Revision: 23293
Author:   [email protected]
Date:     Fri Aug 22 07:54:09 2014 UTC
Log: [turbofan] Add support for change/truncate to MachineOperatorReducer.

TEST=compiler-unittests
[email protected]

Review URL: https://codereview.chromium.org/470633006
https://code.google.com/p/v8/source/detail?r=23293

Modified:
 /branches/bleeding_edge/src/compiler/machine-operator-reducer.cc
 /branches/bleeding_edge/src/compiler/machine-operator-reducer.h
 /branches/bleeding_edge/test/compiler-unittests/graph-unittest.cc
 /branches/bleeding_edge/test/compiler-unittests/graph-unittest.h
/branches/bleeding_edge/test/compiler-unittests/machine-operator-reducer-unittest.cc

=======================================
--- /branches/bleeding_edge/src/compiler/machine-operator-reducer.cc Thu Aug 14 09:07:58 2014 UTC +++ /branches/bleeding_edge/src/compiler/machine-operator-reducer.cc Fri Aug 22 07:54:09 2014 UTC
@@ -29,22 +29,27 @@
       machine_(graph->zone()) {}


-Node* MachineOperatorReducer::Int32Constant(int32_t value) {
-  Node** loc = cache_->FindInt32Constant(value);
+Node* MachineOperatorReducer::Float64Constant(volatile double value) {
+  Node** loc = cache_->FindFloat64Constant(value);
   if (*loc == NULL) {
-    *loc = graph_->NewNode(common_.Int32Constant(value));
+    *loc = graph_->NewNode(common_.Float64Constant(value));
   }
   return *loc;
 }


-Node* MachineOperatorReducer::Float64Constant(volatile double value) {
-  Node** loc = cache_->FindFloat64Constant(value);
+Node* MachineOperatorReducer::Int32Constant(int32_t value) {
+  Node** loc = cache_->FindInt32Constant(value);
   if (*loc == NULL) {
-    *loc = graph_->NewNode(common_.Float64Constant(value));
+    *loc = graph_->NewNode(common_.Int32Constant(value));
   }
   return *loc;
 }
+
+
+Node* MachineOperatorReducer::Int64Constant(int64_t value) {
+  return graph_->NewNode(common_.Int64Constant(value));
+}


 // Perform constant folding and strength reduction on machine operators.
@@ -392,6 +397,50 @@
       }
       break;
     }
+    case IrOpcode::kChangeFloat64ToInt32: {
+      Float64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt32(FastD2I(m.Value()));
+      if (m.IsChangeInt32ToFloat64()) return Replace(m.node()->InputAt(0));
+      break;
+    }
+    case IrOpcode::kChangeFloat64ToUint32: {
+      Float64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt32(FastD2UI(m.Value()));
+ if (m.IsChangeUint32ToFloat64()) return Replace(m.node()->InputAt(0));
+      break;
+    }
+    case IrOpcode::kChangeInt32ToFloat64: {
+      Int32Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceFloat64(FastI2D(m.Value()));
+      break;
+    }
+    case IrOpcode::kChangeInt32ToInt64: {
+      Int32Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt64(m.Value());
+      break;
+    }
+    case IrOpcode::kChangeUint32ToFloat64: {
+      Uint32Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceFloat64(FastUI2D(m.Value()));
+      break;
+    }
+    case IrOpcode::kChangeUint32ToUint64: {
+      Uint32Matcher m(node->InputAt(0));
+ if (m.HasValue()) return ReplaceInt64(static_cast<uint64_t>(m.Value()));
+      break;
+    }
+    case IrOpcode::kTruncateFloat64ToInt32: {
+      Float64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt32(DoubleToInt32(m.Value()));
+      if (m.IsChangeInt32ToFloat64()) return Replace(m.node()->InputAt(0));
+      break;
+    }
+    case IrOpcode::kTruncateInt64ToInt32: {
+      Int64Matcher m(node->InputAt(0));
+ if (m.HasValue()) return ReplaceInt32(static_cast<int32_t>(m.Value()));
+      if (m.IsChangeInt32ToInt64()) return Replace(m.node()->InputAt(0));
+      break;
+    }
     // TODO(turbofan): strength-reduce and fold floating point operations.
     default:
       break;
=======================================
--- /branches/bleeding_edge/src/compiler/machine-operator-reducer.h Wed Jul 30 13:54:45 2014 UTC +++ /branches/bleeding_edge/src/compiler/machine-operator-reducer.h Fri Aug 22 07:54:09 2014 UTC
@@ -32,17 +32,19 @@
   CommonOperatorBuilder common_;
   MachineOperatorBuilder machine_;

