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Re: RFA (fold): PATCH for c++/49290 (folding *(T*)(ar+10))
On Fri, 17 Jun 2011, Michael Matz wrote:
> Hi,
>
> On Thu, 16 Jun 2011, Richard Guenther wrote:
>
> > > If people want to not create useless conversions in the first place,
> > > though, I suspect there are lots of places that create useless
> > > conversions in the compiler.
> >
> > Yeah, the above looks it comes from the frontends - gimplification
> > should strip this conversion, if it doesn't that is a bug ;)
>
> Well, Mike said this view_convert_expr actually is on the LHS of an
> assignment. I wouldn't be surprised if nobody strips "useless"
> conversions of LHSes, exactly because such things on a LHS are no
> conversions.
For vectors we can move them to the rhs instead.
Richard.