Added %_Likely/%_Unlikely intrinsics (special cases of GCC's __builin_expect).

src/hydrogen.cc

 // Copyright 2013 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/hydrogen.h"
 
 #include <sstream>
 
 #include "src/v8.h"
 
@@ skipping 12026 matching lines @@
 
 void HOptimizedGraphBuilder::GenerateMathSqrt(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* value = Pop();
   HInstruction* result = NewUncasted<HUnaryMathOperation>(value, kMathSqrt);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
+void HOptimizedGraphBuilder::GenerateLikely(CallRuntime* call) {
+  DCHECK(call->arguments()->length() == 1);
+  Visit(call->arguments()->at(0));
+}
+
+
+void HOptimizedGraphBuilder::GenerateUnlikely(CallRuntime* call) {
+  return GenerateLikely(call);
+}
+
+
 HValue* HOptimizedGraphBuilder::BuildOrderedHashTableHashToBucket(
     HValue* hash, HValue* num_buckets) {
   HValue* mask = AddUncasted<HSub>(num_buckets, graph()->GetConstant1());
   mask->ChangeRepresentation(Representation::Integer32());
   mask->ClearFlag(HValue::kCanOverflow);
   return AddUncasted<HBitwise>(Token::BIT_AND, hash, mask);
 }
 
 
 template <typename CollectionType>
@@ skipping 1343 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal