[turbofan] Add the StackSlot operator to turbofan.

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

 // Copyright 2014 the V8 project authors. All rights reserved. Use of this
 // source code is governed by a BSD-style license that can be found in the
 // LICENSE file.
 
 #include <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/utils/random-number-generator.h"
@@ skipping 54 matching lines @@
   CHECK_EQ(7, m.Call(uint32_t(0xdfbec580)));
   CHECK_EQ(6, m.Call(uint32_t(0x27a9db40)));
   CHECK_EQ(5, m.Call(uint32_t(0xde3bcb20)));
   CHECK_EQ(4, m.Call(uint32_t(0xd7e8a610)));
   CHECK_EQ(3, m.Call(uint32_t(0x9afdbc88)));
   CHECK_EQ(2, m.Call(uint32_t(0x9afdbc84)));
   CHECK_EQ(1, m.Call(uint32_t(0x9afdbc82)));
   CHECK_EQ(0, m.Call(uint32_t(0x9afdbc81)));
 }
 
+TEST(RunStackSlot) {

[titzer, 2016/01/28 09:02:18]

Can you write another test that tries the same for all machine types?

[ahaas, 2016/01/28 14:55:44]

Done.

+  BufferedRawMachineAssemblerTester<double> m;
+
+  Node* slot1 = m.StackSlot(MachineRepresentation::kFloat64);
+  Node* slot2 = m.StackSlot(MachineRepresentation::kWord32);
+
+  m.Store(MachineRepresentation::kFloat64, slot1, m.Float64Constant(2143.64543),
+          WriteBarrierKind::kNoWriteBarrier);
+  m.Store(MachineRepresentation::kWord32, slot2, m.Int32Constant(2143),
+          WriteBarrierKind::kNoWriteBarrier);
+  m.Return(m.Load(MachineType::Float64(), slot1));
+
+  CHECK_EQ(2143.64543, m.Call());
+}
 
 TEST(RunWord32Clz) {
   BufferedRawMachineAssemblerTester<int32_t> m(MachineType::Uint32());
   m.Return(m.Word32Clz(m.Parameter(0)));
 
   CHECK_EQ(0, m.Call(uint32_t(0x80001000)));
   CHECK_EQ(1, m.Call(uint32_t(0x40000500)));
   CHECK_EQ(2, m.Call(uint32_t(0x20000300)));
   CHECK_EQ(3, m.Call(uint32_t(0x10000003)));
   CHECK_EQ(4, m.Call(uint32_t(0x08050000)));
@@ skipping 5998 matching lines @@
   Node* call = r.AddNode(r.common()->Call(desc), phi);
   r.Return(call);
 
   CHECK_EQ(33, r.Call(1));
   CHECK_EQ(44, r.Call(0));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8