /* sum = x[0] * y[0] + x[1] * y[1] +...+ x[srcBLen-1] * y[srcBLen-1]
    00284    * sum = x[1] * y[0] + x[2] * y[1] +...+ x[srcBLen] * y[srcBLen-1]
    00285    * ....
    00286    * sum = x[srcALen-srcBLen-2] * y[0] + x[srcALen-srcBLen-1] * y[1] +...+ x[srcALen-1] * y[srcBLen-1]
    00287    */
    00288
    00289   /* Working pointer of inputA */
    00290   px = pIn1;
    00291
    00292   /* Working pointer of inputB */
    00293   py = pIn2;
    00294
    00295   /* count is index by which the pointer pIn1 to be incremented */
    00296   count = 1u;
    00297
    00298   /* -------------------
    00299    * Stage2 process
    00300    * ------------------*/
    00301
    00302   /* Stage2 depends on srcBLen as in this stage srcBLen number of MACS are performed.
    00303    * So, to loop unroll over blockSize2,
    00304    * srcBLen should be greater than or equal to 4, to loop unroll the srcBLen loop */
    00305   if(srcBLen >= 4u)
    00306   {
    00307     /* Loop unroll over blockSize2, by 4 */
    00308     blkCnt = blockSize2 >> 2u;
    00309
    00310     while(blkCnt > 0u)
    00311     {
    00312       /* Set all accumulators to zero */
    00313       acc0 = 0.0f;
    00314       acc1 = 0.0f;
    00315       acc2 = 0.0f;
    00316       acc3 = 0.0f;
    00317
    00318       /* read x[0], x[1], x[2] samples */
    00319       x0 = *(px++);
    00320       x1 = *(px++);
    00321       x2 = *(px++);
    00322
    00323       /* Apply loop unrolling and compute 4 MACs simultaneously. */
    00324       k = srcBLen >> 2u;
    00325
    00326       /* First part of the processing with loop unrolling.  Compute 4 MACs at a time.
    00327        ** a second loop below computes MACs for the remaining 1 to 3 samples. */
    00328       do
    00329       {
    00330         /* Read y[0] sample */
    00331         c0 = *(py++);
    00332
    00333         /* Read x[3] sample */
    00334         x3 = *(px++);
    00335
    00336         /* Perform the multiply-accumulate */
    00337         /* acc0 +=  x[0] * y[0] */
    00338         acc0 += x0 * c0;
    00339         /* acc1 +=  x[1] * y[0] */
    00340         acc1 += x1 * c0;
    00341         /* acc2 +=  x[2] * y[0] */
    00342         acc2 += x2 * c0;
    00343         /* acc3 +=  x[3] * y[0] */
    00344         acc3 += x3 * c0;
    00345
    00346         /* Read y[1] sample */
    00347         c0 = *(py++);
    00348
    00349         /* Read x[4] sample */
    00350         x0 = *(px++);
    00351
    00352         /* Perform the multiply-accumulate */
    00353         /* acc0 +=  x[1] * y[1] */
    00354         acc0 += x1 * c0;
    00355         /* acc1 +=  x[2] * y[1] */
    00356         acc1 += x2 * c0;
    00357         /* acc2 +=  x[3] * y[1] */
    00358         acc2 += x3 * c0;
    00359         /* acc3 +=  x[4] * y[1] */
    00360         acc3 += x0 * c0;
    00361
    00362         /* Read y[2] sample */
    00363         c0 = *(py++);
    00364
    00365         /* Read x[5] sample */
    00366         x1 = *(px++);
    00367
    00368         /* Perform the multiply-accumulates */
    00369         /* acc0 +=  x[2] * y[2] */
    00370         acc0 += x2 * c0;
    00371         /* acc1 +=  x[3] * y[2] */
    00372         acc1 += x3 * c0;
    00373         /* acc2 +=  x[4] * y[2] */
    00374         acc2 += x0 * c0;
    00375         /* acc3 +=  x[5] * y[2] */
    00376         acc3 += x1 * c0;
    00377
    00378         /* Read y[3] sample */
    00379         c0 = *(py++);
    00380
    00381         /* Read x[6] sample */
    00382         x2 = *(px++);
    00383
    00384         /* Perform the multiply-accumulates */
    00385         /* acc0 +=  x[3] * y[3] */
    00386         acc0 += x3 * c0;
    00387         /* acc1 +=  x[4] * y[3] */
    00388         acc1 += x0 * c0;
    00389         /* acc2 +=  x[5] * y[3] */
    00390         acc2 += x1 * c0;
    00391         /* acc3 +=  x[6] * y[3] */
    00392         acc3 += x2 * c0;
    00393
    00394
    00395       } while(--k);
    00396
    00397       /* If the srcBLen is not a multiple of 4, compute any remaining MACs here.