+  Node* Float64Constant(volatile double value);
   Node* Int32Constant(int32_t value);
-  Node* Float64Constant(volatile double value);
+  Node* Int64Constant(int64_t value);

   Reduction ReplaceBool(bool value) { return ReplaceInt32(value ? 1 : 0); }
-
+  Reduction ReplaceFloat64(volatile double value) {
+    return Replace(Float64Constant(value));
+  }
   Reduction ReplaceInt32(int32_t value) {
     return Replace(Int32Constant(value));
   }
-
-  Reduction ReplaceFloat64(volatile double value) {
-    return Replace(Float64Constant(value));
+  Reduction ReplaceInt64(int64_t value) {
+    return Replace(Int64Constant(value));
   }
 };
 }
=======================================
--- /branches/bleeding_edge/test/compiler-unittests/graph-unittest.cc Fri Aug 22 04:47:55 2014 UTC +++ /branches/bleeding_edge/test/compiler-unittests/graph-unittest.cc Fri Aug 22 07:54:09 2014 UTC
@@ -53,6 +53,11 @@
 Node* GraphTest::Int32Constant(int32_t value) {
   return graph()->NewNode(common()->Int32Constant(value));
 }
+
+
+Node* GraphTest::Int64Constant(int64_t value) {
+  return graph()->NewNode(common()->Int64Constant(value));
+}


 Node* GraphTest::NumberConstant(double value) {
@@ -645,6 +650,12 @@
   return MakeMatcher(
new IsConstantMatcher<int32_t>(IrOpcode::kInt32Constant, value_matcher));
 }
+
+
+Matcher<Node*> IsInt64Constant(const Matcher<int64_t>& value_matcher) {
+  return MakeMatcher(
+ new IsConstantMatcher<int64_t>(IrOpcode::kInt64Constant, value_matcher));
+}


 Matcher<Node*> IsFloat64Constant(const Matcher<double>& value_matcher) {
=======================================
--- /branches/bleeding_edge/test/compiler-unittests/graph-unittest.h Fri Aug 22 04:47:55 2014 UTC +++ /branches/bleeding_edge/test/compiler-unittests/graph-unittest.h Fri Aug 22 07:54:09 2014 UTC
@@ -32,6 +32,7 @@
   Node* Parameter(int32_t index);
   Node* Float64Constant(double value);
   Node* Int32Constant(int32_t value);
+  Node* Int64Constant(int64_t value);
   Node* NumberConstant(double value);
   Node* HeapConstant(const PrintableUnique<HeapObject>& value);
   Node* FalseConstant();
@@ -63,6 +64,7 @@
     const Matcher<PrintableUnique<HeapObject> >& value_matcher);
 Matcher<Node*> IsFloat64Constant(const Matcher<double>& value_matcher);
 Matcher<Node*> IsInt32Constant(const Matcher<int32_t>& value_matcher);
+Matcher<Node*> IsInt64Constant(const Matcher<int64_t>& value_matcher);
 Matcher<Node*> IsNumberConstant(const Matcher<double>& value_matcher);
 Matcher<Node*> IsPhi(const Matcher<Node*>& value0_matcher,
                      const Matcher<Node*>& value1_matcher,
=======================================
--- /branches/bleeding_edge/test/compiler-unittests/machine-operator-reducer-unittest.cc Fri Aug 22 04:47:55 2014 UTC +++ /branches/bleeding_edge/test/compiler-unittests/machine-operator-reducer-unittest.cc Fri Aug 22 07:54:09 2014 UTC
@@ -29,9 +29,119 @@
 };


+template <typename T>
+class MachineOperatorReducerTestWithParam
+    : public MachineOperatorReducerTest,
+      public ::testing::WithParamInterface<T> {
+ public:
+  explicit MachineOperatorReducerTestWithParam(int num_parameters = 2)
+      : MachineOperatorReducerTest(num_parameters) {}
+  virtual ~MachineOperatorReducerTestWithParam() {}
+};
+
+
 namespace {

