Support non-deoptimizing version of UnboxInt32 for integer definitions.

runtime/vm/intermediate_language_arm.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/globals.h"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/cpu.h"
@@ skipping 3974 matching lines @@
   const Register temp = CanDeoptimize() ? locs()->temp(0).reg() : kNoRegister;
   Label* deopt = CanDeoptimize() ?
         compiler->AddDeoptStub(GetDeoptId(), ICData::kDeoptUnboxInteger) : NULL;
   Label* out_of_range = !is_truncating() ? deopt : NULL;
   ASSERT(value != out);
 
   if (value_cid == kSmiCid) {
     __ SmiUntag(out, value);
   } else if (value_cid == kMintCid) {
     LoadInt32FromMint(compiler, value, out, temp, out_of_range);
+  } else if (!CanDeoptimize()) {
+    Label done;
+    __ SmiUntag(out, value, &done);
+    LoadInt32FromMint(compiler, value, out, temp, out_of_range);

[Florian Schneider, 2014/12/02 13:12:03]

s/out_of_range/NULL/

since it is always NULL in this case?

[Vyacheslav Egorov (Google), 2014/12/02 13:15:58]

Done.

+    __ Bind(&done);
   } else {
     Label done;
     __ SmiUntag(out, value, &done);
     __ CompareClassId(value, kMintCid, temp);
     __ b(deopt, NE);
     LoadInt32FromMint(compiler, value, out, temp, out_of_range);
     __ Bind(&done);
   }
 }
 
@@ skipping 2898 matching lines @@
   compiler->GenerateCall(token_pos(), &label, stub_kind_, locs());
 #if defined(DEBUG)
   __ LoadImmediate(R4, kInvalidObjectPointer);
   __ LoadImmediate(R5, kInvalidObjectPointer);
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM