A64: Port LSeqStringGetChar.

src/a64/lithium-a64.cc

 // Copyright 2013 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 1987 matching lines @@
 }
 
 
 LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
   LOperand* parameter_count = UseRegisterOrConstant(instr->parameter_count());
   return new(zone()) LReturn(UseFixed(instr->value(), x0), parameter_count);
 }
 
 
 LInstruction* LChunkBuilder::DoSeqStringGetChar(HSeqStringGetChar* instr) {
-  Abort(kUnimplemented);
-  return NULL;
+  // TODO(all): Use UseRegisterAtStart and UseRegisterOrConstantAtStart here.
+  // We cannot do it now because the debug code in the implementation changes
+  // temp.
+  LOperand* string = UseRegister(instr->string());
+  LOperand* index = UseRegisterOrConstant(instr->index());
+  LOperand* temp = TempRegister();
+  LSeqStringGetChar* result =
+      new(zone()) LSeqStringGetChar(string, index, temp);
+  return DefineAsRegister(result);
 }
 
 
 LInstruction* LChunkBuilder::DoSeqStringSetChar(HSeqStringSetChar* instr) {
   LOperand* string = UseRegister(instr->string());
   LOperand* index = UseRegister(instr->index());
   LOperand* value = UseRegister(instr->value());
   LOperand* temp = TempRegister();
   LSeqStringSetChar* result =
       new(zone()) LSeqStringSetChar(instr->encoding(),
@@ skipping 554 matching lines @@
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegisterAtStart(instr->function());
   LOperand* temp = TempRegister();
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function, temp);
   return AssignEnvironment(DefineAsRegister(result));
 }
 
 
 } }  // namespace v8::internal