Vector-ICs: Implement slot sharing for global loads.

src/ast.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ast.h"
 
 #include <cmath>  // For isfinite.
 #include "src/builtins.h"
 #include "src/code-stubs.h"
 #include "src/contexts.h"
@@ skipping 72 matching lines @@
 
 
 void VariableProxy::BindTo(Variable* var) {
   DCHECK((is_this() && var->is_this()) || raw_name() == var->raw_name());
   set_var(var);
   set_is_resolved();
   var->set_is_used();
 }
 
 
+void VariableProxy::SetFirstFeedbackICSlot(FeedbackVectorICSlot slot,
+                                           ICSlotCache* cache) {
+  variable_feedback_slot_ = slot;
+  if (var()->IsUnallocated()) {
+    cache->Add(VariableICSlotPair(var(), slot));
+  }
+}
+
+
+FeedbackVectorRequirements VariableProxy::ComputeFeedbackRequirements(
+    Isolate* isolate, const ICSlotCache* cache) {
+  if (UsesVariableFeedbackSlot()) {
+    // VariableProxies that point to the same Variable within a function can
+    // make their loads from the same IC slot.
+    if (var()->IsUnallocated()) {
+      for (int i = 0; i < cache->length(); i++) {
+        VariableICSlotPair& pair = cache->at(i);
+        if (pair.variable() == var()) {
+          variable_feedback_slot_ = pair.slot();
+          return FeedbackVectorRequirements(0, 0);
+        }
+      }
+    }
+    return FeedbackVectorRequirements(0, 1);
+  }
+  return FeedbackVectorRequirements(0, 0);
+}
+
+
 Assignment::Assignment(Zone* zone, Token::Value op, Expression* target,
                        Expression* value, int pos)
     : Expression(zone, pos),
       bit_field_(IsUninitializedField::encode(false) |
                  KeyTypeField::encode(ELEMENT) |
                  StoreModeField::encode(STANDARD_STORE) |
                  TokenField::encode(op)),
       target_(target),
       value_(value),
       binary_operation_(NULL) {}
@@ skipping 454 matching lines @@
 }
 
 
 bool Call::IsUsingCallFeedbackSlot(Isolate* isolate) const {
   // SuperConstructorCall uses a CallConstructStub, which wants
   // a Slot, not an IC slot.
   return GetCallType(isolate) == SUPER_CALL;
 }
 
 
-FeedbackVectorRequirements Call::ComputeFeedbackRequirements(Isolate* isolate) {
+FeedbackVectorRequirements Call::ComputeFeedbackRequirements(
+    Isolate* isolate, const ICSlotCache* cache) {
   int ic_slots = IsUsingCallFeedbackICSlot(isolate) ? 1 : 0;
   int slots = IsUsingCallFeedbackSlot(isolate) ? 1 : 0;
   // A Call uses either a slot or an IC slot.
   DCHECK((ic_slots & slots) == 0);
   return FeedbackVectorRequirements(slots, ic_slots);
 }
 
 
 Call::CallType Call::GetCallType(Isolate* isolate) const {
   VariableProxy* proxy = expression()->AsVariableProxy();
@@ skipping 411 matching lines @@
 // static
 bool Literal::Match(void* literal1, void* literal2) {
   const AstValue* x = static_cast<Literal*>(literal1)->raw_value();
   const AstValue* y = static_cast<Literal*>(literal2)->raw_value();
   return (x->IsString() && y->IsString() && *x->AsString() == *y->AsString()) ||
          (x->IsNumber() && y->IsNumber() && x->AsNumber() == y->AsNumber());
 }
 
 
 } }  // namespace v8::internal