Re: [PATCH Atom][PR middle-end/44382] Tree reassociation improvement

[Ilya Enkovich <enkovich dot gnu at gmail dot com>]

>
> You need the target hook that tells how big the reassociation based on the
> type. ?Machines have different numbers of functional units, for example, maybe
> 3 integer units and 2 floating point units. ?For example, in the PowerPC, I
> would set the basic integer and binary floating point types to 2 to match the
> dispatch rules, but for decimal floating point, I would set it to one, since
> the machines currently only have 1 decimal unit.
>
> With the hook, I could see eliminating the switch and/or --param altogether,
> and doing only in the hook.
>

Hook introduced by this patch meets these requirements. But I think it
is useful to have option to override the hook because you cannot tune
it perfectly for each case.

Ilya