PPC: Support for conditional return instruction.

src/ppc/macro-assembler-ppc.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PPC_MACRO_ASSEMBLER_PPC_H_
 #define V8_PPC_MACRO_ASSEMBLER_PPC_H_
 
 #include "src/assembler.h"
 #include "src/bailout-reason.h"
 #include "src/frames.h"
@@ skipping 109 matching lines @@
   void Call(Register target);
   void CallJSEntry(Register target);
   void Call(Address target, RelocInfo::Mode rmode, Condition cond = al);
   int CallSize(Handle<Code> code,
                RelocInfo::Mode rmode = RelocInfo::CODE_TARGET,
                TypeFeedbackId ast_id = TypeFeedbackId::None(),
                Condition cond = al);
   void Call(Handle<Code> code, RelocInfo::Mode rmode = RelocInfo::CODE_TARGET,
             TypeFeedbackId ast_id = TypeFeedbackId::None(),
             Condition cond = al);
-  void Ret(Condition cond = al);
+  void Ret() { blr(); }
+  void Ret(Condition cond, CRegister cr = cr7) { bclr(cond, cr); }
 
   // Emit code to discard a non-negative number of pointer-sized elements
   // from the stack, clobbering only the sp register.
-  void Drop(int count, Condition cond = al);
+  void Drop(int count);
 
-  void Ret(int drop, Condition cond = al);
+  void Ret(int drop) {
+    Drop(drop);
+    blr();
+  }
 
   void Call(Label* target);
 
   // Emit call to the code we are currently generating.
   void CallSelf() {
     Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location()));
     Call(self, RelocInfo::CODE_TARGET);
   }
 
   // Register move. May do nothing if the registers are identical.
@@ skipping 1419 matching lines @@
 #define ACCESS_MASM(masm)    \
   masm->stop(__FILE_LINE__); \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 }
 }  // namespace v8::internal
 
 #endif  // V8_PPC_MACRO_ASSEMBLER_PPC_H_