Delete useless --loop-weight flag

killing a static variable in the process.

BUG=chromium:333871
LOG=N
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/131223009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18587 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/flag-definitions.h

@@ -322,7 +322,6 @@ DEFINE_bool(flush_optimized_code_cache, true,
 DEFINE_bool(inline_construct, true, "inline constructor calls")
 DEFINE_bool(inline_arguments, true, "inline functions with arguments object")
 DEFINE_bool(inline_accessors, true, "inline JavaScript accessors")
-DEFINE_int(loop_weight, 1, "loop weight for representation inference")
 DEFINE_int(escape_analysis_iterations, 2,
            "maximum number of escape analysis fix-point iterations")
 

src/hydrogen-instructions.cc

@@ -54,14 +54,6 @@ HYDROGEN_CONCRETE_INSTRUCTION_LIST(DEFINE_COMPILE)
 #undef DEFINE_COMPILE
 
 
-int HValue::LoopWeight() const {
-  const int w = FLAG_loop_weight;
-  static const int weights[] = { 1, w, w*w, w*w*w, w*w*w*w };
-  return weights[Min(block()->LoopNestingDepth(),
-                     static_cast<int>(ARRAY_SIZE(weights)-1))];
-}
-
-
 Isolate* HValue::isolate() const {
   ASSERT(block() != NULL);
   return block()->isolate();
@@ -106,7 +98,7 @@ Representation HValue::RepresentationFromUses() {
              id(), Mnemonic(), use->id(), use->Mnemonic(), rep.Mnemonic(),
              (use->CheckFlag(kTruncatingToInt32) ? "-trunc" : ""));
     }
-    use_count[rep.kind()] += use->LoopWeight();
+    use_count[rep.kind()] += 1;
   }
   if (IsPhi()) HPhi::cast(this)->AddIndirectUsesTo(&use_count[0]);
   int tagged_count = use_count[Representation::kTagged];
@@ -2357,7 +2349,7 @@ void HPhi::InitRealUses(int phi_id) {
     HValue* value = it.value();
     if (!value->IsPhi()) {
       Representation rep = value->observed_input_representation(it.index());
-      non_phi_uses_[rep.kind()] += value->LoopWeight();
+      non_phi_uses_[rep.kind()] += 1;
       if (FLAG_trace_representation) {
         PrintF("#%d Phi is used by real #%d %s as %s\n",
                id(), value->id(), value->Mnemonic(), rep.Mnemonic());

src/hydrogen-instructions.h

@@ -645,7 +645,6 @@ class HValue : public ZoneObject {
 
   HBasicBlock* block() const { return block_; }
   void SetBlock(HBasicBlock* block);
-  int LoopWeight() const;
 
   // Note: Never call this method for an unlinked value.
   Isolate* isolate() const;