------- Comment #4 from pinskia at gcc dot gnu dot org 2005-12-03 17:01 -------
This looks very much related to PR 21829.
Hmm, in 4.0.0 we got Before DOM (likewise for 4.1.0 and above):
<L1>:;
i_2 = i_10 + 1;
if (i_2 != 4) goto <L0>; else goto <L3>;
# i_7 = PHI <i_2(2)>;
<L3>:;
if (i_7 == 4) goto <L4>; else goto <L5>;
but after:
<L1>:;
i_2 = i_10 + 1;
if (i_2 != 4) goto <L0>; else goto <L3>;
Invalid sum of incoming frequencies 2375, should be 0
# i_7 = PHI <i_2(2)>;
<L3>:;
foo (r_3);
Which means that GCC got it right in 4.0.0
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
BugsThisDependsOn| |21829
Known to fail| |4.1.0 4.2.0
Known to work| |4.0.0 4.0.2
Summary|Jump threading opportunity |[4.1/4.2 Regression] Jump
|missed in tree-ssa but |threading opportunity missed
|caught in jump1 |in tree-ssa but caught in
| |jump1
Target Milestone|--- |4.2.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25243
