PPC: [runtime] Add %ToString and %_ToString and remove the TO_STRING builtin.

src/ppc/code-stubs-ppc.cc

Index: src/ppc/code-stubs-ppc.cc
diff --git a/src/ppc/code-stubs-ppc.cc b/src/ppc/code-stubs-ppc.cc
index 50e8b7f6fab357fefe7af797a961b23a20c0b712..2f76275f1ef5cf942954da7cbc6c73e15899283d 100644
--- a/src/ppc/code-stubs-ppc.cc
+++ b/src/ppc/code-stubs-ppc.cc
@@ -3401,15 +3401,10 @@ void ToNumberStub::Generate(MacroAssembler* masm) {
   __ blr();
   __ bind(&not_smi);
 
-  Label not_heap_number;
-  __ LoadP(r4, FieldMemOperand(r3, HeapObject::kMapOffset));
-  __ lbz(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset));
-  // r3: object
-  // r4: instance type.
-  __ cmpi(r4, Operand(HEAP_NUMBER_TYPE));
-  __ bne(&not_heap_number);
-  __ blr();
-  __ bind(&not_heap_number);
+  __ CompareObjectType(r3, r4, r4, HEAP_NUMBER_TYPE);
+  // r3: receiver
+  // r4: receiver instance type
+  __ Ret(eq);
 
   Label not_string, slow_string;
   __ cmpli(r4, Operand(FIRST_NONSTRING_TYPE));
@@ -3437,6 +3432,36 @@ void ToNumberStub::Generate(MacroAssembler* masm) {
 }
 
 
+void ToStringStub::Generate(MacroAssembler* masm) {
+  // The ToString stub takes one argument in r3.
+  Label is_number;
+  __ JumpIfSmi(r3, &is_number);
+
+  __ CompareObjectType(r3, r4, r4, FIRST_NONSTRING_TYPE);
+  // r3: receiver
+  // r4: receiver instance type
+  __ Ret(lt);
+
+  Label not_heap_number;
+  __ cmpi(r4, Operand(HEAP_NUMBER_TYPE));
+  __ bne(&not_heap_number);
+  __ bind(&is_number);
+  NumberToStringStub stub(isolate());
+  __ TailCallStub(&stub);
+  __ bind(&not_heap_number);
+
+  Label not_oddball;
+  __ cmpi(r4, Operand(ODDBALL_TYPE));
+  __ bne(&not_oddball);
+  __ LoadP(r3, FieldMemOperand(r3, Oddball::kToStringOffset));
+  __ Ret();
+  __ bind(&not_oddball);
+
+  __ push(r3);  // Push argument.
+  __ TailCallRuntime(Runtime::kToString, 1, 1);
+}
+
+
 void StringHelper::GenerateFlatOneByteStringEquals(MacroAssembler* masm,
                                                    Register left,
                                                    Register right,