-static const uint32_t kConstants[] = {
+static const double kFloat64Values[] = {
+ -V8_INFINITY, -4.23878e+275, -5.82632e+265, -6.60355e+220, -6.26172e+212, + -2.56222e+211, -4.82408e+201, -1.84106e+157, -1.63662e+127, -1.55772e+100, + -1.67813e+72, -2.3382e+55, -3.179e+30, -1.441e+09, -1.0647e+09,
+    -7.99361e+08,  -5.77375e+08,  -2.20984e+08,  -32757,        -13171,
+    -9970,         -3984,         -107,          -105,          -92,
+ -77, -61, -0.000208163, -1.86685e-06, -1.17296e-10, + -9.26358e-11, -5.08004e-60, -1.74753e-65, -1.06561e-71, -5.67879e-79, + -5.78459e-130, -2.90989e-171, -7.15489e-243, -3.76242e-252, -1.05639e-263, + -4.40497e-267, -2.19666e-273, -4.9998e-276, -5.59821e-278, -2.03855e-282,
+    -5.99335e-283, -7.17554e-284, -3.11744e-309, -0.0,          0.0,
+ 2.22507e-308, 1.30127e-270, 7.62898e-260, 4.00313e-249, 3.16829e-233, + 1.85244e-228, 2.03544e-129, 1.35126e-110, 1.01182e-106, 5.26333e-94, + 1.35292e-90, 2.85394e-83, 1.78323e-77, 5.4967e-57, 1.03207e-25,
+    4.57401e-25,   1.58738e-05,   2,             125,           2310,
+    9636,          14802,         17168,         28945,         29305,
+ 4.81336e+07, 1.41207e+08, 4.65962e+08, 1.40499e+09, 2.12648e+09, + 8.80006e+30, 1.4446e+45, 1.12164e+54, 2.48188e+89, 6.71121e+102, + 3.074e+112, 4.9699e+152, 5.58383e+166, 4.30654e+172, 7.08824e+185, + 9.6586e+214, 2.028e+223, 6.63277e+243, 1.56192e+261, 1.23202e+269, + 5.72883e+289, 8.5798e+290, 1.40256e+294, 1.79769e+308, V8_INFINITY};
+
+
+static const int32_t kInt32Values[] = {
+    -2147483647 - 1, -1914954528, -1698749618, -1578693386, -1577976073,
+    -1573998034,     -1529085059, -1499540537, -1299205097, -1090814845,
+    -938186388,      -806828902,  -750927650,  -520676892,  -513661538,
+    -453036354,      -433622833,  -282638793,  -28375,      -27788,
+    -22770,          -18806,      -14173,      -11956,      -11200,
+    -10212,          -8160,       -3751,       -2758,       -1522,
+    -121,            -120,        -118,        -117,        -106,
+    -84,             -80,         -74,         -59,         -52,
+    -48,             -39,         -35,         -17,         -11,
+    -10,             -9,          -7,          -5,          0,
+    9,               12,          17,          23,          29,
+    31,              33,          35,          40,          47,
+    55,              56,          62,          64,          67,
+    68,              69,          74,          79,          84,
+    89,              90,          97,          104,         118,
+    124,             126,         127,         7278,        17787,
+    24136,           24202,       25570,       26680,       30242,
+    32399,           420886487,   642166225,   821912648,   822577803,
+    851385718,       1212241078,  1411419304,  1589626102,  1596437184,
+    1876245816,      1954730266,  2008792749,  2045320228,  2147483647};
+
+
+static const int64_t kInt64Values[] = {
+    V8_INT64_C(-9223372036854775807) - 1, V8_INT64_C(-8974392461363618006),
+    V8_INT64_C(-8874367046689588135),     V8_INT64_C(-8269197512118230839),
+    V8_INT64_C(-8146091527100606733),     V8_INT64_C(-7550917981466150848),
+    V8_INT64_C(-7216590251577894337),     V8_INT64_C(-6464086891160048440),
+    V8_INT64_C(-6365616494908257190),     V8_INT64_C(-6305630541365849726),
