https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87680
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
I believe this bug (and other existing dups) are about the C++ FE for array
initializers not emitting a loop for initialization but an initializer for each
element. It does that via
;; Function constexpr Bar::Bar() (null)
;; enabled by -tree-original
{
<<cleanup_point <<< Unknown tree: expr_stmt
(void) (((struct Bar *) this)->foo = <<< Unknown tree: vec_init_expr
D.2381
>>>) >>>>>;
}
which eventually is gimplified to
Bar::Bar (struct Bar * const this)
{
this->foo[0].a = 10;
this->foo[0].b = 11;
this->foo[0].c = 12;
this->foo[0].d = 13;
this->foo[1].a = 10;
this->foo[1].b = 11;
...
via cp_gimplify_expr.