    00398        ** No loop unrolling is used. */
    00399       k = srcBLen % 0x4u;
    00400
    00401       while(k > 0u)
    00402       {
    00403         /* Read y[4] sample */
    00404         c0 = *(py++);
    00405
    00406         /* Read x[7] sample */
    00407         x3 = *(px++);
    00408
    00409         /* Perform the multiply-accumulates */
    00410         /* acc0 +=  x[4] * y[4] */
    00411         acc0 += x0 * c0;
    00412         /* acc1 +=  x[5] * y[4] */
    00413         acc1 += x1 * c0;
    00414         /* acc2 +=  x[6] * y[4] */
    00415         acc2 += x2 * c0;
    00416         /* acc3 +=  x[7] * y[4] */
    00417         acc3 += x3 * c0;
    00418
    00419         /* Reuse the present samples for the next MAC */
    00420         x0 = x1;
    00421         x1 = x2;
    00422         x2 = x3;
    00423
    00424         /* Decrement the loop counter */
    00425         k--;
    00426       }
    00427
    00428       /* Store the result in the accumulator in the destination buffer. */
    00429       *pOut = acc0;
    00430       /* Destination pointer is updated according to the address modifier, inc */
    00431       pOut += inc;
    00432
    00433       *pOut = acc1;
    00434       pOut += inc;
    00435
    00436       *pOut = acc2;
    00437       pOut += inc;
    00438
    00439       *pOut = acc3;
    00440       pOut += inc;
    00441
    00442       /* Update the inputA and inputB pointers for next MAC calculation */
    00443       px = pIn1 + (count * 4u);
    00444       py = pIn2;
    00445
    00446       /* Increment the pointer pIn1 index, count by 1 */
    00447       count++;
    00448
    00449       /* Decrement the loop counter */
    00450       blkCnt--;
    00451     }
    00452
    00453     /* If the blockSize2 is not a multiple of 4, compute any remaining output samples here.
    00454      ** No loop unrolling is used. */
    00455     blkCnt = blockSize2 % 0x4u;
    00456
    00457     while(blkCnt > 0u)
    00458     {
    00459       /* Accumulator is made zero for every iteration */
    00460       sum = 0.0f;
    00461
    00462       /* Apply loop unrolling and compute 4 MACs simultaneously. */
    00463       k = srcBLen >> 2u;
    00464
    00465       /* First part of the processing with loop unrolling.  Compute 4 MACs at a time.
    00466        ** a second loop below computes MACs for the remaining 1 to 3 samples. */
    00467       while(k > 0u)
    00468       {
    00469         /* Perform the multiply-accumulates */
    00470         sum += *px++ * *py++;
    00471         sum += *px++ * *py++;
    00472         sum += *px++ * *py++;
    00473         sum += *px++ * *py++;
    00474
    00475         /* Decrement the loop counter */
    00476         k--;
    00477       }
    00478
    00479       /* If the srcBLen is not a multiple of 4, compute any remaining MACs here.
