Add issue numbers to language tests status files

tests/language/load_to_load_forwarding_vm_test.dart

-// Copyright (c) 2012, 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.
-// Test correctness of side effects tracking used by load to load forwarding.
-
-// VMOptions=--optimization-counter-threshold=10
-
-import "package:expect/expect.dart";
-import "dart:typed_data";
-
-class A {
-  var x, y;
-  A(this.x, this.y);
-}
-
-foo(a) {
-  var value1 = a.x;
-  var value2 = a.y;
-  for (var j = 1; j < 4; j++) {
-    value1 |= a.x << (j * 8);
-    a.y += 1;
-    a.x += 1;
-    value2 |= a.y << (j * 8);
-  }
-  return [value1, value2];
-}
-
-bar(a, mode) {
-  var value1 = a.x;
-  var value2 = a.y;
-  for (var j = 1; j < 4; j++) {
-    value1 |= a.x << (j * 8);
-    a.y += 1;
-    if (mode) a.x += 1;
-    a.x += 1;
-    value2 |= a.y << (j * 8);
-  }
-  return [value1, value2];
-}
-
-// Verify that immutable and mutable VM fields (array length in this case)
-// are not confused by load forwarding even if the access the same offset
-// in the object.
-testImmutableVMFields(arr, immutable) {
-  if (immutable) {
-    return arr.length;  // Immutable length load.
-  }
-
-  if (arr.length < 2) {  // Mutable length load, should not be forwarded.
-    arr.add(null);
-  }
-
-  return arr.length;
-}
-
-testPhiRepresentation(f, arr) {
-  if (f) {
-    arr[0] = arr[0] + arr[1];
-  } else {
-    arr[0] = arr[0] - arr[1];
-  }
-  return arr[0];
-}
-
-testPhiConvertions(f, arr) {
-  if (f) {
-    arr[0] = arr[1];
-  } else {
-    arr[0] = arr[2];
-  }
-  return arr[0];
-}
-
-class M {
-  var x;
-  M(this.x);
-}
-
-fakeAliasing(arr) {
-  var a = new M(10);
-  var b = new M(10);
-  var c = arr.length;
-
-  if (c * c != c * c) {
-    arr[0] = a;  // Escape.
-    arr[0] = b;
-  }
-
-  return c * c;  // Deopt point.
-}
-
-class X {
-  var next;
-  X(this.next);
-}
-
-testPhiForwarding(obj) {
-  if (obj.next == null) {
-    return 1;
-  }
-
-  var len = 0;
-  while (obj != null) {
-    len++;
-    obj = obj.next;  // This load should not be forwarded.
-  }
-
-  return len;
-}
-
-testPhiForwarding2(obj) {
-  if (obj.next == null) {
-    return 1;
-  }
-
-  var len = 0, next = null;
-  while ((obj != null) && len < 2) {
-    len++;
-    obj = obj.next;  // This load should be forwarded.
-    next = obj.next;
-  }
-
-  return len;
-}
-
-class V {
-  final f;
-  V(this.f);
-}
-
-testPhiForwarding3() {
-  var a = new V(-0.1);
-  var c = new V(0.0);
-  var b = new V(0.1);
-
-  for (var i = 0; i < 3; i++) {
-    var af = a.f;
-    var bf = b.f;
-    var cf = c.f;
-    a = new V(cf);
-    b = new V(af);
-    c = new V(bf);
-  }
-
-  Expect.equals(-0.1, a.f);
-  Expect.equals(0.1, b.f);
-  Expect.equals(0.0, c.f);
-}
-
-testPhiForwarding4() {
-  var a = new V(-0.1);
-  var b = new V(0.1);
-  var c = new V(0.0);
-
-  var result = new List(9);
-  for (var i = 0, j = 0; i < 3; i++) {
-    result[j++] = a.f;
-    result[j++] = b.f;
-    result[j++] = c.f;
-    var xa = a;
-    var xb = b;
-    a = c;
-    b = xa;
-    c = xb;
-  }
-
-  Expect.listEquals([-0.1, 0.1, 0.0,
-                     0.0, -0.1, 0.1,
-                     0.1, 0.0, -0.1], result);
-}
-
-class U {
-  var x, y;
-  U() : x = 0, y = 0;
-}
-
-testEqualPhisElimination() {
-  var u = new U();
-  var v = new U();
-  var sum = 0;
-  for (var i = 0; i < 3; i++) {
-    u.x = i;
-    u.y = i;
-    if ((i & 1) == 1) {
-      v.x = i + 1;
-      v.y = i + 1;
-    } else {
-      v.x = i - 1;
-      v.y = i - 1;
-    }
-    sum += v.x + v.y;
-  }
-  Expect.equals(4, sum);
-  Expect.equals(2, u.x);
-  Expect.equals(2, u.y);
-}
-
-main() {
-  final fixed = new List(10);
-  final growable = [];
-  testImmutableVMFields(fixed, true);
-  testImmutableVMFields(growable, false);
-  testImmutableVMFields(growable, false);
-
-  final f64List = new Float64List(2);
-  testPhiRepresentation(true, f64List);
-  testPhiRepresentation(false, f64List);
-
-  final obj = new X(new X(new X(null)));
-
-  for (var i = 0; i < 20; i++) {
-    Expect.listEquals([0x02010000, 0x03020100], foo(new A(0, 0)));
-    Expect.listEquals([0x02010000, 0x03020100], bar(new A(0, 0), false));
-    Expect.listEquals([0x04020000, 0x03020100], bar(new A(0, 0), true));
-    testImmutableVMFields(fixed, true);
-    testPhiRepresentation(true, f64List);
-    testPhiForwarding(obj);
-    testPhiForwarding2(obj);
-    testPhiForwarding3();
-    testPhiForwarding4();
-    testEqualPhisElimination();
-  }
-
-  Expect.equals(1, testImmutableVMFields([], false));
-  Expect.equals(2, testImmutableVMFields([1], false));
-  Expect.equals(2, testImmutableVMFields([1, 2], false));
-  Expect.equals(3, testImmutableVMFields([1, 2, 3], false));
-
-  final u32List = new Uint32List(3);
-  u32List[0] = 0;
-  u32List[1] = 0x3FFFFFFF;
-  u32List[2] = 0x7FFFFFFF;
-
-  for (var i = 0; i < 20; i++) {
-    testPhiConvertions(true, u32List);
-    testPhiConvertions(false, u32List);
-  }
-
-  final escape = new List(1);
-  for (var i = 0; i < 20; i++) {
-    fakeAliasing(escape);
-  }
-}