[Bug tree-optimization/34099] [4.3 Regression] optimizer problem

[rguenth at gcc dot gnu dot org]

------- Comment #9 from rguenth at gcc dot gnu dot org  2007-11-15 16:06 -------
Created an attachment (id=14557)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14557&action=view)
broken patch

It miscompiles gengtype.  I remember problems with changing likely_value in
similar ways back in time.  The other option is to not ignore UNDEFINED lattice
values in ccp_lattice_meet but do

                any  M UNDEFINED   = VARYING

instead of

                any  M UNDEFINED   = any


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34099