[PATCH] D107900: Add a new clang-tidy check for trivially copyable types passed by const reference

[Arthur O'Dwyer via Phabricator via cfe-commits]

Quuxplusone added inline comments.


================
Comment at: clang-tools-extra/docs/clang-tidy/checks/misc-pod-const-ref-to-value.rst:21
+
+   If set to `true`, this check will limit itself to the `builtinType()` types. Default is `false`.
----------------
D107873 is related.

I'd like to see some tests/discussion around large types, e.g.
```
struct Widget { int a[1000]; };
void f(const Widget&);
```
(I think D107873 at least makes a conscious attempt to get the "would it be passed in registers?" check right.)

I'd like to see some tests/discussion around generic code, e.g.
```
template<class T>
struct Max {
    static T max(const T& a, const T& b);
};
int x = Max<int>::max(1, 2);  // passes `int` by const reference, but this is fine
```


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D107900/new/

https://reviews.llvm.org/D107900