Use register arguments for RestParamAccessStub

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index ab91deb50c0953c278c6f1a31235c34cf818590d..2782df732c1298e413fa19b3621a7c55cf824f07 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -1969,30 +1969,28 @@ void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
 
 
 void RestParamAccessStub::GenerateNew(MacroAssembler* masm) {
-  // sp[0] : language mode
-  // sp[4] : index of rest parameter
-  // sp[8] : number of parameters
-  // sp[12] : receiver displacement
+  // a2 : number of parameters (tagged)
+  // a3 : parameters pointer
+  // a4 : rest parameter index (tagged)
+  // a1 : language mode (tagged)
   // Check if the calling frame is an arguments adaptor frame.
 
   Label runtime;
-  __ ld(a2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-  __ ld(a3, MemOperand(a2, StandardFrameConstants::kContextOffset));
-  __ Branch(&runtime, ne, a3,
+  __ ld(a0, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ ld(a5, MemOperand(a0, StandardFrameConstants::kContextOffset));
+  __ Branch(&runtime, ne, a5,
             Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
 
   // Patch the arguments.length and the parameters pointer.
-  __ ld(a1, MemOperand(a2, ArgumentsAdaptorFrameConstants::kLengthOffset));
-  __ sd(a1, MemOperand(sp, 2 * kPointerSize));
-  __ SmiScale(at, a1, kPointerSizeLog2);
-
-  __ Daddu(a3, a2, Operand(at));
+  __ ld(a2, MemOperand(a0, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ SmiScale(at, a2, kPointerSizeLog2);
 
+  __ Daddu(a3, a0, Operand(at));
   __ Daddu(a3, a3, Operand(StandardFrameConstants::kCallerSPOffset));
-  __ sd(a3, MemOperand(sp, 3 * kPointerSize));
 
   // Do the runtime call to allocate the arguments object.
   __ bind(&runtime);
+  __ Push(a2, a3, a4, a1);
   __ TailCallRuntime(Runtime::kNewRestParam);
 }