Add 32-bit SIMD types i/u16x2 and i/u8x4. (rust-lang#145)

These types are useful for the "SIMD32" instructions available on ARMv6
(except M-class), ARMv7 (M-class with DSP), and ARMv8.

Author: adamgreig

crates/core_simd/src/vector/int.rs

@@ -136,6 +136,9 @@ pub type isizex4 = SimdIsize<4>;
 /// Vector of eight `isize` values
 pub type isizex8 = SimdIsize<8>;
 
+/// Vector of two `i16` values
+pub type i16x2 = SimdI16<2>;
+
 /// Vector of four `i16` values
 pub type i16x4 = SimdI16<4>;
 
@@ -169,6 +172,9 @@ pub type i64x4 = SimdI64<4>;
 /// Vector of eight `i64` values
 pub type i64x8 = SimdI64<8>;
 
+/// Vector of four `i8` values
+pub type i8x4 = SimdI8<4>;
+
 /// Vector of eight `i8` values
 pub type i8x8 = SimdI8<8>;
 

crates/core_simd/src/vector/uint.rs

@@ -105,6 +105,9 @@ pub type usizex4 = SimdUsize<4>;
 /// Vector of eight `usize` values
 pub type usizex8 = SimdUsize<8>;
 
+/// Vector of two `u16` values
+pub type u16x2 = SimdU16<2>;
+
 /// Vector of four `u16` values
 pub type u16x4 = SimdU16<4>;
 
@@ -138,6 +141,9 @@ pub type u64x4 = SimdU64<4>;
 /// Vector of eight `u64` values
 pub type u64x8 = SimdU64<8>;
 
+/// Vector of four `u8` values
+pub type u8x4 = SimdU8<4>;
+
 /// Vector of eight `u8` values
 pub type u8x8 = SimdU8<8>;