MIPS64: [turbofan] Improve changes from and to Smi.

test/unittests/compiler/mips64/instruction-selector-mips64-unittest.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 "test/unittests/compiler/instruction-selector-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
@@ skipping 426 matching lines @@
   ASSERT_EQ(1U, s.size());
   EXPECT_EQ(conv.mi.arch_opcode, s[0]->arch_opcode());
   EXPECT_EQ(1U, s[0]->InputCount());
   EXPECT_EQ(1U, s[0]->OutputCount());
 }
 
 INSTANTIATE_TEST_CASE_P(InstructionSelectorTest,
                         InstructionSelectorConversionTest,
                         ::testing::ValuesIn(kConversionInstructions));
 
+TEST_F(InstructionSelectorTest, ChangesFromToSmi) {
+  {
+    StreamBuilder m(this, kMachInt32, kMachInt32);
+    m.Return(m.TruncateInt64ToInt32(
+        m.Word64Sar(m.Parameter(0), m.Int32Constant(32))));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMips64Dsar, s[0]->arch_opcode());
+    EXPECT_EQ(kMode_None, s[0]->addressing_mode());
+    ASSERT_EQ(2U, s[0]->InputCount());
+    EXPECT_EQ(1U, s[0]->OutputCount());
+  }
+  {
+    StreamBuilder m(this, kMachInt32, kMachInt32);
+    m.Return(
+        m.Word64Shl(m.ChangeInt32ToInt64(m.Parameter(0)), m.Int32Constant(32)));
+    Stream s = m.Build();
+    ASSERT_EQ(1U, s.size());
+    EXPECT_EQ(kMips64Dshl, s[0]->arch_opcode());
+    ASSERT_EQ(2U, s[0]->InputCount());
+    EXPECT_EQ(1U, s[0]->OutputCount());
+  }
+}
+
 
 // ----------------------------------------------------------------------------
 // Loads and stores.
 // ----------------------------------------------------------------------------
 
 
 namespace {
 
 struct MemoryAccess {
   MachineType type;
@@ skipping 385 matching lines @@
   EXPECT_EQ(kMips64AbsD, s[0]->arch_opcode());
   ASSERT_EQ(1U, s[0]->InputCount());
   EXPECT_EQ(s.ToVreg(p0), s.ToVreg(s[0]->InputAt(0)));
   ASSERT_EQ(1U, s[0]->OutputCount());
   EXPECT_EQ(s.ToVreg(n), s.ToVreg(s[0]->Output()));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8