[tree-ssa] Patches

[law@redhat.com]

In message <1071756374.28985.32.camel@p4>, Andrew MacLeod writes:
 >On Thu, 2003-12-18 at 03:58, Zdenek Dvorak wrote:
 >> Hello,
 >> 
 >> could you please at least tell me whether someone intends to have a look
 >> at these patches (and if possible some estimate when), so that I may
 >> adjust my plans accordingly?
 >> 
 >> http://gcc.gnu.org/ml/gcc-patches/2003-12/msg00607.html
 >>   -- basic block merging
 >
 >I would prefer to see no reference to immediate_uses at all. Block's
 >should just not-merge if there are PHI nodes, so there doesn't need to
 >be an 'expensive' option.
Agreed.  Actually, there's a reasonable change Zdenek's code to kill the
useless PHI nodes exposed by optimizations will make this less of a 
restriction.  That code looks pretty close to being ready.

Fixing the various problems with the tag decls will also help since we'll
be able to DCE dead PHIs for memory tags.


jeff