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.

1 files changed, 6 insertions, 0 deletions

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);