1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/regress/bug1747870.js b/js/src/jit-test/tests/wasm/regress/bug1747870.js
new file mode 100644
index 0000000000..2625e965fb
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/regress/bug1747870.js
@@ -0,0 +1,19 @@
+// |jit-test| skip-if: !wasmSimdEnabled()
+
+// This should not release-assert, which it could previously do on some 32-bit
+// platforms due to the too-limited size of a bitfield.
+
+const MaxParams = 1000;         // Per spec
+
+var params = '';
+for ( var i=0 ; i < MaxParams-1; i++ ) {
+    params += '(param v128) '
+}
+params += '(param externref)'
+
+new WebAssembly.Module(wasmTextToBinary(`
+(module
+  (func $f)
+  (func ${params} (result externref)
+    (call $f)
+    (local.get ${MaxParams-1})))`));