1 files changed, 87 insertions, 0 deletions
diff --git a/src/test/ui/simd/shuffle-not-out-of-bounds.rs b/src/test/ui/simd/shuffle-not-out-of-bounds.rs
new file mode 100644
index 000000000..0dee3a0e8
--- /dev/null
+++ b/src/test/ui/simd/shuffle-not-out-of-bounds.rs
@@ -0,0 +1,87 @@
+// build-fail
+#![allow(non_camel_case_types)]
+#![feature(repr_simd, platform_intrinsics)]
+
+// Test for #73542 to verify out-of-bounds shuffle vectors do not compile.
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+struct u8x2([u8; 2]);
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+struct u8x4([u8; 4]);
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+struct u8x8([u8; 8]);
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+struct u8x16([u8; 16]);
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+struct u8x32([u8; 32]);
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+struct u8x64([u8; 64]);
+
+extern "platform-intrinsic" {
+    pub fn simd_shuffle2<T, U>(x: T, y: T, idx: [u32; 2]) -> U;
+    pub fn simd_shuffle4<T, U>(x: T, y: T, idx: [u32; 4]) -> U;
+    pub fn simd_shuffle8<T, U>(x: T, y: T, idx: [u32; 8]) -> U;
+    pub fn simd_shuffle16<T, U>(x: T, y: T, idx: [u32; 16]) -> U;
+    pub fn simd_shuffle32<T, U>(x: T, y: T, idx: [u32; 32]) -> U;
+    pub fn simd_shuffle64<T, U>(x: T, y: T, idx: [u32; 64]) -> U;
+}
+
+// Test vectors by lane size. Since LLVM does not distinguish between a shuffle
+// over two f32s and a shuffle over two u64s, or any other such combination,
+// it is not necessary to test every possible vector, only lane counts.
+macro_rules! test_shuffle_lanes {
+    ($n:literal, $x:ident, $y:ident) => {
+        unsafe {
+                let shuffle: $x = {
+                    const ARR: [u32; $n] = {
+                        let mut arr = [0; $n];
+                        arr[0] = $n * 2;
+                        arr
+                    };
+                    let mut n: u8 = $n;
+                    let vals = [0; $n].map(|_| { n = n - 1; n });
+                    let vec1 = $x(vals);
+                    let vec2 = $x(vals);
+                    $y(vec1, vec2, ARR)
+                };
+        }
+    }
+}
+//~^^^^^ ERROR: invalid monomorphization of `simd_shuffle2` intrinsic
+//~| ERROR: invalid monomorphization of `simd_shuffle4` intrinsic
+//~| ERROR: invalid monomorphization of `simd_shuffle8` intrinsic
+//~| ERROR: invalid monomorphization of `simd_shuffle16` intrinsic
+//~| ERROR: invalid monomorphization of `simd_shuffle32` intrinsic
+//~| ERROR: invalid monomorphization of `simd_shuffle64` intrinsic
+// Because the test is mostly embedded in a macro, all the errors have the same origin point.
+// And unfortunately, standard comments, as in the UI test harness, disappear in macros!
+
+fn main() {
+    test_shuffle_lanes!(2, u8x2, simd_shuffle2);
+    test_shuffle_lanes!(4, u8x4, simd_shuffle4);
+    test_shuffle_lanes!(8, u8x8, simd_shuffle8);
+    test_shuffle_lanes!(16, u8x16, simd_shuffle16);
+    test_shuffle_lanes!(32, u8x32, simd_shuffle32);
+    test_shuffle_lanes!(64, u8x64, simd_shuffle64);
+
+    extern "platform-intrinsic" {
+        fn simd_shuffle<T, I, U>(a: T, b: T, i: I) -> U;
+    }
+    let v = u8x2([0, 0]);
+    const I: [u32; 2] = [4, 4];
+    unsafe {
+        let _: u8x2 = simd_shuffle(v, v, I);
+        //~^ ERROR invalid monomorphization of `simd_shuffle` intrinsic
+    }
+}