blob: 4d5bb99053f6d12e54070352934178e092a1802c [file] [log] [blame]
// Copyright 2014 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.
#include "src/compiler/select-lowering.h"
#include "src/compiler/common-operator.h"
#include "src/compiler/diamond.h"
#include "src/compiler/graph.h"
#include "src/compiler/node.h"
#include "src/compiler/node-properties.h"
namespace v8 {
namespace internal {
namespace compiler {
SelectLowering::SelectLowering(Graph* graph, CommonOperatorBuilder* common)
: common_(common), graph_(graph) {}
SelectLowering::~SelectLowering() = default;
Reduction SelectLowering::Reduce(Node* node) {
if (node->opcode() != IrOpcode::kSelect) return NoChange();
SelectParameters const p = SelectParametersOf(node->op());
Node* cond = node->InputAt(0);
Node* vthen = node->InputAt(1);
Node* velse = node->InputAt(2);
// Create a diamond and a phi.
Diamond d(graph(), common(), cond, p.hint());
node->ReplaceInput(0, vthen);
node->ReplaceInput(1, velse);
node->ReplaceInput(2, d.merge);
NodeProperties::ChangeOp(node, common()->Phi(p.representation(), 2));
return Changed(node);
} // namespace compiler
} // namespace internal
} // namespace v8