c11_fir.c

dsp6713开发板的许多例程.对入门特别有用

/****************************************************************************/
/*         Copyright (C) 1996-2000 Texas Instruments Incorporated           */
/*                      All Rights Reserved                                 */
/* C11_FIR   -  FINITE IMPULSE RESPONSE FILTER                              */
/****************************************************************************/
#include <stdio.h>
#include <time.h>

short c[100];

short a[132] = { -2, 668, -10, 6019, 531, -3950, -275, 54, -1, -41,
                 -6, -536, 1, 20, -10, -7564, 1918, -1095, 268, -3,
                 56, -25, 1069, 0, -20, 61, -2380, -1, 60, 6845,
                 250, -49, -3038, -1001, -3, -12596, 39, -6, 0, -23386,
                 -22, -74, 25, -5, -3847, 7007, -1, 12, -103, 12,
                 5, -353, 7, -186, 504, -549, 4, 11, -1, -23,
                 668, -691, -7822, 125, -3929, -1, -2077, 3, 121, -1,
                 -6, 0, -4, 1020, 517, -992, -1021, -12, 7050, 2,
                 5829, -124, 17, 213, -158, -114, -53, -2516, -1, -224,
                 2709, 772, -7603, 148, -6, -88, 198, 438, -124, -62,
                 -125, -13, -6169, -3, 6762, 52, 2, -1, 0, 9,
                 17793, 21, 27, 476, -36, 483, -9, -40, 417, 205,
                 -4185, -152, -3814, 1503, 2, -1, 12, 4, 1595, -171,
                 -17, 421 }; 
 
short b[100] = { 2837, -77, 0, -4824, -1, 786, -737, -14, -935, -3,
                 0, 2, -22, -1, 1, 0, 240, -6768, -1, -6086,
                 74, -1, -22, -1386, 10, 1193, 121, -54, -568, 215,
                 -5206, 1, 0, -2, 711, 1686, 0, -1, -17, -28424,
                 -47, 76, -185, 191, -57, 29, -17, 662, -1196, -81,
                 25072, 1656, 6, -43, 19920, -839, 265, -9, -22, 192,
                 23728, 29276, 327, 232, 714, -1, -1, 0, 537, 15445,
                 6, -81, -100, -619, -10993, 1, -9642, 107, -1000, -911,
                 -1483, -20, -11547, 3, -1432, -2, 1, 76, -546, -14713,
                 -19, 1, -1, 31, 0, -3106, 2, 1204, -455, -127 }; 
 
int ret_stub, ret_asm, ret_sa;

clock_t time_stub (int *);
clock_t time_asm  (int *);
clock_t time_sa   (int *);

/****************************************************************************/
/* TOP LEVEL DRIVER FOR THE TEST.                                           */
/****************************************************************************/
int main()
{
    clock_t t_overhead, t_start, t_stop, t_stub, t_asm, t_sa;
 
    /************************************************************************/
    /* COMPUTE THE OVERHEAD OF CALLING CLOCK TWICE TO GET TIMING INFO.      */
    /************************************************************************/
    t_start    = clock();
    t_stop     = clock();
    t_overhead = t_stop - t_start;

    /************************************************************************/
    /* CALL THE INDIVIDIUAL TIMING ROUTINES.                                */
    /************************************************************************/
    t_stub    = time_stub(&ret_stub) - t_overhead;
    t_asm     = time_asm(&ret_asm)   - t_overhead;
    t_sa      = time_sa(&ret_sa)     - t_overhead;
    
    /************************************************************************/
    /* PRINT TIMING RESULTS                                                 */ 
    /************************************************************************/ 
    printf("FIR2 Assembly Clock Cycles:           %d\n", t_asm - t_stub);
    printf("FIR2 Assembly Optimizer Clock Cycles: %d\n", t_sa  - t_stub);
}

int fir_stub(const short x[], const short h[], short y[])
{
    asm("* comment to defeat inlining");
    return 0;
}

/****************************************************************************/
/* COMPUTE THE ELAPSED TIME OF THE STUB ROUTINE                             */
/****************************************************************************/
clock_t time_stub(int *i)
{
    clock_t t_start, t_stop;

    t_start = clock();
    *i      = fir_stub(a, b, c);
    t_stop  = clock();
    return  t_stop - t_start;
}

/****************************************************************************/
/* COMPUTE THE ELAPSED TIME OF THE HAND CODED ASSEMBLY ROUTINE              */
/****************************************************************************/
clock_t time_asm(int *i)
{
    clock_t t_start, t_stop;

    t_start = clock();
    *i      = fir_asm(a, b, c);
    t_stop  = clock();
    return  t_stop - t_start;
}

/****************************************************************************/
/* COMPUTE THE ELAPSED TIME OF THE ASSEMBLY OPTIMIZER ROUTINE               */
/****************************************************************************/
clock_t time_sa(int *i)
{
    clock_t t_start, t_stop;

    t_start = clock();
    *i      = fir_sa(a, b, c);
    t_stop  = clock();
    return  t_stop - t_start;
}

/* Sample C code
void fir_n(const short x[], const short h[], short y[])
{
    int i, j, sum;
        
    for (j = 0; j < 100; j++) 
    {
        sum = 0;
        for (i = 0; i < 32; i++)
            sum += x[i + j] * h[i];
        y[j] = sum >> 15;
    }
}

void fir(const short x[], const short h[], short y[])
{
    int i, j, sum0, sum1;
    short x0,x1,x2,x3,h0,h1,h2,h3;
        
    for (j = 0; j < 100; j+=2) 
    {
        sum0 = 0;
        sum1 = 0;
        x0 = x[j];
        for (i = 0; i < 32; i+=4)
        {
            x1 = x[j+i+1];
            h0 = h[i];
            sum0 += x0 * h0;
            sum1 += x1 * h0;
            x2 = x[j+i+2];
            h1 = h[i+1];
            sum0 += x1 * h1;
            sum1 += x2 * h1;
            x3 = x[j+i+3];
            h2 = h[i+2];
            sum0 += x2 * h2;
            sum1 += x3 * h2;
            x0 = x[j+i+4];
            h3 = h[i+3];
            sum0 += x3 * h3;
            sum1 += x0 * h3;
        }
        y[j] = sum0 >> 15;
        y[j+1] = sum1 >> 15;
    }
}
*/