[Bug tree-optimization/47391] [4.5/4.6 Regression] read from const volatile incorrectly eliminated

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47391

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-01-21 
09:29:46 UTC ---
setup_one_parameter too, on the other side
tree_add_const_value_attribute_for_decl, set_mem_attributes_minus_bitpos and
get_callee_fndecl test TREE_READONLY && !TREE_THIS_VOLATILE.