Add tests for masked loads&stores

Author: farnoy

crates/core_simd/tests/masked_load_store.rs

@@ -0,0 +1,35 @@
+#![feature(portable_simd)]
+use core_simd::simd::prelude::*;
+
+#[cfg(target_arch = "wasm32")]
+use wasm_bindgen_test::*;
+
+#[cfg(target_arch = "wasm32")]
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[test]
+#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
+fn masked_load_store() {
+    let mut arr = [u8::MAX; 7];
+
+    u8x4::splat(0).masked_store(&mut arr[5..], Mask::from_array([false, true, false, true]));
+    // write to index 8 is OOB and dropped
+    assert_eq!(arr, [255u8, 255, 255, 255, 255, 255, 0]);
+
+    u8x4::from_array([0, 1, 2, 3]).masked_store(&mut arr[1..], Mask::splat(true));
+    assert_eq!(arr, [255u8, 0, 1, 2, 3, 255, 0]);
+
+    // read from index 8 is OOB and dropped
+    assert_eq!(
+        u8x4::masked_load_or(&arr[4..], u8x4::splat(42)),
+        u8x4::from_array([3, 255, 0, 42])
+    );
+    assert_eq!(
+        u8x4::masked_load_select(
+            &arr[4..],
+            Mask::from_array([true, false, true, true]),
+            u8x4::splat(42)
+        ),
+        u8x4::from_array([3, 42, 0, 42])
+    );
+}