dsp_mat_trans.h64

来自「dm642函数库」· H64 代码 · 共 107 行

;* ======================================================================== *;
;*  TEXAS INSTRUMENTS, INC.                                                 *;
;*                                                                          *;
;*  DSPLIB  DSP Signal Processing Library                                   *;
;*                                                                          *;
;*      Release:        Revision 1.04b                                      *;
;*      CVS Revision:   1.8     Sun Sep 29 03:32:25 2002 (UTC)              *;
;*      Snapshot date:  23-Oct-2003                                         *;
;*                                                                          *;
;*  This library contains proprietary intellectual property of Texas        *;
;*  Instruments, Inc.  The library and its source code are protected by     *;
;*  various copyrights, and portions may also be protected by patents or    *;
;*  other legal protections.                                                *;
;*                                                                          *;
;*  This software is licensed for use with Texas Instruments TMS320         *;
;*  family DSPs.  This license was provided to you prior to installing      *;
;*  the software.  You may review this license by consulting the file       *;
;*  TI_license.PDF which accompanies the files in this library.             *;
;* ------------------------------------------------------------------------ *;
;*          Copyright (C) 2003 Texas Instruments, Incorporated.             *;
;*                          All Rights Reserved.                            *;
;* ======================================================================== *;
;* ======================================================================== *;
;*  Assembler compatibility shim for assembling 4.30 and later code on      *;
;*  tools prior to 4.30.                                                    *;
;* ======================================================================== *;
;* ======================================================================== *;
;*  End of assembler compatibility shim.                                    *;
;* ======================================================================== *;
* ========================================================================= *
*     TEXAS INSTRUMENTS, INC.                                               *
*                                                                           *
*     NAME                                                                  *
*           DSP_mat_trans                                                   *
*                                                                           *
*     REVISION DATE                                                         *
*         17-Feb-2002                                                       *
*                                                                           *
*   USAGE                                                                   *
*       This routine is C-callable and can be called as:                    *
*                                                                           *
*       void DSP_mat_trans(const short *x, short rows, short columns, short *r) *
*                                                                           *
*       x       : Pointer to input matrix containing 16-bit elements        *
*       rows    : Number of rows in matrix                                  *
*       columns : Number of columnss in matrix                              *
*       r       : Pointer to output matrix (transpose of input matrix)      *
*                                                                           *
*   DESCRIPTION                                                             *
*       The program transposes a matrix of 16-bit values and user-          *
*       determined dimensions. The result of a matrix transpose is a        *
*       matrix with the number of rows = number of columns of input matrix  *
*       and number of columns = number of rows of input matrix The value    *
*       of an elements of the output matrix is equal to the value of the    *
*       element from the input matrix with switched coordinates (rows,      *
*       columns).                                                           *
*                                                                           *
*     C CODE                                                                *
*         void DSP_mat_trans(short *x, short rows, short columns, short *r) *
*         {                                                                 *
*             short i,j;                                                    *
*             for(i=0; i<columns; i++)                                      *
*                 for(j=0; j<rows; j++)                                     *
*                     *(r+i*rows+j)=*(x+i+columns*j);                       *
*         }                                                                 *
*                                                                           *
*     TECHNIQUES                                                            *
*         Data from four adjacent rows, spaced columns apart are read, and  *
*         local 4x4 transpose is performed in the register file. This leads *
*         to four double words, that are "rows" apart. These loads and      *
*         stores can cause bank conflicts, hence non-aligned loads and      *
*         stores are used.                                                  *
*                                                                           *
*     ASSUMPTIONS                                                           *
*         rows and columns must be a multiple of 4                          *
*                                                                           *
*     NOTES                                                                 *
*         LITTLE ENDIAN Configuration used.                                 *
*                                                                           *
*         This code is interruptible throughout as it is single register    *
*         assignment code.                                                  *
*                                                                           *
*     CYCLES                                                                *
*         (0.5 * rows + 2.0) * cols + 11                                    *
*                                                                           *
*         rows = 20, cols = 12, cycles = 153                                *
*                                                                           *
*         This includes 6 cycles function call overhead.  This may vary     *
*         depending on compiler options.                                    *
*                                                                           *
*     CODESIZE                                                              *
*         224 bytes                                                         *
*                                                                           *
* ------------------------------------------------------------------------- *
*             Copyright (c) 2003 Texas Instruments, Incorporated.           *
*                            All Rights Reserved.                           *
* ========================================================================= *

        .global _DSP_mat_trans

* ========================================================================= *
*   End of file:  dsp_mat_trans.h64                                         *
* ------------------------------------------------------------------------- *
*             Copyright (c) 2003 Texas Instruments, Incorporated.           *
*                            All Rights Reserved.                           *
* ========================================================================= *