select-lowering.cc

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// 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/graph-assembler.h"
#include "src/compiler/node.h"
#include "src/compiler/turbofan-graph.h"
 
namespace v8 {
namespace internal {
namespace compiler {
 
SelectLowering::SelectLowering(JSGraphAssembler* graph_assembler,
                               TFGraph* graph)
    : graph_assembler_(graph_assembler), start_(graph->start()) {}
 
SelectLowering::~SelectLowering() = default;
 
Reduction SelectLowering::Reduce(Node* node) {
  if (node->opcode() != IrOpcode::kSelect) return NoChange();
  return LowerSelect(node);
}
 
#define __ gasm()->
 
Reduction SelectLowering::LowerSelect(Node* node) {
  SelectParameters const p = SelectParametersOf(node->op());
 
  Node* condition = node->InputAt(0);
  Node* vtrue = node->InputAt(1);
  Node* vfalse = node->InputAt(2);
 
  bool reset_gasm = false;
  if (gasm()->control() == nullptr) {
    gasm()->InitializeEffectControl(start(), start());
    reset_gasm = true;
  }
 
  auto done = __ MakeLabel(p.representation());
 
  __ GotoIf(condition, &done, vtrue);
  __ Goto(&done, vfalse);
  __ Bind(&done);
 
  if (reset_gasm) {
    gasm()->Reset();
  }
 
  return Changed(done.PhiAt(0));
}
 
#undef __
 
}  // namespace compiler
}  // namespace internal
}  // namespace v8