1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/wasm/regress/unaligned-store64.js b/js/src/jit-test/tests/wasm/regress/unaligned-store64.js
new file mode 100644
index 0000000000..b878093451
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/regress/unaligned-store64.js
@@ -0,0 +1,35 @@
+var ins = new WebAssembly.Instance(new WebAssembly.Module(wasmTextToBinary(
+    `(module
+       (memory (export "mem") 1 1)
+       (func (export "store_32_1") (param $ptr i32)
+         (i64.store32 align=1 (local.get $ptr) (i64.const 0xabba1337)))
+       (func (export "store_32_2") (param $ptr i32)
+         (i64.store32 align=2 (local.get $ptr) (i64.const 0xabba1337)))
+       (func (export "store_16") (param $ptr i32)
+         (i64.store16 align=1 (local.get $ptr) (i64.const 0x1337))))`))).exports;
+
+var mem = new Uint8Array(ins.mem.buffer);
+
+ins.store_16(1);
+assertEq(mem[1], 0x37);
+assertEq(mem[2], 0x13);
+
+ins.store_32_1(11);
+assertEq(mem[11], 0x37);
+assertEq(mem[12], 0x13);
+assertEq(mem[13], 0xba);
+assertEq(mem[14], 0xab);
+
+ins.store_32_2(18);
+assertEq(mem[18], 0x37);
+assertEq(mem[19], 0x13);
+assertEq(mem[20], 0xba);
+assertEq(mem[21], 0xab);
+
+// This must also work on all platforms even though we're lying about the
+// alignment.
+ins.store_32_2(29);
+assertEq(mem[29], 0x37);
+assertEq(mem[30], 0x13);
+assertEq(mem[31], 0xba);
+assertEq(mem[32], 0xab);