How to avoid optimization of inline assembly?

[nospam]

Dear sir,

        Consider the following code on ARM platform:

#include <stdio.h>
#include <stdlib.h>

static void
my_memcpy(void *dest, void *src, int num_short_to_cpy,
          int num_to_repeat) {
    // Note: dest=r0, src=r1, num_short_to_cpy=r2, num_to_repeat=r3;

    asm (
        ";
.L_MEMCPY0:;
        cmp  r2, #0;
        ble  .L_MEMCPY3;
        ldrb r4, [r1], #1;
        ldrb r5, [r1], #1;
        mov  r6, r3;
.L_MEMCPY1:;
        cmp  r6, #0;
        ble  .L_MEMCPY2;
        strb r4, [r0], #1;
        strb r5, [r0], #1;
        sub  r6, r6, #1;
        b    .L_MEMCPY1;
.L_MEMCPY2:;
        sub  r2, r2, #1;
        b    .L_MEMCPY0;
.L_MEMCPY3:;"
             :
             :
             :"r4", "r5", "r6"      /*reserve r4 and r5*/
    );
}

int
main(int argc, char **argv) {
    short a[10]={0xABCD, 0x1234, 0x5678};
    short b[10];
    my_memcpy(b, a, 2, 2);
    fprintf(stderr, "hello\n");
    fprintf(stderr, "%x %x %x %x\n", a[0], a[1], a[2], a[3]);
    fprintf(stderr, "%x %x %x %x\n", b[0], b[1], b[2], b[3]);
    // fprintf(stderr, "%s\n", a);
    // fprintf(stderr, "%s\n", b);
}

	I tried to compile the code with -O3 flag and somehow all the inline 
assembly code are "optimized" which I optimized myself.

        How can i prevent the inline assembly from being "optimized"?

Yick


-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----==  Over 100,000 Newsgroups - 19 Different Servers! =-----