https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110643
--- Comment #15 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Well the cvise reduced testcase is undefined code:
template <int __i, typename... _Elements>
__tuple_element_t<__i, tuple<_Elements...>> get(tuple<_Elements...>) {
double __trans_tmp_23{};
double *__trans_tmp_21 = &__trans_tmp_23;
return __trans_tmp_21;
}
That returns a address to a local variable ...
Which is why you get this warning:
```
<source>: In function 'void hwy::AssertVecEqual(Vec<Simd<double> >)':
<source>:174:45: warning: '__trans_tmp_23' is used uninitialized
[-Wuninitialized]
174 | __trans_tmp_20 = *actual_lanes.get();
| ^
<source>:42:10: note: '__trans_tmp_23' was declared here
42 | double __trans_tmp_23{};
| ^~~~~~~~~~~~~~
```
