[fullcode][mips][mips64][ppc][s390] Avoid trashing of a home object when doing a count operation wi…

src/full-codegen/mips/full-codegen-mips.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_MIPS
 
 // Note on Mips implementation:
 //
 // The result_register() for mips is the 'v0' register, which is defined
 // by the ABI to contain function return values. However, the first
@@ skipping 3185 matching lines @@
         VisitForStackValue(prop->obj());
         __ lw(LoadDescriptor::ReceiverRegister(), MemOperand(sp, 0));
         EmitNamedPropertyLoad(prop);
         break;
       }
 
       case NAMED_SUPER_PROPERTY: {
         VisitForStackValue(prop->obj()->AsSuperPropertyReference()->this_var());
         VisitForAccumulatorValue(
             prop->obj()->AsSuperPropertyReference()->home_object());
-        PushOperand(result_register());
         const Register scratch = a1;
-        __ lw(scratch, MemOperand(sp, kPointerSize));
-        PushOperands(scratch, result_register());
+        __ lw(scratch, MemOperand(sp, 0));  // this
+        PushOperands(result_register(), scratch, result_register());
         EmitNamedSuperPropertyLoad(prop);
         break;
       }
 
       case KEYED_SUPER_PROPERTY: {
         VisitForStackValue(prop->obj()->AsSuperPropertyReference()->this_var());
-        VisitForAccumulatorValue(
+        VisitForStackValue(
             prop->obj()->AsSuperPropertyReference()->home_object());
-        const Register scratch = a1;
-        const Register scratch1 = t0;
-        __ Move(scratch, result_register());
         VisitForAccumulatorValue(prop->key());
-        PushOperands(scratch, result_register());
-        __ lw(scratch1, MemOperand(sp, 2 * kPointerSize));
-        PushOperands(scratch1, scratch, result_register());
+        const Register scratch1 = a1;
+        const Register scratch2 = t0;
+        __ lw(scratch1, MemOperand(sp, 1 * kPointerSize));  // this
+        __ lw(scratch2, MemOperand(sp, 0 * kPointerSize));  // home object
+        PushOperands(result_register(), scratch1, scratch2, result_register());
         EmitKeyedSuperPropertyLoad(prop);
         break;
       }
 
       case KEYED_PROPERTY: {
         VisitForStackValue(prop->obj());
         VisitForStackValue(prop->key());
         __ lw(LoadDescriptor::ReceiverRegister(),
               MemOperand(sp, 1 * kPointerSize));
         __ lw(LoadDescriptor::NameRegister(), MemOperand(sp, 0));
@@ skipping 551 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OnStackReplacement()->entry()));
   return ON_STACK_REPLACEMENT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS