some tree-ssa vs mainline stats

[Andrew MacLeod]

On Fri, 2003-06-20 at 15:52, law@redhat.com wrote:
> In message <1056137390.28175.8.camel@p4>, Andrew MacLeod writes:
>  >On Fri, 2003-06-20 at 10:32, law@redhat.com wrote:
>  >> 
>  >>  >
>  >>  >I don't suppose that the gimplifier knows when its done with a
>  >>  >temporary?  They aren't live past a stmt boundry are they? 
>  >> It doesn't know.  I don't think an are life past the original
>  >> statement boundary when we're done with gimplifying.  However
>  >> be aware that we have a formal temporary table now and try
>  >> to ensure that every time we evaluate a pure expression the
>  >> destination is the same formal temporary.
>  >> 
>  >But presumably, if nothing is live out a stmt, all the temporaries are
>  >available after every stmt, so the same ones ought to be available for
>  >the next stmt which is the same...
> Right, but I'm pretty sure that we don't want to start using the same
> formal temporary for different expressions.  
SSA will rename this them tho.... different versions.....

Andrew