[Bug c/81774] Volatile - order of reads in generated code

[pj at hugeone dot co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81774

--- Comment #3 from Piotr <pj at hugeone dot co.uk> ---
And what about if volatile variable changes during the multiplications. Mybe
not in this example but if y was declared global - it can be interrupted
between multiplications.

volatile int y;


int x3(int x)
{
        return y * y * y * y;
}