Add intrinsics

Author: calebzulawski

crates/core_simd/src/intrinsics.rs

@@ -67,4 +67,15 @@ extern "platform-intrinsic" {
 
     // {s,u}sub.sat
     pub(crate) fn simd_saturating_sub<T>(x: T, y: T) -> T;
+
+    // reductions
+    pub(crate) fn simd_reduce_add_ordered<T, U>(x: T, y: U) -> U;
+    pub(crate) fn simd_reduce_mul_ordered<T, U>(x: T, y: U) -> U;
+    pub(crate) fn simd_reduce_all<T>(x: T) -> bool;
+    pub(crate) fn simd_reduce_any<T>(x: T) -> bool;
+    pub(crate) fn simd_reduce_max<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_min<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_and<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_or<T, U>(x: T) -> U;
+    pub(crate) fn simd_reduce_xor<T, U>(x: T) -> U;
 }