Introduce InvokeMathCFunction that can be used to directly invoke mathematical function provided by…

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
diff --git a/runtime/vm/intermediate_language.h b/runtime/vm/intermediate_language.h
index 651534614116b0e1217e87fac8823baeed28146a..423e5b8c151e0d01b674337531f25eef529f47b1 100644
--- a/runtime/vm/intermediate_language.h
+++ b/runtime/vm/intermediate_language.h
@@ -48,6 +48,7 @@ class FlowGraphOptimizer;
   V(_Double, round, DoubleRound, 620870996)                                    \
   V(_Double, floor, DoubleFloor, 620870996)                                    \
   V(_Double, ceil, DoubleCeil, 620870996)                                      \
+  V(_Double, pow, DoublePow, 1131958048)                                       \
   V(::, sqrt, MathSqrt, 1662640002)                                            \
 
 // Class that recognizes the name and owner of a function and returns the
@@ -274,7 +275,8 @@ class EmbeddedArray<T, 0> {
   M(UnaryMintOp)                                                               \
   M(CheckArrayBound)                                                           \
   M(Constraint)                                                                \
-  M(StringFromCharCode)
+  M(StringFromCharCode)                                                        \
+  M(InvokeMathCFunction)                                                       \
 
 
 #define FORWARD_DECLARATION(type) class type##Instr;
@@ -515,6 +517,7 @@ FOR_EACH_INSTRUCTION(INSTRUCTION_TYPE_CHECK)
   friend class LICM;
   friend class DoubleToSmiInstr;
   friend class DoubleToDoubleInstr;
+  friend class InvokeMathCFunctionInstr;
 
   intptr_t deopt_id_;
   intptr_t lifetime_position_;  // Position used by register allocator.
@@ -4056,6 +4059,76 @@ class DoubleToDoubleInstr : public TemplateDefinition<1> {
 };
 
 
+class InvokeMathCFunctionInstr : public Definition {
+ public:
+  InvokeMathCFunctionInstr(ZoneGrowableArray<Value*>* inputs,
+                           InstanceCallInstr* instance_call,
+                           MethodRecognizer::Kind recognized_kind)
+    : inputs_(inputs), locs_(NULL), recognized_kind_(recognized_kind) {
+    ASSERT(inputs_->length() == ArgumentCountFor(recognized_kind_));
+    deopt_id_ = instance_call->deopt_id();
+  }
+
+  static intptr_t ArgumentCountFor(MethodRecognizer::Kind recognized_kind_);
+
+  const RuntimeEntry& TargetFunction() const;
+
+  MethodRecognizer::Kind recognized_kind() const { return recognized_kind_; }
+
+  DECLARE_INSTRUCTION(InvokeMathCFunction)
+  virtual RawAbstractType* CompileType() const;
+  virtual void PrintOperandsTo(BufferFormatter* f) const;
+
+  virtual bool CanDeoptimize() const { return false; }
+
+  virtual bool HasSideEffect() const { return false; }
+
+  virtual intptr_t ResultCid() const { return kDoubleCid; }
+
+  virtual Representation representation() const {
+    return kUnboxedDouble;
+  }
+
+  virtual Representation RequiredInputRepresentation(intptr_t idx) const {
+    ASSERT((0 <= idx) && (idx < InputCount()));
+    return kUnboxedDouble;
+  }
+
+  virtual intptr_t DeoptimizationTarget() const { return deopt_id_; }
+
+  virtual intptr_t InputCount() const {
+    return inputs_->length();
+  }
+
+  virtual Value* InputAt(intptr_t i) const {
+    return (*inputs_)[i];
+  }
+
+  virtual void SetInputAt(intptr_t i, Value* value) {
+    ASSERT(value != NULL);
+    (*inputs_)[i] = value;
+  }
+
+  // Returns a structure describing the location constraints required
+  // to emit native code for this definition.
+  LocationSummary* locs() {
+    if (locs_ == NULL) {
+      locs_ = MakeLocationSummary();
+    }
+    return locs_;
+  }
+
+ private:
+  ZoneGrowableArray<Value*>* inputs_;
+
+  LocationSummary* locs_;
+
+  const MethodRecognizer::Kind recognized_kind_;
+
+  DISALLOW_COPY_AND_ASSIGN(InvokeMathCFunctionInstr);
+};
+
+
 class CheckClassInstr : public TemplateInstruction<1> {
  public:
   CheckClassInstr(Value* value,