------- Comment #2 from dberlin at gcc dot gnu dot org 2009-01-04 22:35 -------
Subject: Re: New: default definitions not in avail_out
At one time we pretended they were defined in the entry block, and
IIRC, it worked out okay.
Dunno what happened to this :)
On Sun, Jan 4, 2009 at 1:40 PM, rguenth at gcc dot gnu dot org
<gcc-bugzi...@gcc.gnu.org> wrote:
> FRE does not optimize
>
> int i;
> int foo (void)
> {
> int j;
> i = j;
> return i;
> }
>
> because j_1(D) is never in AVAIL_OUT, so we do not find a leader for it.
>
> We can fix this by either pretending used default definitions are defined
> in the entry block or by treating default definitions the same as constants
> during elimination.
>
> Danny?
>
>
> --
> Summary: default definitions not in avail_out
> Product: gcc
> Version: 4.4.0
> Status: UNCONFIRMED
> Keywords: missed-optimization
> Severity: enhancement
> Priority: P3
> Component: tree-optimization
> AssignedTo: unassigned at gcc dot gnu dot org
> ReportedBy: rguenth at gcc dot gnu dot org
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38723
>
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--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38723
