[turbofan] support for Int64 in CheckedLoad/CheckedStore on 64-bit platforms.

test/cctest/compiler/test-run-machops.cc

Index: test/cctest/compiler/test-run-machops.cc
diff --git a/test/cctest/compiler/test-run-machops.cc b/test/cctest/compiler/test-run-machops.cc
index 8b14dab46c4544105c4c581c38c2fa9f5b8b33f6..2206181f19013cb6d288a84dc866a553e1d506f3 100644
--- a/test/cctest/compiler/test-run-machops.cc
+++ b/test/cctest/compiler/test-run-machops.cc
@@ -5277,5 +5277,49 @@ TEST(RunCallCFunction8) {
     CHECK_EQ(x * 8, m.Call(x));
   }
 }
-
 #endif  // USE_SIMULATOR
+
+#if V8_TARGET_ARCH_64_BIT
+TEST(RunCheckedLoadInt64) {
+  int64_t buffer[] = {0x66bbccddeeff0011LL, 0x1122334455667788LL};
+  RawMachineAssemblerTester<int64_t> m(kMachInt32);
+  Node* base = m.PointerConstant(buffer);
+  Node* index = m.Parameter(0);
+  Node* length = m.Int32Constant(16);
+  Node* load =
+      m.NewNode(m.machine()->CheckedLoad(kMachInt64), base, index, length);
+  m.Return(load);
+
+  CHECK_EQ(buffer[0], m.Call(0));
+  CHECK_EQ(buffer[1], m.Call(8));
+  CHECK_EQ(0, m.Call(16));
+}
+
+
+TEST(RunCheckedStoreInt64) {
+  const int64_t write = 0x5566778899aabbLL;
+  const int64_t before = 0x33bbccddeeff0011LL;
+  int64_t buffer[] = {before, before};
+  RawMachineAssemblerTester<int32_t> m(kMachInt32);
+  Node* base = m.PointerConstant(buffer);
+  Node* index = m.Parameter(0);
+  Node* length = m.Int32Constant(16);
+  Node* value = m.Int64Constant(write);
+  Node* store = m.NewNode(m.machine()->CheckedStore(kMachInt64), base, index,
+                          length, value);
+  USE(store);
+  m.Return(m.Int32Constant(11));
+
+  CHECK_EQ(11, m.Call(16));
+  CHECK_EQ(before, buffer[0]);
+  CHECK_EQ(before, buffer[1]);
+
+  CHECK_EQ(11, m.Call(0));
+  CHECK_EQ(write, buffer[0]);
+  CHECK_EQ(before, buffer[1]);
+
+  CHECK_EQ(11, m.Call(8));
+  CHECK_EQ(write, buffer[0]);
+  CHECK_EQ(write, buffer[1]);
+}
+#endif