Auto merge of #1366 - gnzlbg:vec, r=emiliov0.38.0

Map vector types to arrays and pass them by value

This PR maps vector types to arrays and passes them by value (that is, they are passed to C as `[T; N]`.  This already allows defining them as a blacklisted opaque type, such that the user can provide its own definition from e.g. `std::arch`.

A subsequent PR should map vector types to unit structs with a private member:

```rust
#[repr(align(16))] pub struct __m128([f32; 4]);
```

to make their alignment at least be correct. This should allow transmuting `std::arch` types to these types properly.

Once that is done, we probably want to detect the canonical vector types (e.g. `__m128`) and pull in the type from `std`/`core`::arch instead.

2 files changed, 19 insertions, 3 deletions

diff --git a/tests/expectations/tests/vector.rs b/tests/expectations/tests/vector.rs
index 357b9ef4..86a9d737 100644
--- a/tests/expectations/tests/vector.rs
+++ b/tests/expectations/tests/vector.rs
@@ -1,8 +1,11 @@
 /* automatically generated by rust-bindgen */
 
-
-#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
-
+#![allow(
+    dead_code,
+    non_snake_case,
+    non_camel_case_types,
+    non_upper_case_globals
+)]
 
 #[repr(C)]
 #[derive(Debug, Default, Copy, Clone)]
@@ -32,3 +35,10 @@ fn bindgen_test_layout_foo() {
         )
     );
 }
+pub type __m128 = [f32; 4usize];
+pub type __m128d = [f64; 2usize];
+pub type __m128i = [::std::os::raw::c_longlong; 2usize];
+extern "C" {
+    #[link_name = "\u{1}_Z3fooDv2_xDv2_d"]
+    pub fn foo(arg1: __m128i, arg2: __m128d) -> __m128;
+}
diff --git a/tests/headers/vector.hpp b/tests/headers/vector.hpp
index 4707f77f..173aa022 100644
--- a/tests/headers/vector.hpp
+++ b/tests/headers/vector.hpp
@@ -1,3 +1,9 @@
 struct foo {
   __attribute__((__vector_size__(1 * sizeof(long long)))) long long mMember;
 };
+
+typedef float __m128 __attribute__ ((__vector_size__ (16)));
+typedef double __m128d __attribute__((__vector_size__(16)));
+typedef long long __m128i __attribute__((__vector_size__(16)));
+
+__m128 foo(__m128i, __m128d);