Re: [microblaze-uclinux] another compiler oddity

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

I wrote
> 
> A cosmetically modified version of your test program (see attached) 
> gives me this result:

oops sorry - here's the file.

John
#include <stdio.h>
#include <sys/time.h>
#include <sys/times.h>

#define BRAM_START 0x00001000
#define BRAM_SIZE  0x00001000
#define NR_TEST    100000

volatile unsigned char dram[BRAM_SIZE];
volatile unsigned char *bram=(unsigned char *)BRAM_START;

struct timeval start, stop;
void print_time(void)
{
        time_t sec;
        suseconds_t usec;

        sec  = stop.tv_sec  - start.tv_sec;
        usec = stop.tv_usec - start.tv_usec;
        if(usec < 0){
                usec += 1000000;
                sec--;
        }
        printf("Elapsed time : %ld.%ld\n", sec, usec);
}

static void do_test(volatile unsigned char *addr)
{
        int i,j;

        gettimeofday(&start, NULL);
        for (i=0; i<NR_TEST; i++)
                *(addr) = i;
        gettimeofday(&stop, NULL);
        print_time();
}

static inline void do_test_inline(volatile unsigned char *addr)
{
        int i,j;

        gettimeofday(&start, NULL);
        for (i=0; i<NR_TEST; i++)
                *(addr) = i;
        gettimeofday(&stop, NULL);
        print_time();
}

int main(void)
{
	printf("DRAM test\n");
	printf("do_test_inline():\n");
        do_test(dram);
	printf("do_test():\n");
	do_test_inline(dram);

	printf("\n\nBRAM test\n");
	printf("do_test_inline():\n");
        do_test_inline(bram);
	printf("do_test()\n");
	do_test(bram);

        return 0;
}