Use builtin fmod for double modulo operation.

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
 #include "vm/flow_graph_builder.h"
@@ skipping 2614 matching lines @@
 intptr_t InvokeMathCFunctionInstr::ArgumentCountFor(
     MethodRecognizer::Kind kind) {
   switch (kind) {
     case MethodRecognizer::kDoubleTruncate:
     case MethodRecognizer::kDoubleRound:
     case MethodRecognizer::kDoubleFloor:
     case MethodRecognizer::kDoubleCeil: {
       ASSERT(!CPUFeatures::double_truncate_round_supported());
       return 1;
     }
+    case MethodRecognizer::kDoubleMod:
     case MethodRecognizer::kDoublePow:
       return 2;
     default:
       UNREACHABLE();
   }
   return 0;
 }
 
 // Use expected function signatures to help MSVC compiler resolve overloading.
 typedef double (*UnaryMathCFunction) (double x);
 typedef double (*BinaryMathCFunction) (double x, double y);
 
 extern const RuntimeEntry kPowRuntimeEntry(
     "libc_pow", reinterpret_cast<RuntimeFunction>(
         static_cast<BinaryMathCFunction>(&pow)), 0, true);
 
+extern const RuntimeEntry kModRuntimeEntry(
+    "libc_fmod", reinterpret_cast<RuntimeFunction>(
+        static_cast<BinaryMathCFunction>(&fmod)), 0, true);
+
 extern const RuntimeEntry kFloorRuntimeEntry(
     "libc_floor", reinterpret_cast<RuntimeFunction>(
         static_cast<UnaryMathCFunction>(&floor)), 0, true);
 
 extern const RuntimeEntry kCeilRuntimeEntry(
     "libc_ceil", reinterpret_cast<RuntimeFunction>(
         static_cast<UnaryMathCFunction>(&ceil)), 0, true);
 
 extern const RuntimeEntry kTruncRuntimeEntry(
     "libc_trunc", reinterpret_cast<RuntimeFunction>(
         static_cast<UnaryMathCFunction>(&trunc)), 0, true);
 
 extern const RuntimeEntry kRoundRuntimeEntry(
     "libc_round", reinterpret_cast<RuntimeFunction>(
         static_cast<UnaryMathCFunction>(&round)), 0, true);
 
 
 const RuntimeEntry& InvokeMathCFunctionInstr::TargetFunction() const {
   switch (recognized_kind_) {
     case MethodRecognizer::kDoubleTruncate:
       return kTruncRuntimeEntry;
     case MethodRecognizer::kDoubleRound:
       return kRoundRuntimeEntry;
     case MethodRecognizer::kDoubleFloor:
       return kFloorRuntimeEntry;
     case MethodRecognizer::kDoubleCeil:
       return kCeilRuntimeEntry;
     case MethodRecognizer::kDoublePow:
       return kPowRuntimeEntry;
+    case MethodRecognizer::kDoubleMod:
+      return kModRuntimeEntry;
     default:
       UNREACHABLE();
   }
   return kPowRuntimeEntry;
 }
 
 
 #undef __
 
 }  // namespace dart