Add pointer vectors: SimdConst, SimdMut

Author: workingjubilee

crates/core_simd/src/vector.rs

@@ -5,3 +5,6 @@ mod uint;
 pub use float::*;
 pub use int::*;
 pub use uint::*;
+
+// Vectors of pointers are not for public use at the current time.
+pub(crate) mod ptr;

crates/core_simd/src/vector/ptr.rs

@@ -0,0 +1,55 @@
+//! Private implementation details of public gather/scatter APIs.
+use crate::SimdUsize;
+use core::mem;
+
+/// A vector of *const T.
+#[derive(Debug, Copy, Clone)]
+#[repr(simd)]
+pub(crate) struct SimdConst<T, const LANES: usize>([*const T; LANES]);
+
+impl<T, const LANES: usize> SimdConst<T, LANES>
+where
+    SimdUsize<LANES>: crate::LanesAtMost32,
+    T: Sized,
+{
+    #[inline]
+    #[must_use]
+    pub fn splat(ptr: *const T) -> Self {
+        Self([ptr; LANES])
+    }
+
+    #[inline]
+    #[must_use]
+    pub fn wrapping_add(self, addend: SimdUsize<LANES>) -> Self {
+        unsafe {
+            let x: SimdUsize<LANES> = mem::transmute_copy(&self);
+            mem::transmute_copy(&{ x + (addend * mem::size_of::<T>()) })
+        }
+    }
+}
+
+/// A vector of *mut T. Be very careful around potential aliasing.
+#[derive(Debug, Copy, Clone)]
+#[repr(simd)]
+pub(crate) struct SimdMut<T, const LANES: usize>([*mut T; LANES]);
+
+impl<T, const LANES: usize> SimdMut<T, LANES>
+where
+    SimdUsize<LANES>: crate::LanesAtMost32,
+    T: Sized,
+{
+    #[inline]
+    #[must_use]
+    pub fn splat(ptr: *mut T) -> Self {
+        Self([ptr; LANES])
+    }
+
+    #[inline]
+    #[must_use]
+    pub fn wrapping_add(self, addend: SimdUsize<LANES>) -> Self {
+        unsafe {
+            let x: SimdUsize<LANES> = mem::transmute_copy(&self);
+            mem::transmute_copy(&{ x + (addend * mem::size_of::<T>()) })
+        }
+    }
+}