diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index 54d5008262..3c8ace7d54 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -2734,6 +2734,40 @@ void Builtins::Generate_Construct(MacroAssembler* masm) {
           RelocInfo::CODE_TARGET);
 }
 
+// static
+void Builtins::Generate_AllocateInNewSpace(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- r4 : requested object size (untagged)
+  //  -- lr : return address
+  // -----------------------------------
+  Label runtime;
+  __ Allocate(r4, r3, r5, r6, &runtime, NO_ALLOCATION_FLAGS);
+  __ Ret();
+
+  __ bind(&runtime);
+  __ SmiTag(r4);
+  __ Push(r4);
+  __ LoadSmiLiteral(cp, Smi::FromInt(0));
+  __ TailCallRuntime(Runtime::kAllocateInNewSpace);
+}
+
+// static
+void Builtins::Generate_AllocateInOldSpace(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- r4 : requested object size (untagged)
+  //  -- lr : return address
+  // -----------------------------------
+  Label runtime;
+  __ Allocate(r4, r3, r5, r6, &runtime, PRETENURE);
+  __ Ret();
+
+  __ bind(&runtime);
+  __ SmiTag(r4);
+  __ LoadSmiLiteral(r5, Smi::FromInt(AllocateTargetSpace::encode(OLD_SPACE)));
+  __ Push(r4, r5);
+  __ LoadSmiLiteral(cp, Smi::FromInt(0));
+  __ TailCallRuntime(Runtime::kAllocateInTargetSpace);
+}
 
 void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
   // ----------- S t a t e -------------
diff --git a/src/ppc/interface-descriptors-ppc.cc b/src/ppc/interface-descriptors-ppc.cc
index e757f322dd..7465effc95 100644
--- a/src/ppc/interface-descriptors-ppc.cc
+++ b/src/ppc/interface-descriptors-ppc.cc
@@ -243,13 +243,6 @@ void AllocateHeapNumberDescriptor::InitializePlatformSpecific(
 SIMD128_TYPES(SIMD128_ALLOC_DESC)
 #undef SIMD128_ALLOC_DESC
 
-void AllocateDescriptor::InitializePlatformSpecific(
-    CallInterfaceDescriptorData* data) {
-  Register registers[] = {r3};
-  data->InitializePlatformSpecific(arraysize(registers), registers);
-}
-
-
 void ArrayConstructorConstantArgCountDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   // register state
diff --git a/src/ppc/macro-assembler-ppc.h b/src/ppc/macro-assembler-ppc.h
index 6624998a0f..0c31f618a3 100644
--- a/src/ppc/macro-assembler-ppc.h
+++ b/src/ppc/macro-assembler-ppc.h
@@ -19,6 +19,7 @@ const Register kReturnRegister1 = {Register::kCode_r4};
 const Register kReturnRegister2 = {Register::kCode_r5};
 const Register kJSFunctionRegister = {Register::kCode_r4};
 const Register kContextRegister = {Register::kCode_r30};
+const Register kAllocateSizeRegister = {Register::kCode_r4};
 const Register kInterpreterAccumulatorRegister = {Register::kCode_r3};
 const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_r15};
 const Register kInterpreterBytecodeArrayRegister = {Register::kCode_r16};