http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55419
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-11-21
11:18:22 UTC ---
/* We always set TREE_SIDE_EFFECTS so that expand_expr does not
ignore the TARGET_EXPR. If there really turn out to be no
side-effects, then the optimizer should be able to get rid of
whatever code is generated anyhow. */
TREE_SIDE_EFFECTS (t) = 1;
+ if (literal_type_p (type))
+ TREE_CONSTANT (t) = TREE_CONSTANT (value);
So we end up with TARGET_EXPR with TREE_SIDE_EFFECTS, but TREE_CONSTANT set
too, which is what the gimplifier is complaining about. constants shouldn't
have side-effects. If this is some trick internal to the C++ FE, then at least
the genericizer should drop TREE_CONSTANT from TARGET_EXPRs with
TREE_SIDE_EFFECTS set that are passed down to the middle-end.
