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diff --git a/js/src/jit-test/tests/wasm/spec/relaxed-simd/i8x16_relaxed_swizzle.wast.js b/js/src/jit-test/tests/wasm/spec/relaxed-simd/i8x16_relaxed_swizzle.wast.js
new file mode 100644
index 0000000000..dd77c2b074
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/spec/relaxed-simd/i8x16_relaxed_swizzle.wast.js
@@ -0,0 +1,90 @@
+/* Copyright 2021 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// ./test/core/relaxed-simd/i8x16_relaxed_swizzle.wast
+
+// ./test/core/relaxed-simd/i8x16_relaxed_swizzle.wast:3
+let $0 = instantiate(`(module
+    (func (export "i8x16.relaxed_swizzle") (param v128 v128) (result v128) (i8x16.relaxed_swizzle (local.get 0) (local.get 1)))
+
+    (func (export "i8x16.relaxed_swizzle_cmp") (param v128 v128) (result v128)
+          (i8x16.eq
+            (i8x16.relaxed_swizzle (local.get 0) (local.get 1))
+            (i8x16.relaxed_swizzle (local.get 0) (local.get 1))))
+)`);
+
+// ./test/core/relaxed-simd/i8x16_relaxed_swizzle.wast:12
+assert_return(
+  () => invoke($0, `i8x16.relaxed_swizzle`, [
+    i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+    i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+  ]),
+  [
+    either(
+      i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+      i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+    ),
+  ],
+);
+
+// ./test/core/relaxed-simd/i8x16_relaxed_swizzle.wast:19
+assert_return(
+  () => invoke($0, `i8x16.relaxed_swizzle`, [
+    i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+    i8x16([0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f]),
+  ]),
+  [
+    either(
+      i8x16([0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0]),
+      i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+    ),
+  ],
+);
+
+// ./test/core/relaxed-simd/i8x16_relaxed_swizzle.wast:26
+assert_return(
+  () => invoke($0, `i8x16.relaxed_swizzle`, [
+    i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+    i8x16([0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff]),
+  ]),
+  [
+    either(
+      i8x16([0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0]),
+      i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+    ),
+  ],
+);
+
+// ./test/core/relaxed-simd/i8x16_relaxed_swizzle.wast:35
+assert_return(
+  () => invoke($0, `i8x16.relaxed_swizzle_cmp`, [
+    i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+    i8x16([0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f]),
+  ]),
+  [
+    i8x16([0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]),
+  ],
+);
+
+// ./test/core/relaxed-simd/i8x16_relaxed_swizzle.wast:41
+assert_return(
+  () => invoke($0, `i8x16.relaxed_swizzle_cmp`, [
+    i8x16([0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf]),
+    i8x16([0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff]),
+  ]),
+  [
+    i8x16([0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]),
+  ],
+);