1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/regress/bug1836708.js b/js/src/jit-test/tests/wasm/regress/bug1836708.js
new file mode 100644
index 0000000000..87b7483bd6
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/regress/bug1836708.js
@@ -0,0 +1,19 @@
+// Testing i64.mul in wasm with a 2 ** n +- 1 value as operand, which may
+// be optimized in code generation.
+var mulImmOperands = [];
+
+for (let i = 0n; i < 64n; i++) {
+  mulImmOperands.push(2n ** i - 1n);
+  mulImmOperands.push(2n ** i + 1n);
+}
+
+for (const immVal of mulImmOperands) {
+  const ins = wasmEvalText(`(module
+    (func (export "mul_i64") (param i64) (result i64)
+      local.get 0
+      i64.const ${immVal}
+      i64.mul
+    ))`);
+
+  assertEq(ins.exports.mul_i64(42n), BigInt.asIntN(64, 42n * immVal));
+}