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# arm_mat_mult_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_mat_mult_f32.c
    00009 *
    00010 * Description:  Floating-point matrix 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 * Version 0.0.5  2010/04/26
    00030 *    incorporated review comments and updated with latest CMSIS layer
    00031 *
    00032 * Version 0.0.3  2010/03/10
    00033 *    Initial version
    00034 * -------------------------------------------------------------------- */
    00035
    00036 #include "arm_math.h"
    00037
    00073 arm_status arm_mat_mult_f32(
    00074   const arm_matrix_instance_f32 * pSrcA,
    00075   const arm_matrix_instance_f32 * pSrcB,
    00076   arm_matrix_instance_f32 * pDst)
    00077 {
    00078   float32_t *pIn1 = pSrcA->pData;                /* input data matrix pointer A */
    00079   float32_t *pIn2 = pSrcB->pData;                /* input data matrix pointer B */
    00080   float32_t *pInA = pSrcA->pData;                /* input data matrix pointer A  */
    00081   float32_t *pOut = pDst->pData;                 /* output data matrix pointer */
    00082   float32_t *px;                                 /* Temporary output data matrix pointer */
    00083   float32_t sum;                                 /* Accumulator */
    00084   uint16_t numRowsA = pSrcA->numRows;            /* number of rows of input matrix A */
    00085   uint16_t numColsB = pSrcB->numCols;            /* number of columns of input matrix B */
    00086   uint16_t numColsA = pSrcA->numCols;            /* number of columns of input matrix A */
    00087
    00088 #ifndef ARM_MATH_CM0
    00089
    00090   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00091
    00092   uint16_t col, i = 0u, j, row = numRowsA, colCnt;      /* loop counters */
    00093   arm_status status;                             /* status of matrix multiplication */
    00094
    00095 #ifdef ARM_MATH_MATRIX_CHECK
    00096
    00097
    00098   /* Check for matrix mismatch condition */
    00099   if((pSrcA->numCols != pSrcB->numRows) ||
    00100      (pSrcA->numRows != pDst->numRows) || (pSrcB->numCols != pDst->numCols))
    00101   {
    00102
    00103     /* Set status as ARM_MATH_SIZE_MISMATCH */
    00104     status = ARM_MATH_SIZE_MISMATCH;
    00105   }
    00106   else
    00107 #endif /*      #ifdef ARM_MATH_MATRIX_CHECK    */
    00108
    00109   {
    00110     /* The following loop performs the dot-product of each row in pSrcA with each column in pSrcB */
    00111     /* row loop */
    00112     do
    00113     {
    00114       /* Output pointer is set to starting address of the row being processed */
    00115       px = pOut + i;
    00116
    00117       /* For every row wise process, the column loop counter is to be initiated */
    00118       col = numColsB;
    00119
    00120       /* For every row wise process, the pIn2 pointer is set
    00121        ** to the starting address of the pSrcB data */
    00122       pIn2 = pSrcB->pData;
    00123
    00124       j = 0u;
    00125
    00126       /* column loop */
    00127       do
    00128       {
    00129         /* Set the variable sum, that acts as accumulator, to zero */
    00130         sum = 0.0f;
    00131
    00132         /* Initiate the pointer pIn1 to point to the starting address of the column being processed */
    00133         pIn1 = pInA;
    00134
    00135         /* Apply loop unrolling and compute 4 MACs simultaneously. */
    00136         colCnt = numColsA >> 2;
    00137
    00138         /* matrix multiplication        */
    00139         while(colCnt > 0u)
    00140         {
    00141           /* c(m,n) = a(1,1)*b(1,1) + a(1,2) * b(2,1) + .... + a(m,p)*b(p,n) */
    00142           sum += *pIn1++ * (*pIn2);
    00143           pIn2 += numColsB;
    00144           sum += *pIn1++ * (*pIn2);
    00145           pIn2 += numColsB;
    00146           sum += *pIn1++ * (*pIn2);
    00147           pIn2 += numColsB;
    00148           sum += *pIn1++ * (*pIn2);
    00149           pIn2 += numColsB;
    00150
    00151           /* Decrement the loop count */
    00152           colCnt--;
    00153         }
    00154
    00155         /* If the columns of pSrcA is not a multiple of 4, compute any remaining MACs here.
