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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "instruction_simplifier.h"
namespace art {
void InstructionSimplifier::Run() {
VisitInsertionOrder();
}
void InstructionSimplifier::VisitSuspendCheck(HSuspendCheck* check) {
HBasicBlock* block = check->GetBlock();
// Currently always keep the suspend check at entry.
if (block->IsEntryBlock()) return;
// Currently always keep suspend checks at loop entry.
if (block->IsLoopHeader() && block->GetFirstInstruction() == check) {
DCHECK(block->GetLoopInformation()->GetSuspendCheck() == check);
return;
}
// Remove the suspend check that was added at build time for the baseline
// compiler.
block->RemoveInstruction(check);
}
void InstructionSimplifier::VisitEqual(HEqual* equal) {
HInstruction* input1 = equal->InputAt(0);
HInstruction* input2 = equal->InputAt(1);
if (input1->GetType() == Primitive::kPrimBoolean && input2->IsIntConstant()) {
if (input2->AsIntConstant()->GetValue() == 1) {
// Replace (bool_value == 1) with bool_value
equal->ReplaceWith(equal->InputAt(0));
equal->GetBlock()->RemoveInstruction(equal);
} else {
// Replace (bool_value == 0) with !bool_value
DCHECK_EQ(input2->AsIntConstant()->GetValue(), 0);
equal->GetBlock()->ReplaceAndRemoveInstructionWith(
equal, new (GetGraph()->GetArena()) HNot(input1));
}
}
}
} // namespace art
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