[Bug middle-end/57192] [4.9 Regression] miscompilation at -O3

[Joost.VandeVondele at mat dot ethz.ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57192

--- Comment #12 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> 2013-05-08 13:03:59 UTC ---
Reduced testcase that still triggers the valgrind warning during compilation:

MODULE orbital_pointers
  INTEGER, DIMENSION(:,:), ALLOCATABLE   :: soset
CONTAINS
  SUBROUTINE create_orbital_pointers(maxl)
    soset(:,:) = 0
  END SUBROUTINE create_orbital_pointers
END MODULE orbital_pointers

gfortran -O3 

==81795== Conditional jump or move depends on uninitialised value(s)
==81795==    at 0xDF5DAB: register_active_defs(df_ref_d**) (sparseset.h:147)
==81795==    by 0xDF5E52: update_df_init(rtx_def*, rtx_def*) [clone .isra.11]
(fwprop.c:894)
==81795==    by 0xDF65F1: try_fwprop_subst(df_ref_d*, rtx_def**, rtx_def*,
rtx_def*, bool) (fwprop.c:962)
==81795==    by 0xDF6A91: forward_propagate_into(df_ref_d*) (fwprop.c:1342)
==81795==    by 0xDF7B27: fwprop() (fwprop.c:1479)
==81795==    by 0x9021DF: execute_one_pass(opt_pass*) (passes.c:2337)
==81795==    by 0x902644: execute_pass_list(opt_pass*) (passes.c:2389)
==81795==    by 0x902656: execute_pass_list(opt_pass*) (passes.c:2390)
==81795==    by 0x6CC857: expand_function(cgraph_node*) (cgraphunit.c:1640)
==81795==    by 0x6CE5FC: compile() (cgraphunit.c:1744)
==81795==    by 0x6CEC94: finalize_compilation_unit() (cgraphunit.c:2119)
==81795==    by 0x8992FA: write_global_declarations() (langhooks.c:322)