[Interpreter] Adds shift operators to interpreter

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index 156d3b4e90cba5ce5bbe995ec46e976702feae83..01f05e7621faa1bfd9369c60e1721c68d1f37d10 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -375,6 +375,33 @@ void Interpreter::DoMod(compiler::InterpreterAssembler* assembler) {
 }
 
 
+// ShiftLeft <src>
+//
+// Left shifts accumulator by the count specified in register <src>.

[oth, 2015/10/07 13:53:17]

Can the comments here and below mention that the accumulator and register will
be cast to Int32 prior to the operation?

[mythria, 2015/10/08 14:33:44]

Done.

+void Interpreter::DoShiftLeft(compiler::InterpreterAssembler* assembler) {
+  DoBinaryOp(Runtime::kShiftLeft, assembler);
+}
+
+
+// ShiftRight <src>
+//
+// Right shifts accumulator by the count specified in register <src>.
+// Result is sign extended.
+void Interpreter::DoShiftRight(compiler::InterpreterAssembler* assembler) {
+  DoBinaryOp(Runtime::kShiftRight, assembler);
+}
+
+
+// ShiftRightLogical <src>
+//
+// Right Shifts accumulator by the count specified in register <src>.
+// Result is zero-filled.
+void Interpreter::DoShiftRightLogical(
+    compiler::InterpreterAssembler* assembler) {
+  DoBinaryOp(Runtime::kShiftRightLogical, assembler);
+}
+
+
 // LogicalNot
 //
 // Perform logical-not on the accumulator, first casting the