Range feedback for binary integer operations.

runtime/vm/assembler_arm_test.cc

Index: runtime/vm/assembler_arm_test.cc
diff --git a/runtime/vm/assembler_arm_test.cc b/runtime/vm/assembler_arm_test.cc
index 01f2350b1457233bf424bd539c299643417915ad..42f193d08a237dc1d401a15ef9057cb3af45c69b 100644
--- a/runtime/vm/assembler_arm_test.cc
+++ b/runtime/vm/assembler_arm_test.cc
@@ -4215,6 +4215,61 @@ ASSEMBLER_TEST_GENERATE(StoreIntoObject, assembler) {
   __ Ret();
 }
 
+
+ASSEMBLER_TEST_GENERATE(ComputeRange, assembler) {
+  __ PushList(1 << LR);
+  Label miss, done;
+  __ mov(R1, Operand(R0));
+  __ ComputeRange(R0, R1, R2, &miss);
+  __ b(&done);
+
+  __ Bind(&miss);
+  __ LoadImmediate(R0, -1);
+
+  __ Bind(&done);
+  __ PopList(1 << LR);
+  __ Ret();
+}
+
+
+ASSEMBLER_TEST_RUN(ComputeRange, test) {
+  typedef intptr_t (*ComputeRange)(RawObject* value) DART_UNUSED;
+
+#define RANGE_OF(v)                                              \
+  (EXECUTE_TEST_CODE_INTPTR_INTPTR(                              \
+    ComputeRange, test->entry(), reinterpret_cast<intptr_t>(v)))
+
+  EXPECT_EQ(0, RANGE_OF(Smi::New(0)));
+  EXPECT_EQ(0, RANGE_OF(Smi::New(1)));
+  EXPECT_EQ(ICData::kSignBit, RANGE_OF(Smi::New(-1)));
+  EXPECT_EQ(0, RANGE_OF(Smi::New(Smi::kMaxValue)));
+  EXPECT_EQ(ICData::kSignBit, RANGE_OF(Smi::New(Smi::kMinValue)));
+
+  EXPECT_EQ(ICData::kInt32Bit, RANGE_OF(Integer::New(Smi::kMaxValue + 1)));
+  EXPECT_EQ(ICData::kInt32Bit | ICData::kSignBit,
+            RANGE_OF(Integer::New(Smi::kMinValue - 1)));
+  EXPECT_EQ(ICData::kInt32Bit, RANGE_OF(Integer::New(kMaxInt32)));
+  EXPECT_EQ(ICData::kInt32Bit | ICData::kSignBit,
+            RANGE_OF(Integer::New(kMinInt32)));
+
+  EXPECT_EQ(ICData::kUint32Bit,
+            RANGE_OF(Integer::New(static_cast<int64_t>(kMaxInt32) + 1)));
+  EXPECT_EQ(ICData::kUint32Bit,
+            RANGE_OF(Integer::New(kMaxUint32)));
+
+  EXPECT_EQ(ICData::kInt64Bit,
+            RANGE_OF(Integer::New(static_cast<int64_t>(kMaxUint32) + 1)));
+  EXPECT_EQ(ICData::kInt64Bit,
+            RANGE_OF(Integer::New(static_cast<int64_t>(kMinInt32) - 1)));
+  EXPECT_EQ(ICData::kInt64Bit, RANGE_OF(Integer::New(kMaxInt64)));
+  EXPECT_EQ(ICData::kInt64Bit, RANGE_OF(Integer::New(kMinInt64)));
+
+  EXPECT_EQ(-1, RANGE_OF(Bool::True().raw()));
+
+#undef RANGE_OF
+}
+
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM