some tree-ssa vs mainline stats

[law@redhat.com]

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.  

Jeff