Fix register trashing in Emit*ByteSeqStringSetChar

src/mips/full-codegen-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3531 matching lines @@
 void FullCodeGenerator::EmitOneByteSeqStringSetChar(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   ASSERT_EQ(3, args->length());
 
   Register string = v0;
   Register index = a1;
   Register value = a2;
 
   VisitForStackValue(args->at(1));  // index
   VisitForStackValue(args->at(2));  // value
+  VisitForAccumulatorValue(args->at(0));  // string
   __ Pop(index, value);
-  VisitForAccumulatorValue(args->at(0));  // string
 
   if (FLAG_debug_code) {
     static const uint32_t one_byte_seq_type = kSeqStringTag | kOneByteStringTag;
     EmitSeqStringSetCharCheck(string, index, value, one_byte_seq_type);
   }
 
   __ SmiUntag(value, value);
   __ Addu(at,
           string,
           Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
   __ SmiUntag(index);
   __ Addu(at, at, index);
   __ sb(value, MemOperand(at));
   context()->Plug(string);
 }
 
 
 void FullCodeGenerator::EmitTwoByteSeqStringSetChar(CallRuntime* expr) {
   ZoneList<Expression*>* args = expr->arguments();
   ASSERT_EQ(3, args->length());
 
   Register string = v0;
   Register index = a1;
   Register value = a2;
 
   VisitForStackValue(args->at(1));  // index
   VisitForStackValue(args->at(2));  // value
+  VisitForAccumulatorValue(args->at(0));  // string
   __ Pop(index, value);
-  VisitForAccumulatorValue(args->at(0));  // string
 
   if (FLAG_debug_code) {
     static const uint32_t two_byte_seq_type = kSeqStringTag | kTwoByteStringTag;
     EmitSeqStringSetCharCheck(string, index, value, two_byte_seq_type);
   }
 
   __ SmiUntag(value, value);
   __ Addu(at,
           string,
           Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
@@ skipping 1423 matching lines @@
       Assembler::target_address_at(pc_immediate_load_address)) ==
          reinterpret_cast<uint32_t>(
              isolate->builtins()->OsrAfterStackCheck()->entry()));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS