> In my program I observe that, with -O2 flag turned on,
> Program 1 behaves
> like Program 2. And without O2, their outputs are different.
>
> Is it the desirable behaviour? For my program, I did not expect the
> optimizer to do this transformation.
-O2 should not change the behaviour of the program, except where the
behaviour is dependent on external factors (eg. I/O) or when the program
uses unsafePerformIO. If that's not the case, could you send us the
code so we can take a look?
Cheers,
Simon
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