GCC trunk SPEC2000 performance

[law@redhat.com]

In message <3D125DB3.F3B600B5@moene.indiv.nluug.nl>, Toon Moene writes:
 > Richard Henderson wrote:
 > 
 > > On Fri, Jun 21, 2002 at 12:02:00AM +0200, Toon Moene wrote:
 > > > So, OK - that's it.  Addressof makes a MEM out of this register, so we
 > > > should accept it down the road.
 > 
 > > Alternately, we may want to remove it from the reg_rtx array.
 > 
 > Well, that would make this code a lot clearer for unsuspecting onlookers
 > like me :-)
Or even for suspecting folks ;-)

I think all we'd need to do is clear the entry in the 4 places where we modify
REGs in-place and turn them into MEMs.  3 are in function.c plus one in reload.

There's the possibility we have code which walks the entries in the reg array
and isn't prepared for an entry that has been wiped away.  So we should go
through the usual testing procedures for such a change.

jeff