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Re: Whole program optimization and functions-only-called-once.
>
> I think Tom patched GCC to inline every called-once function into a gigantic
> main function and the ineffiency is not from recording exit edges but from
> allocating the IRA bitmaps for each loop in advance (compared to for
> BBs where we seem to set them simply to NULL).
Yep, I don't expect patch to solve the problem, just it seemed natural thing to
do since enumeration of exists is quite ineffecient otherwise (O(loop body
size) instead of O(num exists))
>
> Richard.