+    V8_INT64_C(-5982222642272245453),     V8_INT64_C(-5510103099058504169),
+    V8_INT64_C(-5496838675802432701),     V8_INT64_C(-4047626578868642657),
+    V8_INT64_C(-4033755046900164544),     V8_INT64_C(-3554299241457877041),
+    V8_INT64_C(-2482258764588614470),     V8_INT64_C(-1688515425526875335),
+    V8_INT64_C(-924784137176548532),      V8_INT64_C(-725316567157391307),
+    V8_INT64_C(-439022654781092241),      V8_INT64_C(-105545757668917080),
+    V8_INT64_C(-2088319373),              V8_INT64_C(-2073699916),
+    V8_INT64_C(-1844949911),              V8_INT64_C(-1831090548),
+    V8_INT64_C(-1756711933),              V8_INT64_C(-1559409497),
+    V8_INT64_C(-1281179700),              V8_INT64_C(-1211513985),
+    V8_INT64_C(-1182371520),              V8_INT64_C(-785934753),
+    V8_INT64_C(-767480697),               V8_INT64_C(-705745662),
+    V8_INT64_C(-514362436),               V8_INT64_C(-459916580),
+    V8_INT64_C(-312328082),               V8_INT64_C(-302949707),
+    V8_INT64_C(-285499304),               V8_INT64_C(-125701262),
+    V8_INT64_C(-95139843),                V8_INT64_C(-32768),
+    V8_INT64_C(-27542),                   V8_INT64_C(-23600),
+    V8_INT64_C(-18582),                   V8_INT64_C(-17770),
+    V8_INT64_C(-9086),                    V8_INT64_C(-9010),
+    V8_INT64_C(-8244),                    V8_INT64_C(-2890),
+    V8_INT64_C(-103),                     V8_INT64_C(-34),
+    V8_INT64_C(-27),                      V8_INT64_C(-25),
+    V8_INT64_C(-9),                       V8_INT64_C(-7),
+    V8_INT64_C(0),                        V8_INT64_C(2),
+    V8_INT64_C(38),                       V8_INT64_C(58),
+    V8_INT64_C(65),                       V8_INT64_C(93),
+    V8_INT64_C(111),                      V8_INT64_C(1003),
+    V8_INT64_C(1267),                     V8_INT64_C(12797),
+    V8_INT64_C(23122),                    V8_INT64_C(28200),
+    V8_INT64_C(30888),                    V8_INT64_C(42648848),
+    V8_INT64_C(116836693),                V8_INT64_C(263003643),
+    V8_INT64_C(571039860),                V8_INT64_C(1079398689),
+    V8_INT64_C(1145196402),               V8_INT64_C(1184846321),
+    V8_INT64_C(1758281648),               V8_INT64_C(1859991374),
+    V8_INT64_C(1960251588),               V8_INT64_C(2042443199),
+    V8_INT64_C(296220586027987448),       V8_INT64_C(1015494173071134726),
+    V8_INT64_C(1151237951914455318),      V8_INT64_C(1331941174616854174),
+    V8_INT64_C(2022020418667972654),      V8_INT64_C(2450251424374977035),
+    V8_INT64_C(3668393562685561486),      V8_INT64_C(4858229301215502171),
+    V8_INT64_C(4919426235170669383),      V8_INT64_C(5034286595330341762),
+    V8_INT64_C(5055797915536941182),      V8_INT64_C(6072389716149252074),
+    V8_INT64_C(6185309910199801210),      V8_INT64_C(6297328311011094138),
+    V8_INT64_C(6932372858072165827),      V8_INT64_C(8483640924987737210),
+    V8_INT64_C(8663764179455849203),      V8_INT64_C(8877197042645298254),
+    V8_INT64_C(8901543506779157333),      V8_INT64_C(9223372036854775807)};
+
+
+static const uint32_t kUint32Values[] = {
     0x00000000, 0x00000001, 0xffffffff, 0x1b09788b, 0x04c5fce8, 0xcc0de5bf,
     0x273a798e, 0x187937a3, 0xece3af83, 0x5495a16b, 0x0b668ecc, 0x11223344,
     0x0000009e, 0x00000043, 0x0000af73, 0x0000116b, 0x00658ecc, 0x002b3b4c,
@@ -44,6 +154,216 @@
 }  // namespace


