[turbofan] Add backend support for float32.

src/compiler/x64/instruction-selector-x64-unittest.cc

Index: src/compiler/x64/instruction-selector-x64-unittest.cc
diff --git a/src/compiler/x64/instruction-selector-x64-unittest.cc b/src/compiler/x64/instruction-selector-x64-unittest.cc
index 22f0bce6a089033f0a1c3ec8c6cdddb1887aec15..7204abdd5f0281d8aab9acaee376d5338d74fe75 100644
--- a/src/compiler/x64/instruction-selector-x64-unittest.cc
+++ b/src/compiler/x64/instruction-selector-x64-unittest.cc
@@ -12,6 +12,17 @@ namespace compiler {
 // Conversions.
 
 
+TEST_F(InstructionSelectorTest, ChangeFloat32ToFloat64WithParameter) {
+  StreamBuilder m(this, kMachFloat32, kMachFloat64);
+  m.Return(m.ChangeFloat32ToFloat64(m.Parameter(0)));
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(kSSECvtss2sd, s[0]->arch_opcode());
+  EXPECT_EQ(1U, s[0]->InputCount());
+  EXPECT_EQ(1U, s[0]->OutputCount());
+}
+
+
 TEST_F(InstructionSelectorTest, ChangeInt32ToInt64WithParameter) {
   StreamBuilder m(this, kMachInt64, kMachInt32);
   m.Return(m.ChangeInt32ToInt64(m.Parameter(0)));
@@ -30,6 +41,17 @@ TEST_F(InstructionSelectorTest, ChangeUint32ToUint64WithParameter) {
 }
 
 
+TEST_F(InstructionSelectorTest, TruncateFloat64ToFloat32WithParameter) {
+  StreamBuilder m(this, kMachFloat64, kMachFloat32);
+  m.Return(m.TruncateFloat64ToFloat32(m.Parameter(0)));
+  Stream s = m.Build();
+  ASSERT_EQ(1U, s.size());
+  EXPECT_EQ(kSSECvtsd2ss, s[0]->arch_opcode());
+  EXPECT_EQ(1U, s[0]->InputCount());
+  EXPECT_EQ(1U, s[0]->OutputCount());
+}
+
+
 TEST_F(InstructionSelectorTest, TruncateInt64ToInt32WithParameter) {
   StreamBuilder m(this, kMachInt32, kMachInt64);
   m.Return(m.TruncateInt64ToInt32(m.Parameter(0)));