[turbofan] Introduce dedicated CallFrequency class.

src/compiler/js-operator.cc

 // Copyright 2014 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/compiler/js-operator.h"
 
 #include <limits>
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/feedback-vector.h"
 #include "src/handles-inl.h"
 #include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
+std::ostream& operator<<(std::ostream& os, CallFrequency f) {
+  if (f.IsUnknown()) return os << "unknown";
+  return os << f.value();
+}
+
 VectorSlotPair::VectorSlotPair() {}
 
 
 int VectorSlotPair::index() const {
   return vector_.is_null() ? -1 : FeedbackVector::GetIndex(slot_);
 }
 
 
 bool operator==(VectorSlotPair const& lhs, VectorSlotPair const& rhs) {
   return lhs.slot() == rhs.slot() &&
@@ skipping 710 matching lines @@
 const Operator* JSOperatorBuilder::CallForwardVarargs(
     uint32_t start_index, TailCallMode tail_call_mode) {
   CallForwardVarargsParameters parameters(start_index, tail_call_mode);
   return new (zone()) Operator1<CallForwardVarargsParameters>(   // --
       IrOpcode::kJSCallForwardVarargs, Operator::kNoProperties,  // opcode
       "JSCallForwardVarargs",                                    // name
       2, 1, 1, 1, 1, 2,                                          // counts
       parameters);                                               // parameter
 }
 
-const Operator* JSOperatorBuilder::Call(size_t arity, float frequency,
+const Operator* JSOperatorBuilder::Call(size_t arity, CallFrequency frequency,
                                         VectorSlotPair const& feedback,
                                         ConvertReceiverMode convert_mode,
                                         TailCallMode tail_call_mode) {
   CallParameters parameters(arity, frequency, feedback, tail_call_mode,
                             convert_mode);
   return new (zone()) Operator1<CallParameters>(   // --
       IrOpcode::kJSCall, Operator::kNoProperties,  // opcode
       "JSCall",                                    // name
       parameters.arity(), 1, 1, 1, 1, 2,           // inputs/outputs
       parameters);                                 // parameter
@@ skipping 25 matching lines @@
                                                size_t arity) {
   CallRuntimeParameters parameters(f->function_id, arity);
   DCHECK(f->nargs == -1 || f->nargs == static_cast<int>(parameters.arity()));
   return new (zone()) Operator1<CallRuntimeParameters>(   // --
       IrOpcode::kJSCallRuntime, Operator::kNoProperties,  // opcode
       "JSCallRuntime",                                    // name
       parameters.arity(), 1, 1, f->result_size, 1, 2,     // inputs/outputs
       parameters);                                        // parameter
 }
 
-const Operator* JSOperatorBuilder::Construct(uint32_t arity, float frequency,
+const Operator* JSOperatorBuilder::Construct(uint32_t arity,
+                                             CallFrequency frequency,
                                              VectorSlotPair const& feedback) {
   ConstructParameters parameters(arity, frequency, feedback);
   return new (zone()) Operator1<ConstructParameters>(   // --
       IrOpcode::kJSConstruct, Operator::kNoProperties,  // opcode
       "JSConstruct",                                    // name
       parameters.arity(), 1, 1, 1, 1, 2,                // counts
       parameters);                                      // parameter
 }
 
 const Operator* JSOperatorBuilder::ConstructWithSpread(uint32_t arity) {
@@ skipping 267 matching lines @@
   return new (zone()) Operator1<Handle<ScopeInfo>>(               // --
       IrOpcode::kJSCreateScriptContext, Operator::kNoProperties,  // opcode
       "JSCreateScriptContext",                                    // name
       1, 1, 1, 1, 1, 2,                                           // counts
       scope_info);                                                // parameter
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8