Added %_Likely/%_Unlikely intrinsics (special cases of GCC's __builin_expect).

test/unittests/compiler/js-intrinsic-lowering-unittest.cc

Index: test/unittests/compiler/js-intrinsic-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
index 8adbc54ac2d9c530ae3c018cc99a014b46815dba..582d78ad3d42e307d2d16079c2117ccf01def6d7 100644
--- a/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
+++ b/test/unittests/compiler/js-intrinsic-lowering-unittest.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "src/compiler/access-builder.h"
+#include "src/compiler/diamond.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-intrinsic-lowering.h"
 #include "src/compiler/js-operator.h"
@@ -10,6 +11,7 @@
 #include "test/unittests/compiler/node-test-utils.h"
 #include "testing/gmock-support.h"
 
+
 using testing::_;
 using testing::AllOf;
 using testing::BitEq;
@@ -243,6 +245,30 @@ TEST_F(JSIntrinsicLoweringTest, InlineJSValueGetValue) {
 
 
 // -----------------------------------------------------------------------------
+// %_Likely
+
+TEST_F(JSIntrinsicLoweringTest, Likely) {
+  Node* const input = Parameter(0);
+  Node* const context = Parameter(1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Node* const likely =
+      graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineLikely, 1),
+                       input, context, effect, control);
+  Node* const to_boolean =
+      graph()->NewNode(javascript()->ToBoolean(), likely, context);
+  Diamond d(graph(), common(), to_boolean);
+  graph()->SetEnd(graph()->NewNode(common()->End(), d.merge));
+
+  ASSERT_EQ(BranchHint::kNone, BranchHintOf(d.branch->op()));
+  Reduction const r = Reduce(likely);
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(), input);
+  ASSERT_EQ(BranchHint::kTrue, BranchHintOf(d.branch->op()));
+}
+
+
+// -----------------------------------------------------------------------------
 // %_MathFloor
 
 
@@ -313,6 +339,30 @@ TEST_F(JSIntrinsicLoweringTest, InlineMathClz32) {
 
 
 // -----------------------------------------------------------------------------
+// %_Unlikely
+
+TEST_F(JSIntrinsicLoweringTest, Unlikely) {
+  Node* const input = Parameter(0);
+  Node* const context = Parameter(1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Node* const unlikely =
+      graph()->NewNode(javascript()->CallRuntime(Runtime::kInlineUnlikely, 1),
+                       input, context, effect, control);
+  Node* const to_boolean =
+      graph()->NewNode(javascript()->ToBoolean(), unlikely, context);
+  Diamond d(graph(), common(), to_boolean);
+  graph()->SetEnd(graph()->NewNode(common()->End(), d.merge));
+
+  ASSERT_EQ(BranchHint::kNone, BranchHintOf(d.branch->op()));
+  Reduction const r = Reduce(unlikely);
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(), input);
+  ASSERT_EQ(BranchHint::kFalse, BranchHintOf(d.branch->op()));
+}
+
+
+// -----------------------------------------------------------------------------
 // %_ValueOf