[fullcode][mips][mips64][ppc][s390] Avoid trashing of a home object when doing a keyed store to a...

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 1674 matching lines @@
       VisitForAccumulatorValue(
           property->obj()->AsSuperPropertyReference()->home_object());
       PushOperand(result_register());
       if (expr->is_compound()) {
         const Register scratch = a1;
         __ lw(scratch, MemOperand(sp, kPointerSize));
         PushOperands(scratch, result_register());
       }
       break;
     case KEYED_SUPER_PROPERTY: {
-      const Register scratch = a1;
       VisitForStackValue(
           property->obj()->AsSuperPropertyReference()->this_var());
-      VisitForAccumulatorValue(
+      VisitForStackValue(
           property->obj()->AsSuperPropertyReference()->home_object());
-      __ Move(scratch, result_register());
       VisitForAccumulatorValue(property->key());
-      PushOperands(scratch, result_register());
+      PushOperand(result_register());
       if (expr->is_compound()) {
         const Register scratch1 = t0;
+        const Register scratch2 = a1;
         __ lw(scratch1, MemOperand(sp, 2 * kPointerSize));
-        PushOperands(scratch1, scratch, result_register());
+        __ lw(scratch2, MemOperand(sp, 1 * kPointerSize));
+        PushOperands(scratch1, scratch2, result_register());
       }
       break;
     }
     case KEYED_PROPERTY:
       // We need the key and receiver on both the stack and in v0 and a1.
       if (expr->is_compound()) {
         VisitForStackValue(property->obj());
         VisitForStackValue(property->key());
         __ lw(LoadDescriptor::ReceiverRegister(),
               MemOperand(sp, 1 * kPointerSize));
@@ skipping 2083 matching lines @@
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OnStackReplacement()->entry()));
   return ON_STACK_REPLACEMENT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS