Adds support for integer division for ARM chips without the sdiv instruction.

runtime/vm/assembler_arm.h

 // 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.
 
 #ifndef VM_ASSEMBLER_ARM_H_
 #define VM_ASSEMBLER_ARM_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm.h directly; use assembler.h instead.
 #endif
@@ skipping 531 matching lines @@
   void AddImmediate(Register rd, Register rn, int32_t value,
                     Condition cond = AL);
   void AddImmediateSetFlags(Register rd, Register rn, int32_t value,
                             Condition cond = AL);
   void AddImmediateWithCarry(Register rd, Register rn, int32_t value,
                              Condition cond = AL);
 
   // Compare rn with signed immediate value. May clobber IP.
   void CompareImmediate(Register rn, int32_t value, Condition cond = AL);
 
+  // Signed integer division of left by right. Checks to see if integer
+  // division is supported. If not, uses the FPU for division with
+  // temporary registers tmpl and tmpr. tmpl may not be DTMP, but tmpr may.
+  void IntegerDivide(Register result, Register left, Register right,

[regis, 2013/07/01 16:54:09]

You could remove the restriction ("tmpl may not be DTMP, but tmpr may") by using
the S registers overlapped by tmpl and tmpr.

[zra, 2013/07/01 17:43:46]

Done.

+                     DRegister tmpl, DRegister tmpr);
+
   // Load and Store. May clobber IP.
   void LoadImmediate(Register rd, int32_t value, Condition cond = AL);
   void LoadSImmediate(SRegister sd, float value, Condition cond = AL);
   void LoadDImmediate(DRegister dd, double value,
                       Register scratch, Condition cond = AL);
 
   void MarkExceptionHandler(Label* label);
 
   void Drop(intptr_t stack_elements);
 
@@ skipping 243 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_