Use same range info when emitting code and computing if instruction can deopt.

runtime/vm/intermediate_language_dbc.cc

 // Copyright (c) 2016, 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/globals.h"  // Needed here to get TARGET_ARCH_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/cpu.h"
@@ skipping 17 matching lines @@
 DECLARE_FLAG(bool, emit_edge_counters);
 DECLARE_FLAG(int, optimization_counter_threshold);
 
 // List of instructions that are still unimplemented by DBC backend.
 #define FOR_EACH_UNIMPLEMENTED_INSTRUCTION(M)                                  \
   M(LoadCodeUnits)                                                             \
   M(BinaryInt32Op)                                                             \
   M(Int32ToDouble)                                                             \
   M(DoubleToInteger)                                                           \
   M(BoxInt64)                                                                  \
-  M(MergedMath)                                                                \
+  M(TruncDivMod)                                                               \
   M(GuardFieldClass)                                                           \
   M(GuardFieldLength)                                                          \
   M(IfThenElse)                                                                \
   M(ExtractNthOutput)                                                          \
   M(BinaryUint32Op)                                                            \
   M(ShiftUint32Op)                                                             \
   M(UnaryUint32Op)                                                             \
   M(UnboxedIntConverter)
 
 // List of instructions that are not used by DBC.
@@ skipping 1275 matching lines @@
 CompileType ShiftUint32OpInstr::ComputeType() const {
   return CompileType::Int();
 }
 
 
 CompileType UnaryUint32OpInstr::ComputeType() const {
   return CompileType::Int();
 }
 
 
-static const intptr_t kMintShiftCountLimit = 63;
-
-
-bool ShiftMintOpInstr::has_shift_count_check() const {
-  return !RangeUtils::IsWithin(right()->definition()->range(), 0,
-                               kMintShiftCountLimit);
-}
-
-
 CompileType LoadIndexedInstr::ComputeType() const {
   switch (class_id_) {
     case kArrayCid:
     case kImmutableArrayCid:
       return CompileType::Dynamic();
 
     case kTypedDataFloat32ArrayCid:
     case kTypedDataFloat64ArrayCid:
       return CompileType::FromCid(kDoubleCid);
     case kTypedDataFloat32x4ArrayCid:
@@ skipping 730 matching lines @@
   }
   __ IfULe(length, index);
   compiler->EmitDeopt(deopt_id(), ICData::kDeoptCheckArrayBound,
                       (generalized_ ? ICData::kGeneralized : 0) |
                           (licm_hoisted_ ? ICData::kHoisted : 0));
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC