Add an IC for CompareNil operations

src/x64/lithium-x64.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 196 matching lines @@
 
 void LCmpIDAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if ");
   left()->PrintTo(stream);
   stream->Add(" %s ", Token::String(op()));
   right()->PrintTo(stream);
   stream->Add(" then B%d else B%d", true_block_id(), false_block_id());
 }
 
 
-void LIsNilAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if ");
-  value()->PrintTo(stream);
-  stream->Add(kind() == kStrictEquality ? " === " : " == ");
-  stream->Add(nil() == kNullValue ? "null" : "undefined");
-  stream->Add(" then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
 void LIsObjectAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if is_object(");
   value()->PrintTo(stream);
   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 }
 
 
 void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if is_string(");
   value()->PrintTo(stream);
@@ skipping 1385 matching lines @@
 }
 
 
 LInstruction* LChunkBuilder::DoCompareConstantEqAndBranch(
     HCompareConstantEqAndBranch* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
   return new(zone()) LCmpConstantEqAndBranch(value);
 }
 
 
-LInstruction* LChunkBuilder::DoIsNilAndBranch(HIsNilAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* temp = instr->kind() == kStrictEquality ? NULL : TempRegister();
-  return new(zone()) LIsNilAndBranch(UseRegisterAtStart(instr->value()), temp);
-}
-
-
 LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   return new(zone()) LIsObjectAndBranch(UseRegisterAtStart(instr->value()));
 }
 
 
 LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   LOperand* value = UseRegisterAtStart(instr->value());
   LOperand* temp = TempRegister();
@@ skipping 879 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64