8 files changed, 135 insertions, 18 deletions
diff --git a/src/test/ui/error-codes/E0439.rs b/src/test/ui/error-codes/E0439.rs
deleted file mode 100644
index 86e9cb55a9c..00000000000
--- a/src/test/ui/error-codes/E0439.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-#![feature(platform_intrinsics)]
-
-extern "platform-intrinsic" {
-    fn simd_shuffle<A,B>(a: A, b: A, c: [u32; 8]) -> B; //~ ERROR E0439
-}
-
-fn main () {
-}
diff --git a/src/test/ui/error-codes/E0439.stderr b/src/test/ui/error-codes/E0439.stderr
deleted file mode 100644
index 8021f7d3951..00000000000
--- a/src/test/ui/error-codes/E0439.stderr
+++ /dev/null
@@ -1,9 +0,0 @@
-error[E0439]: invalid `simd_shuffle`, needs length: `simd_shuffle`
-  --> $DIR/E0439.rs:4:5
-   |
-LL |     fn simd_shuffle<A,B>(a: A, b: A, c: [u32; 8]) -> B;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to previous error
-
-For more information about this error, try `rustc --explain E0439`.
diff --git a/src/test/ui/simd-intrinsic/simd-intrinsic-generic-shuffle.rs b/src/test/ui/simd-intrinsic/simd-intrinsic-generic-shuffle.rs
new file mode 100644
index 00000000000..9611780ac07
--- /dev/null
+++ b/src/test/ui/simd-intrinsic/simd-intrinsic-generic-shuffle.rs
@@ -0,0 +1,33 @@
+// build-fail
+
+// Test that the simd_shuffle intrinsic produces ok-ish error
+// messages when misused.
+
+#![feature(repr_simd, platform_intrinsics)]
+
+#[repr(simd)]
+#[derive(Copy, Clone)]
+pub struct Simd<T, const N: usize>([T; N]);
+
+extern "platform-intrinsic" {
+    fn simd_shuffle<T, I, U>(a: T, b: T, i: I) -> U;
+}
+
+fn main() {
+    const I: [u32; 2] = [0; 2];
+    const I2: [f32; 2] = [0.; 2];
+    let v = Simd::<u32, 4>([0; 4]);
+
+    unsafe {
+        let _: Simd<u32, 2> = simd_shuffle(v, v, I);
+
+        let _: Simd<u32, 4> = simd_shuffle(v, v, I);
+        //~^ ERROR invalid monomorphization of `simd_shuffle` intrinsic
+
+        let _: Simd<f32, 2> = simd_shuffle(v, v, I);
+        //~^ ERROR invalid monomorphization of `simd_shuffle` intrinsic
+
+        let _: Simd<u32, 2> = simd_shuffle(v, v, I2);
+        //~^ ERROR invalid monomorphization of `simd_shuffle` intrinsic
+    }
+}
diff --git a/src/test/ui/simd-intrinsic/simd-intrinsic-generic-shuffle.stderr b/src/test/ui/simd-intrinsic/simd-intrinsic-generic-shuffle.stderr
new file mode 100644
index 00000000000..9eeb000fd26
--- /dev/null
+++ b/src/test/ui/simd-intrinsic/simd-intrinsic-generic-shuffle.stderr
@@ -0,0 +1,21 @@
+error[E0511]: invalid monomorphization of `simd_shuffle` intrinsic: expected return type of length 2, found `Simd<u32, 4_usize>` with length 4
+  --> $DIR/simd-intrinsic-generic-shuffle.rs:24:31
+   |
+LL |         let _: Simd<u32, 4> = simd_shuffle(v, v, I);
+   |                               ^^^^^^^^^^^^^^^^^^^^^
+
+error[E0511]: invalid monomorphization of `simd_shuffle` intrinsic: expected return element type `u32` (element of input `Simd<u32, 4_usize>`), found `Simd<f32, 2_usize>` with element type `f32`
+  --> $DIR/simd-intrinsic-generic-shuffle.rs:27:31
+   |
+LL |         let _: Simd<f32, 2> = simd_shuffle(v, v, I);
+   |                               ^^^^^^^^^^^^^^^^^^^^^
+
+error[E0511]: invalid monomorphization of `simd_shuffle` intrinsic: simd_shuffle index must be an array of `u32`, got `[f32; 2]`
+  --> $DIR/simd-intrinsic-generic-shuffle.rs:30:31
+   |
+LL |         let _: Simd<u32, 2> = simd_shuffle(v, v, I2);
+   |                               ^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0511`.
