[Interpreter] Bytecodes for exchanging registers.

src/interpreter/interpreter.cc

Index: src/interpreter/interpreter.cc
diff --git a/src/interpreter/interpreter.cc b/src/interpreter/interpreter.cc
index a9b12eaed01a19b5c8423ece72f1516205429f95..0eafe40ae1c39e8f00c378acb5587ca482b718f3 100644
--- a/src/interpreter/interpreter.cc
+++ b/src/interpreter/interpreter.cc
@@ -201,6 +201,28 @@ void Interpreter::DoStar(compiler::InterpreterAssembler* assembler) {
 }
 
 
+// Exchange <reg8> <reg16>
+//
+// Exchange two registers.
+void Interpreter::DoExchange(compiler::InterpreterAssembler* assembler) {
+  Node* r0 = __ BytecodeOperandReg(0);
+  Node* r1 = __ BytecodeOperandReg(1);
+  Node* v0 = __ LoadRegister(r0);
+  Node* v1 = __ LoadRegister(r1);

[rmcilroy, 2016/01/04 11:54:54]

nit - non-single character variable names.

[oth, 2016/01/04 14:01:42]

Done.

+  __ StoreRegister(v1, r0);
+  __ StoreRegister(v0, r1);
+  __ Dispatch();
+}
+
+
+// ExchangeWide <reg16> <reg16>
+//
+// Exchange two registers.
+void Interpreter::DoExchangeWide(compiler::InterpreterAssembler* assembler) {
+  return DoExchange(assembler);
+}
+
+
 // Mov <src> <dst>
 //
 // Stores the value of register <src> to register <dst>.