1// Copyright 2013 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_HYDROGEN_UINT32_ANALYSIS_H_
6#define V8_HYDROGEN_UINT32_ANALYSIS_H_
7
8#include "src/hydrogen.h"
9
10namespace v8 {
11namespace internal {
12
13
14// Discover instructions that can be marked with kUint32 flag allowing
15// them to produce full range uint32 values.
16class HUint32AnalysisPhase : public HPhase {
17 public:
18  explicit HUint32AnalysisPhase(HGraph* graph)
19      : HPhase("H_Compute safe UInt32 operations", graph), phis_(4, zone()) { }
20
21  void Run();
22
23 private:
24  INLINE(bool IsSafeUint32Use(HValue* val, HValue* use));
25  INLINE(bool Uint32UsesAreSafe(HValue* uint32val));
26  INLINE(bool CheckPhiOperands(HPhi* phi));
27  INLINE(void UnmarkPhi(HPhi* phi, ZoneList<HPhi*>* worklist));
28  INLINE(void UnmarkUnsafePhis());
29
30  ZoneList<HPhi*> phis_;
31};
32
33
34} }  // namespace v8::internal
35
36#endif  // V8_HYDROGEN_UINT32_ANALYSIS_H_
37