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

runtime/vm/assembler_arm_test.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"
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/os.h"
 #include "vm/unit_test.h"
@@ skipping 1512 matching lines @@
 
 
 ASSEMBLER_TEST_RUN(Sdiv_corner, test) {
   EXPECT(test != NULL);
   typedef int (*Tst)();
   EXPECT_EQ(static_cast<int32_t>(0x80000000),
             EXECUTE_TEST_CODE_INT32(Tst, test->entry()));
 }
 
 
+ASSEMBLER_TEST_GENERATE(IntDiv_supported, assembler) {
+  bool orig = CPUFeatures::integer_division_supported();
+  CPUFeatures::set_integer_division_supported(true);
+  __ mov(R0, ShifterOperand(27));
+  __ mov(R1, ShifterOperand(9));
+  __ IntegerDivide(R0, R0, R1, D0, D1);
+  CPUFeatures::set_integer_division_supported(orig);
+  __ bx(LR);
+}
+
+
+ASSEMBLER_TEST_RUN(IntDiv_supported, test) {
+  EXPECT(test != NULL);
+  typedef int (*Tst)();
+  EXPECT_EQ(3, EXECUTE_TEST_CODE_INT32(Tst, test->entry()));
+}
+
+
+ASSEMBLER_TEST_GENERATE(IntDiv_unsupported, assembler) {
+  bool orig = CPUFeatures::integer_division_supported();
+  CPUFeatures::set_integer_division_supported(false);
+  __ mov(R0, ShifterOperand(27));
+  __ mov(R1, ShifterOperand(9));
+  __ IntegerDivide(R0, R0, R1, D0, D1);
+  CPUFeatures::set_integer_division_supported(orig);
+  __ bx(LR);
+}
+
+
+ASSEMBLER_TEST_RUN(IntDiv_unsupported, test) {
+  EXPECT(test != NULL);
+  typedef int (*Tst)();
+  EXPECT_EQ(3, EXECUTE_TEST_CODE_INT32(Tst, test->entry()));
+}
+
+
 ASSEMBLER_TEST_GENERATE(Muls, assembler) {
   __ mov(R0, ShifterOperand(3));
   __ LoadImmediate(R1, -9);
   __ muls(R2, R0, R1);
   __ mov(R0, ShifterOperand(42), MI);
   __ bx(LR);
 }
 
 
 ASSEMBLER_TEST_RUN(Muls, test) {
@@ skipping 14 matching lines @@
   __ StoreIntoObject(R2,
                      FieldAddress(R2, GrowableObjectArray::data_offset()),
                      R1);
   __ PopList((1 << CTX) | (1 << LR));
   __ Ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM