------- Comment #11 from dje at gcc dot gnu dot org 2006-08-24 18:19 -------
Created an attachment (id=12128)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12128&action=view)
allow immediate load into CRs
Ulrich Weigand pointed out the instruction that is failing is a secondary
reload already. Reload fundamentally does not check predicates, so that is a
red herring.
The bug is an omission in the movcc_internal1 pattern. The secondary reload is
trying to load an immediate into a GPR, but the pattern does not provide any
alternative for immediate constants. Although PPC CRs themselves generally
cannot materialize an immediate constant, a GPR in CC mode loading a constant
must be described by the pattern, which it was not.
PPC CRs can materialize two constants easily: all zeros and all ones. The
particular case in this bug is (const_int 0) and that will be more common, so I
also added an alternative to materialize that directly without the secondary
reload.
--
dje at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #12118|0 |1
is obsolete| |
AssignedTo|unassigned at gcc dot gnu |dje at gcc dot gnu dot org
|dot org |
Status|NEW |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28753