diff --git a/src/test/ui/simd/monomorphize-shuffle-index.rs b/src/test/ui/simd/monomorphize-shuffle-index.rs
new file mode 100644
index 00000000000..2467baa08b0
--- /dev/null
+++ b/src/test/ui/simd/monomorphize-shuffle-index.rs
@@ -0,0 +1,40 @@
+//run-pass
+#![feature(repr_simd, platform_intrinsics)]
+
+extern "platform-intrinsic" {
+    fn simd_shuffle<T, I, U>(a: T, b: T, i: I) -> U;
+}
+
+#[derive(Copy, Clone)]
+#[repr(simd)]
+struct Simd<T, const N: usize>([T; N]);
+
+trait Shuffle<const N: usize> {
+    const I: [u32; N];
+
+    unsafe fn shuffle<T, const M: usize>(&self, a: Simd<T, M>, b: Simd<T, M>) -> Simd<T, N> {
+        simd_shuffle(a, b, Self::I)
+    }
+}
+
+fn main() {
+    struct I1;
+    impl Shuffle<4> for I1 {
+        const I: [u32; 4] = [0, 2, 4, 6];
+    }
+
+    struct I2;
+    impl Shuffle<2> for I2 {
+        const I: [u32; 2] = [1, 5];
+    }
+
+    let a = Simd::<u8, 4>([0, 1, 2, 3]);
+    let b = Simd::<u8, 4>([4, 5, 6, 7]);
+    unsafe {
+        let x: Simd<u8, 4> = I1.shuffle(a, b);
+        assert_eq!(x.0, [0, 2, 4, 6]);
+
+        let y: Simd<u8, 2> = I2.shuffle(a, b);
+        assert_eq!(y.0, [1, 5]);
+    }
+}
diff --git a/src/test/ui/simd/shuffle-not-out-of-bounds.rs b/src/test/ui/simd/shuffle-not-out-of-bounds.rs
index 8a533453e75..aae6ce4663f 100644
--- a/src/test/ui/simd/shuffle-not-out-of-bounds.rs
+++ b/src/test/ui/simd/shuffle-not-out-of-bounds.rs
@@ -188,4 +188,14 @@ fn main() {
          48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33,
          32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17,
          16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1));
+
+    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
+    }
 }
diff --git a/src/test/ui/simd/shuffle-not-out-of-bounds.stderr b/src/test/ui/simd/shuffle-not-out-of-bounds.stderr
index 07253a4ae46..737fb5e6e51 100644
--- a/src/test/ui/simd/shuffle-not-out-of-bounds.stderr
+++ b/src/test/ui/simd/shuffle-not-out-of-bounds.stderr
@@ -71,6 +71,12 @@ LL | |          16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1));
    |
    = note: this error originates in the macro `test_shuffle_lanes` (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error: aborting due to 6 previous errors
+error[E0511]: invalid monomorphization of `simd_shuffle` intrinsic: shuffle index #0 is out of bounds (limit 4)
+  --> $DIR/shuffle-not-out-of-bounds.rs:198:23
+   |
+LL |         let _: u8x2 = simd_shuffle(v, v, I);
+   |                       ^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 7 previous errors
 
 For more information about this error, try `rustc --explain E0511`.
diff --git a/src/test/ui/simd/shuffle.rs b/src/test/ui/simd/shuffle.rs
new file mode 100644
index 00000000000..3592adfdc6a
--- /dev/null
+++ b/src/test/ui/simd/shuffle.rs
@@ -0,0 +1,24 @@
+//run-pass
+#![feature(repr_simd, platform_intrinsics)]
+
+extern "platform-intrinsic" {
+    fn simd_shuffle<T, I, U>(a: T, b: T, i: I) -> U;
+}
+
+#[derive(Copy, Clone)]
+#[repr(simd)]
+struct Simd<T, const N: usize>([T; N]);
+
+fn main() {
+    const I1: [u32; 4] = [0, 2, 4, 6];
+    const I2: [u32; 2] = [1, 5];
+    let a = Simd::<u8, 4>([0, 1, 2, 3]);
+    let b = Simd::<u8, 4>([4, 5, 6, 7]);
+    unsafe {
+        let x: Simd<u8, 4> = simd_shuffle(a, b, I1);
+        assert_eq!(x.0, [0, 2, 4, 6]);
+
+        let y: Simd<u8, 2> = simd_shuffle(a, b, I2);
+        assert_eq!(y.0, [1, 5]);
+    }
+}