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diff --git a/js/src/jit-test/tests/wasm/simd/js-api.js b/js/src/jit-test/tests/wasm/simd/js-api.js
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+++ b/js/src/jit-test/tests/wasm/simd/js-api.js
@@ -0,0 +1,130 @@
+// |jit-test| test-also=--no-threads; skip-if: !wasmSimdEnabled()
+
+// SIMD JS API
+//
+// As of 31 March 2020 the SIMD spec is very light on information about the JS
+// API, and what it has is ridden with misspellings, grammatical errors, and
+// apparent redundancies.  The rules below represent my best effort at
+// understanding the intent of the spec.  As far as I can tell, the rules for
+// v128 are intended to match the rules for i64 in the Wasm MVP.
+
+// Hopefully, these are enough to test that various JIT stubs are generated and
+// used if we run the tests in a loop.
+
+setJitCompilerOption("baseline.warmup.trigger", 2);
+setJitCompilerOption("ion.warmup.trigger", 4);
+
+// RULE: v128 cannot cross the JS/wasm boundary as a function parameter.
+//
+// A wasm function that:
+//  - takes or returns v128
+//  - was imported into wasm
+//  - is ultimately a JS function
+// should always throw TypeError when called from wasm.
+//
+// Note, JIT exit stubs should be generated here because settings above should
+// cause the JIT to tier up.
+
+var ins = wasmEvalText(`
+  (module
+    (import "m" "v128_param" (func $f (param v128)))
+    (import "m" "v128_return" (func $g (result v128)))
+    (func (export "v128_param")
+      (call $f (v128.const i32x4 0 0 0 0)))
+    (func (export "v128_result")
+      (drop (call $g))))`,
+                       {m:{v128_param: (x) => 0,
+                           v128_return: () => 0}});
+
+function call_v128_param() { ins.exports.v128_param(); }
+function call_v128_result() { ins.exports.v128_result(); }
+
+for ( let i = 0 ; i < 100; i++ ) {
+    assertErrorMessage(call_v128_param,
+                       TypeError,
+                       /cannot pass.*v128.*to or from JS/);
+    assertErrorMessage(call_v128_result,
+                       TypeError,
+                       /cannot pass.*v128.*to or from JS/);
+}
+
+// RULE: v128 cannot cross the JS/wasm boundary as a function parameter.
+//
+// A wasm function that:
+//  - takes or returns v128
+//  - is exported from wasm
+//  - is ultimately a true wasm function
+// should always throw TypeError when called from JS.
+//
+// Note, JIT entry stubs should be generated here because settings above should
+// cause the JIT to tier up.
+
+var ins2 = wasmEvalText(`
+  (module
+    (func (export "v128_param") (param v128) (result i32)
+      (i32.const 0))
+    (func (export "v128_result") (result v128)
+      (v128.const i32x4 0 0 0 0)))`);
+
+function call_v128_param2() { ins2.exports.v128_param(); }
+function call_v128_result2() { ins2.exports.v128_result(); }
+
+for ( let i = 0 ; i < 100; i++ ) {
+    assertErrorMessage(call_v128_param2,
+                       TypeError,
+                       /cannot pass.*v128.*to or from JS/);
+    assertErrorMessage(call_v128_result2,
+                       TypeError,
+                       /cannot pass.*v128.*to or from JS/);
+}
+
+// RULE: The rules about v128 passing into or out of a function apply even when
+// an imported JS function is re-exported and is then called.
+
+var newfn = (x) => x;
+var ins = wasmEvalText(`
+  (module
+    (import "m" "fn" (func $f (param v128) (result v128)))
+    (export "newfn" (func $f)))`,
+                                   {m:{fn: newfn}});
+assertErrorMessage(() => ins.exports.newfn(3),
+                   TypeError,
+                   /cannot pass.*v128.*to or from JS/);
+
+// RULE: WebAssembly.Global of type v128 is constructable from JS with a default
+// value.
+
+
+// RULE: WebAssembly.Global constructor for type v128 is not constructable with
+// or without a default value.
+
+assertErrorMessage(() => new WebAssembly.Global({value: "v128"}, 37),
+                   TypeError,
+                   /cannot pass.*v128.*to or from JS/);
+assertErrorMessage(() => new WebAssembly.Global({value: "v128"}),
+                   TypeError,
+                   /cannot pass.*v128.*to or from JS/);
+assertErrorMessage(() => new WebAssembly.Global({value: "v128", mutable: true}),
+                   TypeError,
+                   /cannot pass.*v128.*to or from JS/);
+
+// RULE: WebAssembly.Global of type v128 have getters and setters that throw
+// TypeError when called from JS.
+
+let {gi, gm} = wasmEvalText(`
+  (module
+    (global (export "gi") v128 v128.const i64x2 0 0)
+    (global (export "gm") (mut v128) v128.const i64x2 0 0)
+  )`).exports;
+
+assertErrorMessage(() => gi.value,
+                   TypeError,
+                   /cannot pass.*v128.*to or from JS/);
+assertErrorMessage(() => gi.valueOf(),
+                   TypeError,
+                   /cannot pass.*v128.*to or from JS/);
+assertErrorMessage(() => gm.value = 0,
+                   TypeError,
+                   /cannot pass.*v128.*to or from JS/);
+
+