Remove instructions and infrastructure related to IDEFs that is now obsolete (and was never turned …

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 2964 matching lines @@
 
   if (FLAG_use_gvn) Run<HGlobalValueNumberingPhase>();
 
   if (FLAG_use_range) Run<HRangeAnalysisPhase>();
 
   Run<HComputeMinusZeroChecksPhase>();
 
   // Eliminate redundant stack checks on backwards branches.
   Run<HStackCheckEliminationPhase>();
 
-  if (FLAG_idefs) SetupInformativeDefinitions();
-  if (FLAG_array_bounds_checks_elimination && !FLAG_idefs) {
+  if (FLAG_array_bounds_checks_elimination) {
     Run<HBoundsCheckEliminationPhase>();
   }
-  if (FLAG_array_bounds_checks_hoisting && !FLAG_idefs) {
+  if (FLAG_array_bounds_checks_hoisting) {
     Run<HBoundsCheckHoistingPhase>();
   }
   if (FLAG_array_index_dehoisting) Run<HDehoistIndexComputationsPhase>();
   if (FLAG_dead_code_elimination) Run<HDeadCodeEliminationPhase>();
 
   RestoreActualValues();
 
   return true;
 }
 
 
-void HGraph::SetupInformativeDefinitionsInBlock(HBasicBlock* block) {
-  for (int phi_index = 0; phi_index < block->phis()->length(); phi_index++) {
-    HPhi* phi = block->phis()->at(phi_index);
-    phi->AddInformativeDefinitions();
-    phi->SetFlag(HValue::kIDefsProcessingDone);
-    // We do not support phis that "redefine just one operand".
-    ASSERT(!phi->IsInformativeDefinition());
-  }
-
-  for (HInstructionIterator it(block); !it.Done(); it.Advance()) {
-    HInstruction* i = it.Current();
-    i->AddInformativeDefinitions();
-    i->SetFlag(HValue::kIDefsProcessingDone);
-    i->UpdateRedefinedUsesWhileSettingUpInformativeDefinitions();
-  }
-}
-
-
-// This method is recursive, so if its stack frame is large it could
-// cause a stack overflow.
-// To keep the individual stack frames small we do the actual work inside
-// SetupInformativeDefinitionsInBlock();
-void HGraph::SetupInformativeDefinitionsRecursively(HBasicBlock* block) {
-  SetupInformativeDefinitionsInBlock(block);
-  for (int i = 0; i < block->dominated_blocks()->length(); ++i) {
-    SetupInformativeDefinitionsRecursively(block->dominated_blocks()->at(i));
-  }
-
-  for (HInstructionIterator it(block); !it.Done(); it.Advance()) {
-    HInstruction* i = it.Current();
-    if (i->IsBoundsCheck()) {
-      HBoundsCheck* check = HBoundsCheck::cast(i);
-      check->ApplyIndexChange();
-    }
-  }
-}
-
-
-void HGraph::SetupInformativeDefinitions() {
-  HPhase phase("H_Setup informative definitions", this);
-  SetupInformativeDefinitionsRecursively(entry_block());
-}
-
-
 void HGraph::RestoreActualValues() {
   HPhase phase("H_Restore actual values", this);
 
   for (int block_index = 0; block_index < blocks()->length(); block_index++) {
     HBasicBlock* block = blocks()->at(block_index);
 
 #ifdef DEBUG
     for (int i = 0; i < block->phis()->length(); i++) {
       HPhi* phi = block->phis()->at(i);
       ASSERT(phi->ActualValue() == phi);
@@ skipping 6724 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal