Turn UInt32 analysis into a proper HPhase.

src/hydrogen-uint32-analysis.h

Index: src/hydrogen-uint32-analysis.h
diff --git a/src/hydrogen-infer-representation.h b/src/hydrogen-uint32-analysis.h
similarity index 71%
copy from src/hydrogen-infer-representation.h
copy to src/hydrogen-uint32-analysis.h
index 7c605696c4b956152bdd9dfc74c83e80569e3714..59739d1ccf13ffc428996432417019a8a84c2829 100644
--- a/src/hydrogen-infer-representation.h
+++ b/src/hydrogen-uint32-analysis.h
@@ -25,8 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef V8_HYDROGEN_INFER_REPRESENTATION_H_
-#define V8_HYDROGEN_INFER_REPRESENTATION_H_
+#ifndef V8_HYDROGEN_UINT32_ANALYSIS_H_
+#define V8_HYDROGEN_UINT32_ANALYSIS_H_
 
 #include "hydrogen.h"
 
@@ -34,24 +34,26 @@ namespace v8 {
 namespace internal {
 
 
-class HInferRepresentationPhase : public HPhase {
+// Discover instructions that can be marked with kUint32 flag allowing
+// them to produce full range uint32 values.
+class HUint32AnalysisPhase : public HPhase {
  public:
-  explicit HInferRepresentationPhase(HGraph* graph)
-      : HPhase("H_Infer representations", graph),
-        worklist_(8, zone()),
-        in_worklist_(graph->GetMaximumValueID(), zone()) { }
+  explicit HUint32AnalysisPhase(HGraph* graph)
+      : HPhase("H_Compute safe UInt32 operations", graph), phis_(4, zone()) { }
 
   void Run();
-  void AddToWorklist(HValue* current);
 
  private:
-  ZoneList<HValue*> worklist_;
-  BitVector in_worklist_;
+  INLINE(bool IsSafeUint32Use(HValue* val, HValue* use));
+  INLINE(bool Uint32UsesAreSafe(HValue* uint32val));
+  INLINE(bool CheckPhiOperands(HPhi* phi));
+  INLINE(void UnmarkPhi(HPhi* phi, ZoneList<HPhi*>* worklist));
+  INLINE(void UnmarkUnsafePhis());
 
-  DISALLOW_COPY_AND_ASSIGN(HInferRepresentationPhase);
+  ZoneList<HPhi*> phis_;
 };
 
 
 } }  // namespace v8::internal
 
-#endif  // V8_HYDROGEN_INFER_REPRESENTATION_H_
+#endif  // V8_HYDROGEN_UINT32_ANALYSIS_H_