    00156          ** No loop unrolling is used. */
    00157         colCnt = numColsA % 0x4u;
    00158
    00159         while(colCnt > 0u)
    00160         {
    00161           /* c(m,n) = a(1,1)*b(1,1) + a(1,2) * b(2,1) + .... + a(m,p)*b(p,n) */
    00162           sum += *pIn1++ * (*pIn2);
    00163           pIn2 += numColsB;
    00164
    00165           /* Decrement the loop counter */
    00166           colCnt--;
    00167         }
    00168
    00169         /* Store the result in the destination buffer */
    00170         *px++ = sum;
    00171
    00172         /* Update the pointer pIn2 to point to the  starting address of the next column */
    00173         j++;
    00174         pIn2 = pSrcB->pData + j;
    00175
    00176         /* Decrement the column loop counter */
    00177         col--;
    00178
    00179       } while(col > 0u);
    00180
    00181 #else
    00182
    00183   /* Run the below code for Cortex-M0 */
    00184
    00185   float32_t *pInB = pSrcB->pData;                /* input data matrix pointer B */
    00186   uint16_t col, i = 0u, row = numRowsA, colCnt;  /* loop counters */
    00187   arm_status status;                             /* status of matrix multiplication */
    00188
    00189 #ifdef ARM_MATH_MATRIX_CHECK
    00190
    00191   /* Check for matrix mismatch condition */
    00192   if((pSrcA->numCols != pSrcB->numRows) ||
    00193      (pSrcA->numRows != pDst->numRows) || (pSrcB->numCols != pDst->numCols))
    00194   {
    00195
    00196     /* Set status as ARM_MATH_SIZE_MISMATCH */
    00197     status = ARM_MATH_SIZE_MISMATCH;
    00198   }
    00199   else
    00200 #endif /*      #ifdef ARM_MATH_MATRIX_CHECK    */
    00201
    00202   {
    00203     /* The following loop performs the dot-product of each row in pInA with each column in pInB */
    00204     /* row loop */
    00205     do
    00206     {
    00207       /* Output pointer is set to starting address of the row being processed */
    00208       px = pOut + i;
    00209
    00210       /* For every row wise process, the column loop counter is to be initiated */
    00211       col = numColsB;
    00212
    00213       /* For every row wise process, the pIn2 pointer is set
    00214        ** to the starting address of the pSrcB data */
    00215       pIn2 = pSrcB->pData;
    00216
    00217       /* column loop */
    00218       do
    00219       {
    00220         /* Set the variable sum, that acts as accumulator, to zero */
    00221         sum = 0.0f;
    00222
    00223         /* Initialize the pointer pIn1 to point to the starting address of the row being processed */
    00224         pIn1 = pInA;
    00225
    00226         /* Matrix A columns number of MAC operations are to be performed */
    00227         colCnt = numColsA;
    00228
    00229         while(colCnt > 0u)
    00230         {
    00231           /* c(m,n) = a(1,1)*b(1,1) + a(1,2) * b(2,1) + .... + a(m,p)*b(p,n) */
    00232           sum += *pIn1++ * (*pIn2);
    00233           pIn2 += numColsB;
    00234
    00235           /* Decrement the loop counter */
    00236           colCnt--;
    00237         }
    00238
    00239         /* Store the result in the destination buffer */
    00240         *px++ = sum;
    00241
    00242         /* Decrement the column loop counter */
    00243         col--;
    00244
    00245         /* Update the pointer pIn2 to point to the  starting address of the next column */
    00246         pIn2 = pInB + (numColsB - col);
    00247
    00248       } while(col > 0u);
    00249
    00250 #endif /* #ifndef ARM_MATH_CM0 */
    00251
    00252       /* Update the pointer pInA to point to the  starting address of the next row */
    00253       i = i + numColsB;
    00254       pInA = pInA + numColsA;
    00255
    00256       /* Decrement the row loop counter */
    00257       row--;
    00258
    00259     } while(row > 0u);
    00260     /* Set status as ARM_MATH_SUCCESS */
    00261     status = ARM_MATH_SUCCESS;
    00262   }
    00263
    00264   /* Return to application */
    00265   return (status);
    00266 }
    00267

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