Implement local load/store elimination on basic blocks.

src/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 25 matching lines @@
 #include "hydrogen-bce.h"
 #include "hydrogen-bch.h"
 #include "hydrogen-canonicalize.h"
 #include "hydrogen-dce.h"
 #include "hydrogen-dehoist.h"
 #include "hydrogen-deoptimizing-mark.h"
 #include "hydrogen-environment-liveness.h"
 #include "hydrogen-escape-analysis.h"
 #include "hydrogen-infer-representation.h"
 #include "hydrogen-infer-types.h"
+#include "hydrogen-load-elimination.h"
 #include "hydrogen-gvn.h"
 #include "hydrogen-mark-deoptimize.h"
 #include "hydrogen-minus-zero.h"
 #include "hydrogen-osr.h"
 #include "hydrogen-range-analysis.h"
 #include "hydrogen-redundant-phi.h"
 #include "hydrogen-removable-simulates.h"
 #include "hydrogen-representation-changes.h"
 #include "hydrogen-sce.h"
 #include "hydrogen-uint32-analysis.h"
@@ skipping 2922 matching lines @@
   if (!CheckArgumentsPhiUses()) {
     *bailout_reason = kUnsupportedPhiUseOfArguments;
     return false;
   }
 
   // Remove dead code and phis
   if (FLAG_dead_code_elimination) Run<HDeadCodeEliminationPhase>();
 
   if (FLAG_use_escape_analysis) Run<HEscapeAnalysisPhase>();
 
+  if (FLAG_load_elimination) Run<HLoadEliminationPhase>();
+
   CollectPhis();
 
   if (has_osr()) osr()->FinishOsrValues();
 
   Run<HInferRepresentationPhase>();
 
   // Remove HSimulate instructions that have turned out not to be needed
   // after all by folding them into the following HSimulate.
   // This must happen after inferring representations.
   Run<HMergeRemovableSimulatesPhase>();
@@ skipping 6706 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal