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[Bug bootstrap/44970] [4.6 regression] Revision 162270 failed to bootstrap
- From: "bonzini at gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 6 Aug 2010 07:07:30 -0000
- Subject: [Bug bootstrap/44970] [4.6 regression] Revision 162270 failed to bootstrap
- References: <bug-44970-682@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #68 from bonzini at gnu dot org 2010-08-06 07:07 -------
fwprop.c doesn't handle it directly, but local_ref_killed_between_p should see
defs created by df-scan.c for each hard register in regs_invalidated_by_call
(see df_get_call_refs).
Also, since fwprop can lengthen lifetimes arbitrarily (though this wouldn't
happen often) propagate_rtx actually forbids copy propagation of hard
registers:
if (REG_P (new_rtx) && REGNO (new_rtx) < FIRST_PSEUDO_REGISTER)
return NULL_RTX;
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44970