Add simd_saturating_{add,sub} intrinsics

src/test/ui/simd-intrinsic/simd-intrinsic-generic-arithmetic-saturating.rs

@@ -0,0 +1,38 @@
+// ignore-emscripten
+// ignore-tidy-linelength
+#![feature(repr_simd, platform_intrinsics)]
+#![allow(non_camel_case_types)]
+#[repr(simd)]
+#[derive(Copy, Clone)]
+pub struct i32x4(pub i32, pub i32, pub i32, pub i32);
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+pub struct x4<T>(pub T, pub T, pub T, pub T);
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+pub struct f32x4(pub f32, pub f32, pub f32, pub f32);
+
+extern "platform-intrinsic" {
+    fn simd_saturating_add<T>(x: T, y: T) -> T;
+    fn simd_saturating_sub<T>(x: T, y: T) -> T;
+}
+
+fn main() {
+    let x = i32x4(0, 0, 0, 0);
+    let y = x4(0_usize, 0, 0, 0);
+    let z = f32x4(0.0, 0.0, 0.0, 0.0);
+
+    unsafe {
+        simd_saturating_add(x, x);
+        simd_saturating_add(y, y);
+        simd_saturating_sub(x, x);
+        simd_saturating_sub(y, y);
+
+        simd_saturating_add(z, z);
+        //~^ ERROR expected element type `f32` of vector type `f32x4` to be a signed or unsigned integer type
+        simd_saturating_sub(z, z);
+        //~^ ERROR expected element type `f32` of vector type `f32x4` to be a signed or unsigned integer type
+    }
+}

src/test/ui/simd-intrinsic/simd-intrinsic-generic-arithmetic-saturating.stderr

@@ -0,0 +1,15 @@
+error[E0511]: invalid monomorphization of `simd_saturating_add` intrinsic: expected element type `f32` of vector type `f32x4` to be a signed or unsigned integer type
+  --> $DIR/simd-intrinsic-generic-arithmetic-saturating.rs:33:9
+   |
+LL |         simd_saturating_add(z, z);
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0511]: invalid monomorphization of `simd_saturating_sub` intrinsic: expected element type `f32` of vector type `f32x4` to be a signed or unsigned integer type
+  --> $DIR/simd-intrinsic-generic-arithmetic-saturating.rs:35:9
+   |
+LL |         simd_saturating_sub(z, z);
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0511`.