    00480        ** No loop unrolling is used. */
    00481       k = srcBLen % 0x4u;
    00482
    00483       while(k > 0u)
    00484       {
    00485         /* Perform the multiply-accumulate */
    00486         sum += *px++ * *py++;
    00487
    00488         /* Decrement the loop counter */
    00489         k--;
    00490       }
    00491
    00492       /* Store the result in the accumulator in the destination buffer. */
    00493       *pOut = sum;
    00494       /* Destination pointer is updated according to the address modifier, inc */
    00495       pOut += inc;
    00496
    00497       /* Update the inputA and inputB pointers for next MAC calculation */
    00498       px = pIn1 + count;
    00499       py = pIn2;
    00500
    00501       /* Increment the pointer pIn1 index, count by 1 */
    00502       count++;
    00503
    00504       /* Decrement the loop counter */
    00505       blkCnt--;
    00506     }
    00507   }
    00508   else
    00509   {
    00510     /* If the srcBLen is not a multiple of 4,
    00511      * the blockSize2 loop cannot be unrolled by 4 */
    00512     blkCnt = blockSize2;
    00513
    00514     while(blkCnt > 0u)
    00515     {
    00516       /* Accumulator is made zero for every iteration */
    00517       sum = 0.0f;
    00518
    00519       /* Loop over srcBLen */
    00520       k = srcBLen;
    00521
    00522       while(k > 0u)
    00523       {
    00524         /* Perform the multiply-accumulate */
    00525         sum += *px++ * *py++;
    00526
    00527         /* Decrement the loop counter */
    00528         k--;
    00529       }
    00530
    00531       /* Store the result in the accumulator in the destination buffer. */
    00532       *pOut = sum;
    00533       /* Destination pointer is updated according to the address modifier, inc */
    00534       pOut += inc;
    00535
    00536       /* Update the inputA and inputB pointers for next MAC calculation */
    00537       px = pIn1 + count;
    00538       py = pIn2;
    00539
    00540       /* Increment the pointer pIn1 index, count by 1 */
    00541       count++;
    00542
    00543       /* Decrement the loop counter */
    00544       blkCnt--;
    00545     }
    00546   }
    00547
    00548   /* --------------------------
    00549    * Initializations of stage3
    00550    * -------------------------*/
    00551
    00552   /* sum += x[srcALen-srcBLen+1] * y[0] + x[srcALen-srcBLen+2] * y[1] +...+ x[srcALen-1] * y[srcBLen-1]
    00553    * sum += x[srcALen-srcBLen+2] * y[0] + x[srcALen-srcBLen+3] * y[1] +...+ x[srcALen-1] * y[srcBLen-1]
    00554    * ....
    00555    * sum +=  x[srcALen-2] * y[0] + x[srcALen-1] * y[1]
    00556    * sum +=  x[srcALen-1] * y[0]
    00557    */
    00558
    00559   /* In this stage the MAC operations are decreased by 1 for every iteration.
    00560      The count variable holds the number of MAC operations performed */
    00561   count = srcBLen - 1u;
    00562
    00563   /* Working pointer of inputA */
    00564   pSrc1 = pIn1 + (srcALen - (srcBLen - 1u));
    00565   px = pSrc1;
    00566
    00567   /* Working pointer of inputB */
    00568   py = pIn2;
    00569
    00570   /* -------------------
    00571    * Stage3 process
    00572    * ------------------*/
    00573
    00574   while(blockSize3 > 0u)
    00575   {
    00576     /* Accumulator is made zero for every iteration */
    00577     sum = 0.0f;
    00578
    00579     /* Apply loop unrolling and compute 4 MACs simultaneously. */
    00580     k = count >> 2u;
    00581
    00582     /* First part of the processing with loop unrolling.  Compute 4 MACs at a time.
    00583      ** a second loop below computes MACs for the remaining 1 to 3 samples. */
    00584     while(k > 0u)
    00585     {
    00586       /* Perform the multiply-accumulates */
    00587       /* sum += x[srcALen - srcBLen + 4] * y[3] */
    00588       sum += *px++ * *py++;
    00589       /* sum += x[srcALen - srcBLen + 3] * y[2] */
    00590       sum += *px++ * *py++;
    00591       /* sum += x[srcALen - srcBLen + 2] * y[1] */
    00592       sum += *px++ * *py++;
    00593       /* sum += x[srcALen - srcBLen + 1] * y[0] */
    00594       sum += *px++ * *py++;
    00595
    00596       /* Decrement the loop counter */
    00597       k--;
    00598     }
    00599
    00600     /* If the count is not a multiple of 4, compute any remaining MACs here.