+// -----------------------------------------------------------------------------
+// Unary operators
+
+
+namespace {
+
+struct UnaryOperator {
+  Operator* (MachineOperatorBuilder::*constructor)();
+  const char* constructor_name;
+};
+
+
+std::ostream& operator<<(std::ostream& os, const UnaryOperator& unop) {
+  return os << unop.constructor_name;
+}
+
+
+static const UnaryOperator kUnaryOperators[] = {
+ {&MachineOperatorBuilder::ChangeInt32ToFloat64, "ChangeInt32ToFloat64"}, + {&MachineOperatorBuilder::ChangeUint32ToFloat64, "ChangeUint32ToFloat64"}, + {&MachineOperatorBuilder::ChangeFloat64ToInt32, "ChangeFloat64ToInt32"}, + {&MachineOperatorBuilder::ChangeFloat64ToUint32, "ChangeFloat64ToUint32"},
+    {&MachineOperatorBuilder::ChangeInt32ToInt64, "ChangeInt32ToInt64"},
+ {&MachineOperatorBuilder::ChangeUint32ToUint64, "ChangeUint32ToUint64"}, + {&MachineOperatorBuilder::TruncateFloat64ToInt32, "TruncateFloat64ToInt32"}, + {&MachineOperatorBuilder::TruncateInt64ToInt32, "TruncateInt64ToInt32"}};
+
+}  // namespace
+
+
+typedef MachineOperatorReducerTestWithParam<UnaryOperator>
+    MachineUnaryOperatorReducerTest;
+
+
+TEST_P(MachineUnaryOperatorReducerTest, Parameter) {
+  const UnaryOperator unop = GetParam();
+  Reduction reduction =
+ Reduce(graph()->NewNode((machine()->*unop.constructor)(), Parameter(0)));
+  EXPECT_FALSE(reduction.Changed());
+}
+
+
+INSTANTIATE_TEST_CASE_P(MachineOperatorReducerTest,
+                        MachineUnaryOperatorReducerTest,
+                        ::testing::ValuesIn(kUnaryOperators));
+
+
+// -----------------------------------------------------------------------------
+// ChangeFloat64ToInt32
+
+
+TEST_F(MachineOperatorReducerTest,
+       ChangeFloat64ToInt32WithChangeInt32ToFloat64) {
+  Node* value = Parameter(0);
+  Reduction reduction = Reduce(graph()->NewNode(
+      machine()->ChangeFloat64ToInt32(),
+      graph()->NewNode(machine()->ChangeInt32ToFloat64(), value)));
+  ASSERT_TRUE(reduction.Changed());
+  EXPECT_EQ(value, reduction.replacement());
+}
+
+
+TEST_F(MachineOperatorReducerTest, ChangeFloat64ToInt32WithConstant) {
+  TRACED_FOREACH(int32_t, x, kInt32Values) {
+    Reduction reduction = Reduce(graph()->NewNode(
+        machine()->ChangeFloat64ToInt32(), Float64Constant(FastI2D(x))));
+    ASSERT_TRUE(reduction.Changed());
+    EXPECT_THAT(reduction.replacement(), IsInt32Constant(x));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
+// ChangeFloat64ToUint32
+
+
+TEST_F(MachineOperatorReducerTest,
+       ChangeFloat64ToUint32WithChangeUint32ToFloat64) {
+  Node* value = Parameter(0);
+  Reduction reduction = Reduce(graph()->NewNode(
+      machine()->ChangeFloat64ToUint32(),
+      graph()->NewNode(machine()->ChangeUint32ToFloat64(), value)));
+  ASSERT_TRUE(reduction.Changed());
+  EXPECT_EQ(value, reduction.replacement());
+}
+
+
+TEST_F(MachineOperatorReducerTest, ChangeFloat64ToUint32WithConstant) {
+  TRACED_FOREACH(uint32_t, x, kUint32Values) {
+    Reduction reduction = Reduce(graph()->NewNode(
+        machine()->ChangeFloat64ToUint32(), Float64Constant(FastUI2D(x))));
+    ASSERT_TRUE(reduction.Changed());
+ EXPECT_THAT(reduction.replacement(), IsInt32Constant(BitCast<int32_t>(x)));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
+// ChangeInt32ToFloat64
+
+
+TEST_F(MachineOperatorReducerTest, ChangeInt32ToFloat64WithConstant) {
+  TRACED_FOREACH(int32_t, x, kInt32Values) {
+    Reduction reduction = Reduce(
+ graph()->NewNode(machine()->ChangeInt32ToFloat64(), Int32Constant(x)));
+    ASSERT_TRUE(reduction.Changed());
+    EXPECT_THAT(reduction.replacement(), IsFloat64Constant(FastI2D(x)));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
