------- Comment #73 from bernds at codesourcery dot com 2010-08-06 10:27
-------
Subject: Re: [4.6 regression] Revision 162270 failed
to bootstrap
On 08/06/2010 12:00 PM, bonzini at gnu dot org wrote:
> ------- Comment #72 from bonzini at gnu dot org 2010-08-06 10:00 -------
> No, why is there no def for r25 _where it is clobbered_?
There is. The problem seems to be that we first propagate into insn 15,
which then looks like
(insn 15 14 16 3 (set (reg:DI 67 [ obj.8+-4 ])
(sign_extend:DI (reg:SI 25 %r25 [ obj ])))
../../gcc/gcc/cfg.c:1211 139 {extendsidi2}
(expr_list:REG_DEAD (reg/v:DI 74 [ obj+-4 ])
(nil)))
and from there, we propagate into another insn. However, at this point,
insn 15 has no uses associated with it, so all_uses_available_at returns
true without doing anything.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44970
