TI C64x系列DSP时间计量

来源：互联网发布：软件行业数据编辑：程序博客网时间：2024/04/28 02:36

http://hi.baidu.com/myyb/blog/item/e1071dce1878d032b700c8c7.html

TI C64x可以有两种方法来得到程序的运行cycle,一个是Enable clock后调用用clock()(这个在VC下是得到以ms为单位的时间，这里得到的是cycle),另一个就是CSL（Chip Support Library）提供的timer。

下面给出两种方法的程序段

/**************************************************************/

/* */

/* Auth:wb0330 */

/* Dest: used to measure cycle counts for TI C64x DSP */

/* Support by: http://hi.baidu.com/videocodec */

/* or QQ group: 24960630,10714050, 11216191 */

/* */

/**************************************************************/

#include <stdio.h>

#include <time.h>/* need time.h in order to call clock()*/

int main()

{

unsigned int start,stop, overhead,cycles;

/*––––––––––––––––––––––––––*/

/* The following example demonstrates how to include */

/* the clock() function in your C code. */

/*––––––––––––––––––––––– – –*/

start = clock(); /* Calculate overhead of calling clock*/

stop = clock(); /* and subtract this value from The results*/

overhead = stop - start;

start = clock();

/* ––––––––––––––––––––––––––*/

/* Call a function here. */

/* ––––––––––––––––––––––––––*/

stop = clock();

cycles = stop - start - overhead;

printf( “cycles: %d /n ” , cycles);

printf("times: %.2f s with cpu 600MHz, /n",((float) cycles /(float)600000000));

// clock() end

return 0;

}

这里给出CSL_Timer 部分的

/**************************************************************/

/* */

/* Auth:wb0330 */

/* Dest: used to measure cycle counts for TI C64x DSP */

/* Support by: http://hi.baidu.com/videocodec */

/* or QQ group:24960630, 10714050, 11216191 */

/* */

/**************************************************************/

#include <stdio.h>

#include "csl.h"

#include "csl_timer.h"

int main()

{

TIMER_Handle hTimer;

unsigned int start,stop, overhead，diff,cycles;

/*––––––––––––––––––––––––––––––––––*/

/* The following sample code shows how to set up the timer */

/* and measure cycle counts with Chip Support Library (CSL) */

/*––––––––––––––––––––––––––––––––––*/

hTimer = TIMER_open(TIMER_DEVANY,0); /* open a timer */

/*––––––––––––––––––––––––––––––––––*/

/* Configure the timer. count corresponds to 8 CPU cycles in C64 */

/*––––––––––––––––––––––––––––––––––*/

/* control period initial value */

TIMER_configArgs(hTimer, 0x000002C0, 0xFFFFFFFF, 0x00000000);

/* ––––––––––––––––––––––––––––––––––*/

/* Compute the overhead of calling the timer. */

/* ––––––––––––––––––––––––––––––––––*/

start = TIMER_getCount(hTimer); /* to remove L1P miss overhead */

start = TIMER_getCount(hTimer);

stop = TIMER_getCount(hTimer);

overhead = stop - start;

start = TIMER_getCount(hTimer);

/* ––––––––––––––––––––––––––––––––––*/

/* Call a function here. */

/* ––––––––––––––––––––––––––––––––––*/

diff = (TIMER_getCount(hTimer) - start) - overhead;

TIMER_close(hTimer);

cycles =diff*8;

printf( “cycles %d /n”,cycles);

printf("times: %.2f s with cpu 600MHz, /n",((float) cycles /(float)600000000));

// The maximum resolution of the timer is 8 CPU cycles, since the input clock to

// the timer is fixed to the CPU clock divided by eight

// CSL_timer end

return 0;

}