[Interpreter] Save and restore dispatch table pointer during calls.

src/mips64/builtins-mips64.cc

Index: src/mips64/builtins-mips64.cc
diff --git a/src/mips64/builtins-mips64.cc b/src/mips64/builtins-mips64.cc
index 3b1628eed37c22751615516241295cac0a461a2e..50eebce1652393a67dc756041ed723795257a1ce 100644
--- a/src/mips64/builtins-mips64.cc
+++ b/src/mips64/builtins-mips64.cc
@@ -970,6 +970,10 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
   __ Daddu(fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp));
   __ Push(a3);
 
+  // Push dispatch table pointer.
+  __ li(a0, Operand(ExternalReference::interpreter_dispatch_table_address(
+                masm->isolate())));
+  __ Push(a0);

[balazs.kilvady, 2016/02/11 10:44:01]

You could use __ Push(a0, zero_reg); to save one daddu(sp, ...); instruction.

[rmcilroy, 2016/02/11 12:30:12]

Done.

   // Push zero for bytecode array offset.
   __ Push(zero_reg);
 
@@ -1029,9 +1033,8 @@ void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
            Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
   __ li(kInterpreterBytecodeOffsetRegister,
         Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
-  __ li(kInterpreterDispatchTableRegister,
-        Operand(ExternalReference::interpreter_dispatch_table_address(
-            masm->isolate())));
+  __ lw(kInterpreterDispatchTableRegister,
+        MemOperand(fp, InterpreterFrameConstants::kDispatchTableFromFp));
 
   // Dispatch to the first bytecode handler for the function.
   __ Daddu(a0, kInterpreterBytecodeArrayRegister,