1 files changed, 30 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/wasm/atomics.js b/deps/v8/test/mjsunit/wasm/atomics.js
index 58d3d950d5..371839ae24 100644
--- a/deps/v8/test/mjsunit/wasm/atomics.js
+++ b/deps/v8/test/mjsunit/wasm/atomics.js
@@ -432,3 +432,33 @@ function TestStore(func, buffer, value, size) {
   assertThrows(() => GetAtomicBinOpFunction(kExprI32AtomicSub16U, 3, 0),
       WebAssembly.CompileError);
 })();
+
+function CmpExchgLoop(opcode, alignment) {
+  print("TestI64AtomicCompareExchangeLoop" + alignment);
+  let builder = new WasmModuleBuilder();
+  builder.addImportedMemory("m", "imported_mem", 0, 2, "shared");
+  builder.addFunction("main", makeSig([kWasmI32], []))
+      .addLocals({i64_count: 2})
+      .addBody([
+        kExprLoop, kWasmStmt,
+          kExprGetLocal, 0,
+          kExprGetLocal, 1,
+          kExprGetLocal, 2,
+          kAtomicPrefix, opcode, alignment, 0,
+          kExprGetLocal, 1,
+          kExprI64Ne,
+          kExprBrIf, 0,
+          kExprEnd
+      ])
+      .exportFunc();
+  let mem = new WebAssembly.Memory({initial: 2, maximum: 2, shared: true});
+  let module = new WebAssembly.Module(builder.toBuffer());
+  let instance = new WebAssembly.Instance(module, {m: {imported_mem: mem}});
+}
+
+(function TestAtomicCompareExchgLoop() {
+  CmpExchgLoop(kExprI64AtomicCompareExchange, 3);
+  CmpExchgLoop(kExprI64AtomicCompareExchange32U, 2);
+  CmpExchgLoop(kExprI64AtomicCompareExchange16U, 1);
+  CmpExchgLoop(kExprI64AtomicCompareExchange8U, 0);
+})();