+// ChangeInt32ToInt64
+
+
+TEST_F(MachineOperatorReducerTest, ChangeInt32ToInt64WithConstant) {
+  TRACED_FOREACH(int32_t, x, kInt32Values) {
+    Reduction reduction = Reduce(
+ graph()->NewNode(machine()->ChangeInt32ToInt64(), Int32Constant(x)));
+    ASSERT_TRUE(reduction.Changed());
+    EXPECT_THAT(reduction.replacement(), IsInt64Constant(x));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
+// ChangeUint32ToFloat64
+
+
+TEST_F(MachineOperatorReducerTest, ChangeUint32ToFloat64WithConstant) {
+  TRACED_FOREACH(uint32_t, x, kUint32Values) {
+    Reduction reduction =
+        Reduce(graph()->NewNode(machine()->ChangeUint32ToFloat64(),
+                                Int32Constant(BitCast<int32_t>(x))));
+    ASSERT_TRUE(reduction.Changed());
+    EXPECT_THAT(reduction.replacement(), IsFloat64Constant(FastUI2D(x)));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
+// ChangeUint32ToUint64
+
+
+TEST_F(MachineOperatorReducerTest, ChangeUint32ToUint64WithConstant) {
+  TRACED_FOREACH(uint32_t, x, kUint32Values) {
+    Reduction reduction = Reduce(graph()->NewNode(
+ machine()->ChangeUint32ToUint64(), Int32Constant(BitCast<int32_t>(x))));
+    ASSERT_TRUE(reduction.Changed());
+    EXPECT_THAT(reduction.replacement(),
+ IsInt64Constant(BitCast<int64_t>(static_cast<uint64_t>(x))));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
+// TruncateFloat64ToInt32
+
+
+TEST_F(MachineOperatorReducerTest,
+       TruncateFloat64ToInt32WithChangeInt32ToFloat64) {
+  Node* value = Parameter(0);
+  Reduction reduction = Reduce(graph()->NewNode(
+      machine()->TruncateFloat64ToInt32(),
+      graph()->NewNode(machine()->ChangeInt32ToFloat64(), value)));
+  ASSERT_TRUE(reduction.Changed());
+  EXPECT_EQ(value, reduction.replacement());
+}
+
+
+TEST_F(MachineOperatorReducerTest, TruncateFloat64ToInt32WithConstant) {
+  TRACED_FOREACH(double, x, kFloat64Values) {
+    Reduction reduction = Reduce(graph()->NewNode(
+        machine()->TruncateFloat64ToInt32(), Float64Constant(x)));
+    ASSERT_TRUE(reduction.Changed());
+ EXPECT_THAT(reduction.replacement(), IsInt32Constant(DoubleToInt32(x)));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
+// TruncateInt64ToInt32
+
+
+TEST_F(MachineOperatorReducerTest, TruncateInt64ToInt32WithChangeInt32ToInt64) {
+  Node* value = Parameter(0);
+  Reduction reduction = Reduce(graph()->NewNode(
+      machine()->TruncateInt64ToInt32(),
+      graph()->NewNode(machine()->ChangeInt32ToInt64(), value)));
+  ASSERT_TRUE(reduction.Changed());
+  EXPECT_EQ(value, reduction.replacement());
+}
+
+
+TEST_F(MachineOperatorReducerTest, TruncateInt64ToInt32WithConstant) {
+  TRACED_FOREACH(int64_t, x, kInt64Values) {
+    Reduction reduction = Reduce(
+ graph()->NewNode(machine()->TruncateInt64ToInt32(), Int64Constant(x)));
+    ASSERT_TRUE(reduction.Changed());
+    EXPECT_THAT(reduction.replacement(),
+                IsInt32Constant(BitCast<int32_t>(
+                    static_cast<uint32_t>(BitCast<uint64_t>(x)))));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
+// Word32Ror
+
+
 TEST_F(MachineOperatorReducerTest, ReduceToWord32RorWithParameters) {
   Node* value = Parameter(0);
   Node* shift = Parameter(1);
@@ -106,7 +426,7 @@


 TEST_F(MachineOperatorReducerTest, Word32RorWithConstants) {
-  TRACED_FOREACH(int32_t, x, kConstants) {
+  TRACED_FOREACH(int32_t, x, kUint32Values) {
     TRACED_FORRANGE(int32_t, y, 0, 31) {
Node* node = graph()->NewNode(machine()->Word32Ror(), Int32Constant(x),
                                     Int32Constant(y));

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