Support unaligned integer loads on ARM and MIPS.

tests/language/vm/unaligned_access_literal_index_test.dart

+// Copyright (c) 2016, 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.
+// VMOptions=--optimization_counter_threshold=10 --no-background_compilation
+
+import 'dart:typed_data';
+import 'package:expect/expect.dart';
+
+unalignedUint16() {
+  var bytes = new ByteData(64);
+  bytes.setUint16(0, 0xABCD);
+  Expect.equals(0xABCD, bytes.getUint16(0));
+  bytes.setUint16(1, 0xBCDE);
+  Expect.equals(0xBCDE, bytes.getUint16(1));
+}
+
+unalignedInt16() {
+  var bytes = new ByteData(64);
+  bytes.setInt16(0, -0x1234);
+  Expect.equals(-0x1234, bytes.getInt16(0));
+  bytes.setInt16(1, -0x2345);
+  Expect.equals(-0x2345, bytes.getInt16(1));
+}
+
+unalignedUint32() {
+  var bytes = new ByteData(64);
+  bytes.setUint32(0, 0xABCDABCD);
+  Expect.equals(0xABCDABCD, bytes.getUint32(0));
+  bytes.setUint32(1, 0xBCDEBCDE);
+  Expect.equals(0xBCDEBCDE, bytes.getUint32(1));
+  bytes.setUint32(2, 0xABCDABCD);
+  Expect.equals(0xABCDABCD, bytes.getUint32(2));
+  bytes.setUint32(3, 0xBCDEBCDE);
+  Expect.equals(0xBCDEBCDE, bytes.getUint32(3));
+}
+
+unalignedInt32() {
+  var bytes = new ByteData(64);
+  bytes.setInt32(0, -0x12341234);
+  Expect.equals(-0x12341234, bytes.getInt32(0));
+  bytes.setInt32(1, -0x23452345);
+  Expect.equals(-0x23452345, bytes.getInt32(1));
+  bytes.setInt32(2, -0x12341234);
+  Expect.equals(-0x12341234, bytes.getInt32(2));
+  bytes.setInt32(3, -0x23452345);
+  Expect.equals(-0x23452345, bytes.getInt32(3));
+}
+
+unalignedUint64() {
+  var bytes = new ByteData(64);
+  bytes.setUint64(0, 0xABCDABCD);
+  Expect.equals(0xABCDABCD, bytes.getUint64(0));
+  bytes.setUint64(1, 0xBCDEBCDE);
+  Expect.equals(0xBCDEBCDE, bytes.getUint64(1));
+  bytes.setUint64(2, 0xABCDABCD);
+  Expect.equals(0xABCDABCD, bytes.getUint64(2));
+  bytes.setUint64(3, 0xBCDEBCDE);
+  Expect.equals(0xBCDEBCDE, bytes.getUint64(3));
+  bytes.setUint64(4, 0xABCDABCD);
+  Expect.equals(0xABCDABCD, bytes.getUint64(4));
+  bytes.setUint64(5, 0xBCDEBCDE);
+  Expect.equals(0xBCDEBCDE, bytes.getUint64(5));
+  bytes.setUint64(6, 0xABCDABCD);
+  Expect.equals(0xABCDABCD, bytes.getUint64(6));
+  bytes.setUint64(7, 0xBCDEBCDE);
+  Expect.equals(0xBCDEBCDE, bytes.getUint64(7));
+}
+
+unalignedInt64() {
+  var bytes = new ByteData(64);
+  bytes.setInt64(0, -0x12341234);
+  Expect.equals(-0x12341234, bytes.getInt64(0));
+  bytes.setInt64(1, -0x23452345);
+  Expect.equals(-0x23452345, bytes.getInt64(1));
+  bytes.setInt64(2, -0x12341234);
+  Expect.equals(-0x12341234, bytes.getInt64(2));
+  bytes.setInt64(3, -0x23452345);
+  Expect.equals(-0x23452345, bytes.getInt64(3));
+  bytes.setInt64(4, -0x12341234);
+  Expect.equals(-0x12341234, bytes.getInt64(4));
+  bytes.setInt64(5, -0x23452345);
+  Expect.equals(-0x23452345, bytes.getInt64(5));
+  bytes.setInt64(6, -0x12341234);
+  Expect.equals(-0x12341234, bytes.getInt64(6));
+  bytes.setInt64(7, -0x23452345);
+  Expect.equals(-0x23452345, bytes.getInt64(7));
+}
+
+unalignedFloat32() {
+  var bytes = new ByteData(64);
+  bytes.setFloat32(0, 16.25);
+  Expect.equals(16.25, bytes.getFloat32(0));
+  bytes.setFloat32(1, 32.125);
+  Expect.equals(32.125, bytes.getFloat32(1));
+  bytes.setFloat32(2, 16.25);
+  Expect.equals(16.25, bytes.getFloat32(2));
+  bytes.setFloat32(3, 32.125);
+  Expect.equals(32.125, bytes.getFloat32(3));
+}
+
+unalignedFloat64() {
+  var bytes = new ByteData(64);
+  bytes.setFloat64(0, 16.25);
+  Expect.equals(16.25, bytes.getFloat64(0));
+  bytes.setFloat64(1, 32.125);
+  Expect.equals(32.125, bytes.getFloat64(1));
+  bytes.setFloat64(2, 16.25);
+  Expect.equals(16.25, bytes.getFloat64(2));
+  bytes.setFloat64(3, 32.125);
+  Expect.equals(32.125, bytes.getFloat64(3));
+  bytes.setFloat64(4, 16.25);
+  Expect.equals(16.25, bytes.getFloat64(4));
+  bytes.setFloat64(5, 32.125);
+  Expect.equals(32.125, bytes.getFloat64(5));
+  bytes.setFloat64(6, 16.25);
+  Expect.equals(16.25, bytes.getFloat64(6));
+  bytes.setFloat64(7, 32.125);
+  Expect.equals(32.125, bytes.getFloat64(7));
+}
+
+main() {
+  for (var i = 0; i < 20; i++) {
+    unalignedUint16();
+    unalignedInt16();
+    unalignedUint32();
+    unalignedInt32();
+    unalignedUint64();
+    unalignedInt64();
+    unalignedFloat32();
+    unalignedFloat64();
+  }
+}