Re: 8259A initialization with AMD SC520 chip (586)

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Tue May 23 2000 - 13:31:02 EDT

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    > (Use your imagination, preferably in C++). So GCC had a policy change
    > (after many years!) and now it removes empty loops.
    >
    > I don't know if it removes _explicit_ empty loops though.

    It does. A few kernel drivers got burned by that.

    It will optimise

            int l=1000;
            while(l--);

    but not

            volatile int l=1000;
            while(l--);

    Alan

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