Re: user-mode port 0.44-2.4.7

From: Richard Gooch (
Date: Mon Jul 23 2001 - 16:50:54 EST

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 ");


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