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Re: [PATCH] Fix DCE REG_LIBCALL note moving from noop move insns (PR rtl-optimization/33644)
On 10/18/07, Eric Botcazou <ebotcazou@libertysurf.fr> wrote:
> > If you don't see the practical advantage of being able to determine
> > whether an insn is part of a libcall without having to walk the entire
> > function to figure out whether you are allowed to touch an insn,
> > please just remove it.
>
> I've posted a patch to that effect. It restores the correct interpretation of
> libcall notes as optimization helpers rather than optimization barriers as
> far as DCE is concerned and, thus, eliminates the need for being able to
> determine whether an insn is part of a libcall in dce.c.
>
> But I won't install it myself, given how controversial this issue has become.
> I therefore propose that a 3rd party decides here, and I'd suggest Jakub.
FWIW, I think your patch is the typical "less than ideal but the best
we can do now" kind of solution.
Gr.
Steven