VM: Avoid repeated deoptimization on speculatively hoisted smi-checks.

runtime/vm/intermediate_language_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/dart_entry.h"
@@ skipping 3022 matching lines @@
   LocationSummary* summary = new(isolate) LocationSummary(
       isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   summary->set_in(1, Location::RequiresRegister());
   return summary;
 }
 
 
 void CheckEitherNonSmiInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Label* deopt = compiler->AddDeoptStub(deopt_id(),
-                                        ICData::kDeoptBinaryDoubleOp);
+                                        ICData::kDeoptBinaryDoubleOp,
+                                        licm_hoisted_ ? ICData::kHoisted : 0);
   intptr_t left_cid = left()->Type()->ToCid();
   intptr_t right_cid = right()->Type()->ToCid();
   const Register left = locs()->in(0).reg();
   const Register right = locs()->in(1).reg();
   if (left_cid == kSmiCid) {
     __ tsti(right, Immediate(kSmiTagMask));
   } else if (right_cid == kSmiCid) {
     __ tsti(left, Immediate(kSmiTagMask));
   } else {
     __ orr(TMP, left, Operand(right));
@@ skipping 2049 matching lines @@
   const intptr_t kNumTemps = 0;
   LocationSummary* summary = new(isolate) LocationSummary(
       isolate, kNumInputs, kNumTemps, LocationSummary::kNoCall);
   summary->set_in(0, Location::RequiresRegister());
   return summary;
 }
 
 
 void CheckSmiInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register value = locs()->in(0).reg();
-  Label* deopt = compiler->AddDeoptStub(deopt_id(), ICData::kDeoptCheckSmi);
+  Label* deopt = compiler->AddDeoptStub(deopt_id(),
+                                        ICData::kDeoptCheckSmi,
+                                        licm_hoisted_ ? ICData::kHoisted : 0);
   __ tsti(value, Immediate(kSmiTagMask));
   __ b(deopt, NE);
 }
 
 
 LocationSummary* CheckArrayBoundInstr::MakeLocationSummary(Isolate* isolate,
                                                            bool opt) const {
   const intptr_t kNumInputs = 2;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs = new(isolate) LocationSummary(
@@ skipping 477 matching lines @@
   compiler->GenerateCall(token_pos(), &label, stub_kind_, locs());
 #if defined(DEBUG)
   __ LoadImmediate(R4, kInvalidObjectPointer, kNoPP);
   __ LoadImmediate(R5, kInvalidObjectPointer, kNoPP);
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64