    00601      ** No loop unrolling is used. */
    00602     k = count % 0x4u;
    00603
    00604     while(k > 0u)
    00605     {
    00606       /* Perform the multiply-accumulates */
    00607       sum += *px++ * *py++;
    00608
    00609       /* Decrement the loop counter */
    00610       k--;
    00611     }
    00612
    00613     /* Store the result in the accumulator in the destination buffer. */
    00614     *pOut = sum;
    00615     /* Destination pointer is updated according to the address modifier, inc */
    00616     pOut += inc;
    00617
    00618     /* Update the inputA and inputB pointers for next MAC calculation */
    00619     px = ++pSrc1;
    00620     py = pIn2;
    00621
    00622     /* Decrement the MAC count */
    00623     count--;
    00624
    00625     /* Decrement the loop counter */
    00626     blockSize3--;
    00627   }
    00628
    00629 #else
    00630
    00631   /* Run the below code for Cortex-M0 */
    00632
    00633   float32_t *pIn1 = pSrcA;                       /* inputA pointer */
    00634   float32_t *pIn2 = pSrcB + (srcBLen - 1u);      /* inputB pointer */
    00635   float32_t sum;                                 /* Accumulator */
    00636   uint32_t i = 0u, j;                            /* loop counters */
    00637   uint32_t inv = 0u;                             /* Reverse order flag */
    00638   uint32_t tot = 0u;                             /* Length */
    00639
    00640   /* The algorithm implementation is based on the lengths of the inputs. */
    00641   /* srcB is always made to slide across srcA. */
    00642   /* So srcBLen is always considered as shorter or equal to srcALen */
    00643   /* But CORR(x, y) is reverse of CORR(y, x) */
    00644   /* So, when srcBLen > srcALen, output pointer is made to point to the end of the output buffer */
    00645   /* and a varaible, inv is set to 1 */
    00646   /* If lengths are not equal then zero pad has to be done to  make the two
    00647    * inputs of same length. But to improve the performance, we include zeroes
    00648    * in the output instead of zero padding either of the the inputs*/
    00649   /* If srcALen > srcBLen, (srcALen - srcBLen) zeroes has to included in the
    00650    * starting of the output buffer */
    00651   /* If srcALen < srcBLen, (srcALen - srcBLen) zeroes has to included in the
    00652    * ending of the output buffer */
    00653   /* Once the zero padding is done the remaining of the output is calcualted
    00654    * using convolution but with the shorter signal time shifted. */
    00655
    00656   /* Calculate the length of the remaining sequence */
    00657   tot = ((srcALen + srcBLen) - 2u);
    00658
    00659   if(srcALen > srcBLen)
    00660   {
    00661     /* Calculating the number of zeros to be padded to the output */
    00662     j = srcALen - srcBLen;
    00663
    00664     /* Initialise the pointer after zero padding */
    00665     pDst += j;
    00666   }
    00667
    00668   else if(srcALen < srcBLen)
    00669   {
    00670     /* Initialization to inputB pointer */
    00671     pIn1 = pSrcB;
    00672
    00673     /* Initialization to the end of inputA pointer */
    00674     pIn2 = pSrcA + (srcALen - 1u);
    00675
    00676     /* Initialisation of the pointer after zero padding */
    00677     pDst = pDst + tot;
    00678
    00679     /* Swapping the lengths */
    00680     j = srcALen;
    00681     srcALen = srcBLen;
    00682     srcBLen = j;
    00683
    00684     /* Setting the reverse flag */
    00685     inv = 1;
    00686
    00687   }
    00688
    00689   /* Loop to calculate convolution for output length number of times */
    00690   for (i = 0u; i <= tot; i++)
    00691   {
    00692     /* Initialize sum with zero to carry on MAC operations */
    00693     sum = 0.0f;
    00694
    00695     /* Loop to perform MAC operations according to convolution equation */
    00696     for (j = 0u; j <= i; j++)
    00697     {
    00698       /* Check the array limitations */
    00699       if((((i - j) < srcBLen) && (j < srcALen)))
    00700       {
    00701         /* z[i] += x[i-j] * y[j] */
    00702         sum += pIn1[j] * pIn2[-((int32_t) i - j)];
    00703       }
    00704     }
    00705     /* Store the output in the destination buffer */
    00706     if(inv == 1)
    00707       *pDst-- = sum;
    00708     else
    00709       *pDst++ = sum;
    00710   }
    00711
    00712 #endif /*   #ifndef ARM_MATH_CM0 */
    00713
    00714 }
    00715

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