Add tests

Author: bjorn3

src/tools/miri/tests/pass/shims/aarch64/intrinsics-aarch64-neon.rs

@@ -0,0 +1,40 @@
+// We're testing aarch64 target specific features
+//@only-target: aarch64
+//@compile-flags: -C target-feature=+neon
+
+use std::arch::aarch64::*;
+use std::arch::is_aarch64_feature_detected;
+
+fn main() {
+    assert!(is_aarch64_feature_detected!("neon"));
+
+    unsafe {
+        test_neon();
+    }
+}
+
+#[target_feature(enable = "neon")]
+unsafe fn test_neon() {
+    // Adapted from library/stdarch/crates/core_arch/src/aarch64/neon/mod.rs
+    unsafe fn test_vpmaxq_u8() {
+        let a = vld1q_u8([1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8].as_ptr());
+        let b = vld1q_u8([0, 3, 2, 5, 4, 7, 6, 9, 0, 3, 2, 5, 4, 7, 6, 9].as_ptr());
+        let e = [2, 4, 6, 8, 2, 4, 6, 8, 3, 5, 7, 9, 3, 5, 7, 9];
+        let mut r = [0; 16];
+        vst1q_u8(r.as_mut_ptr(), vpmaxq_u8(a, b));
+        assert_eq!(r, e);
+    }
+    test_vpmaxq_u8();
+
+    unsafe fn test_vpmaxq_u8_is_unsigned() {
+        let a = vld1q_u8(
+            [255, 0, 253, 252, 251, 250, 249, 248, 255, 254, 253, 252, 251, 250, 249, 248].as_ptr(),
+        );
+        let b = vld1q_u8([254, 3, 2, 5, 4, 7, 6, 9, 0, 3, 2, 5, 4, 7, 6, 9].as_ptr());
+        let e = [255, 253, 251, 249, 255, 253, 251, 249, 254, 5, 7, 9, 3, 5, 7, 9];
+        let mut r = [0; 16];
+        vst1q_u8(r.as_mut_ptr(), vpmaxq_u8(a, b));
+        assert_eq!(r, e);
+    }
+    test_vpmaxq_u8_is_unsigned();
+}