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Re: {PING] [PATCH] Sign extension elimination
On Thu, Apr 20, 2006 at 10:23:21AM -0700, Mark Mitchell wrote:
> H. J. Lu wrote:
> > On Thu, Apr 20, 2006 at 09:39:23AM -0700, Mark Mitchell wrote:
> >> I'm not finding this discussion very illuminating.
> >>
> >> I'm trying to understand whether the current SEE pass is ready for
> >> inclusion in the compiler. Roger has approved it on technical merits,
> >> but HJ has raised the issue that somehow this pass is a bad thing for
> >> x86-64.
> >
> > The current SEE implemented isn't designed for x86-64 and doesn't help
> > x86-64 at all, if it doesn't make it worse on x86-64. But its
> > infrastructure is needed for future x86-64 SEE work.
>
> OK. So, then, there's no problem with incorporating the SEE
> implementation, and we proceed with that.
>
Oh, it shouldn't be enabled for a target with any -On unless we can
demonstrate it does something useful.
H.J.