Interesting gettimeofday() on x86_64

During doing strace() on application I found that there are no gettimeofday() syscalls. That's nothing new, for x86_64 experts, but it's interesting for me.

Here is an example of the code:

#include <stdio.h>
int main(){
        printf("start\n");
        gettimeofday(NULL,NULL);
        printf("stop\n");
        return(0);
}

Sample strace from i386:

...
write(1, "start\n", 6)                  = 6
gettimeofday(NULL, NULL)                = 0
write(1, "stop\n", 5)                   = 5
...

And the same code on x86_64:

...
write(1, "start\n", 6)                  = 6
write(1, "stop\n", 5)                   = 5
...