[interpreter] Inline Star on dispatch for some bytecodes

test/unittests/interpreter/interpreter-assembler-unittest.cc

Index: test/unittests/interpreter/interpreter-assembler-unittest.cc
diff --git a/test/unittests/interpreter/interpreter-assembler-unittest.cc b/test/unittests/interpreter/interpreter-assembler-unittest.cc
index 1bc80c0e4a7eeb635cd881c1a87eb9fdfdb77bfa..785ff7e731ca5feb6d4d6061b0971426f4c702fa 100644
--- a/test/unittests/interpreter/interpreter-assembler-unittest.cc
+++ b/test/unittests/interpreter/interpreter-assembler-unittest.cc
@@ -316,6 +316,9 @@ TARGET_TEST_F(InterpreterAssemblerTest, Dispatch) {
     Node* tail_call_node = m.Dispatch();
 
     OperandScale operand_scale = OperandScale::kSingle;
+    bool has_star_lookahead =
+        interpreter::Bytecodes::IsStarLookahead(bytecode, operand_scale);

[rmcilroy, 2016/07/20 10:34:12]

nit - just inline this into if block below

[klaasb, 2016/07/20 11:22:55]

Done.

+
     Matcher<Node*> next_bytecode_offset_matcher = IsIntPtrAdd(
         IsParameter(InterpreterDispatchDescriptor::kBytecodeOffsetParameter),
         IsIntPtrConstant(
@@ -332,6 +335,32 @@ TARGET_TEST_F(InterpreterAssemblerTest, Dispatch) {
         IsParameter(InterpreterDispatchDescriptor::kDispatchTableParameter),
         IsWordShl(target_bytecode_matcher, IsIntPtrConstant(kPointerSizeLog2)));
 
+    if (has_star_lookahead) {
+      Matcher<Node*> after_lookahead_offset =
+          IsIntPtrAdd(next_bytecode_offset_matcher,
+                      IsIntPtrConstant(interpreter::Bytecodes::Size(
+                          Bytecode::kStar, operand_scale)));
+      next_bytecode_offset_matcher =
+          IsPhi(MachineType::PointerRepresentation(),
+                next_bytecode_offset_matcher, after_lookahead_offset, _);
+      Matcher<Node*> after_lookahead_bytecode = m.IsLoad(
+          MachineType::Uint8(),
+          IsParameter(InterpreterDispatchDescriptor::kBytecodeArrayParameter),
+          after_lookahead_offset);
+      if (kPointerSize == 8) {
+        after_lookahead_bytecode =
+            IsChangeUint32ToUint64(after_lookahead_bytecode);
+      }
+      target_bytecode_matcher =
+          IsPhi(MachineRepresentation::kWord8, target_bytecode_matcher,
+                after_lookahead_bytecode, _);
+      code_target_matcher = m.IsLoad(
+          MachineType::Pointer(),
+          IsParameter(InterpreterDispatchDescriptor::kDispatchTableParameter),
+          IsWordShl(target_bytecode_matcher,
+                    IsIntPtrConstant(kPointerSizeLog2)));
+    }
+
     EXPECT_THAT(
         tail_call_node,
         IsTailCall(