[Bug tree-optimization/54498] [4.6/4.7/4.8 Regression] incorrect code generation from g++ -O

2012-09-06 Thread rguenth at gcc dot gnu.org 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54498

--- Comment #7 from Richard Guenther  2012-09-06 
15:20:29 UTC ---
Author: rguenth
Date: Thu Sep  6 15:20:24 2012
New Revision: 191031

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191031
Log:
2012-09-06  Richard Guenther  

PR tree-optimization/54498
* tree-ssa-alias.h (get_continuation_for_phi): Add flag to
abort when reaching an already visited region.
* tree-ssa-alias.c (maybe_skip_until): Likewise.  And do it.
(get_continuation_for_phi_1): Likewise.
(walk_non_aliased_vuses): When we translated the reference,
abort when we re-visit a region.
* tree-ssa-pre.c (translate_vuse_through_block): Adjust.

Modified:
branches/gcc-4_7-branch/gcc/ChangeLog
branches/gcc-4_7-branch/gcc/tree-ssa-alias.c
branches/gcc-4_7-branch/gcc/tree-ssa-alias.h
branches/gcc-4_7-branch/gcc/tree-ssa-pre.c

[Bug tree-optimization/54498] [4.6/4.7/4.8 Regression] incorrect code generation from g++ -O

2012-09-06 Thread rguenth at gcc dot gnu.org 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54498

--- Comment #6 from Richard Guenther  2012-09-06 
14:47:50 UTC ---
Author: rguenth
Date: Thu Sep  6 14:47:42 2012
New Revision: 191030

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=191030
Log:
2012-09-06  Richard Guenther  

PR tree-optimization/54498
* tree-ssa-alias.h (get_continuation_for_phi): Add flag to
abort when reaching an already visited region.
* tree-ssa-alias.c (maybe_skip_until): Likewise.  And do it.
(get_continuation_for_phi_1): Likewise.
(walk_non_aliased_vuses): When we translated the reference,
abort when we re-visit a region.
* tree-ssa-pre.c (translate_vuse_through_block): Adjust.

Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-ssa-alias.c
trunk/gcc/tree-ssa-alias.h
trunk/gcc/tree-ssa-pre.c

[Bug tree-optimization/54498] [4.6/4.7/4.8 Regression] incorrect code generation from g++ -O

2012-09-06 Thread rguenth at gcc dot gnu.org 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54498

Richard Guenther  changed:

   What|Removed |Added

 Status|NEW |ASSIGNED
   Target Milestone|4.7.2   |4.6.4
Summary|[4.7/4.8 Regression]|[4.6/4.7/4.8 Regression]
   |incorrect code generation   |incorrect code generation
   |from g++ -O |from g++ -O

--- Comment #5 from Richard Guenther  2012-09-06 
13:54:34 UTC ---
Latent in 4.6, too.