[turbofan] Add TruncateFloat64ToInt32 machine operator.

test/compiler-unittests/instruction-selector-unittest.cc

Index: test/compiler-unittests/instruction-selector-unittest.cc
diff --git a/test/compiler-unittests/instruction-selector-unittest.cc b/test/compiler-unittests/instruction-selector-unittest.cc
index 91ae7cdd320667c7bf068e4f98c625c9c615ad55..d6fef2e8070d02d43882a42ac10f060019fe9d10 100644
--- a/test/compiler-unittests/instruction-selector-unittest.cc
+++ b/test/compiler-unittests/instruction-selector-unittest.cc
@@ -71,6 +71,10 @@ InstructionSelectorTest::Stream InstructionSelectorTest::StreamBuilder::Build(
 }
 
 
+// -----------------------------------------------------------------------------
+// Return.
+
+
 TARGET_TEST_F(InstructionSelectorTest, ReturnParameter) {
   StreamBuilder m(this, kMachInt32, kMachInt32);
   m.Return(m.Parameter(0));
@@ -96,6 +100,23 @@ TARGET_TEST_F(InstructionSelectorTest, ReturnZero) {
   EXPECT_EQ(1U, s[1]->InputCount());
 }
 
+
+// -----------------------------------------------------------------------------
+// Conversions.
+
+
+TARGET_TEST_F(InstructionSelectorTest, TruncateFloat64ToInt32WithParameter) {
+  StreamBuilder m(this, kMachInt32, kMachFloat64);
+  m.Return(m.TruncateFloat64ToInt32(m.Parameter(0)));
+  Stream s = m.Build(kAllInstructions);
+  ASSERT_EQ(3U, s.size());
+  EXPECT_EQ(kArchNop, s[0]->arch_opcode());
+  EXPECT_EQ(kArchTruncateDoubleToI, s[1]->arch_opcode());
+  EXPECT_EQ(1U, s[1]->InputCount());
+  EXPECT_EQ(1U, s[1]->OutputCount());
+  EXPECT_EQ(kArchRet, s[2]->arch_opcode());
+}
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8