Re: user-mode port 0.44-2.4.7

[Richard Gooch]

Andrea Arcangeli writes:
> cases if the code breaks in the actual usages of xtime it is likely that
> gcc is doing something stupid in terms of performance. but GCC if it
> wants to is allowed to compile this code:
> 
> 	printf("%lx\n", xtime.tv_sec);
> 
> as:
> 
> 	unsigned long sec = xtime.tv_sec;
> 	if (sec != xtime.tv_sec)
> 		BUG();
> 	printf("%lx\n", sec);

And if it does that, it's stupid. Why on earth would GCC add extra
code to check if a value hasn't changed? I want it to produce
efficient code. What's next? Wrap checking?
    printk ("You've just wrapped an integer: press [ENTER] to confirm,
	    [NT] to ignore   ");

				Regards,

					Richard....
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