[turbofan] Generalize constant propagation.

test/unittests/compiler/js-typed-lowering-unittest.cc

Index: test/unittests/compiler/js-typed-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-typed-lowering-unittest.cc b/test/unittests/compiler/js-typed-lowering-unittest.cc
index f0e141a4afe79cc0c6b65bbdac13742d5c821849..97ff106329770269274b74bfeef435ed7e63e0a3 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -14,6 +14,7 @@
 #include "testing/gmock-support.h"
 
 using testing::BitEq;
+using testing::IsNaN;
 
 
 namespace v8 {
@@ -28,9 +29,35 @@ const ExternalArrayType kExternalArrayTypes[] = {
     kExternalFloat32Array, kExternalFloat64Array};
 
 
+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};
+
+
 const size_t kIndices[] = {0, 1, 42, 100, 1024};
 
 
+const double kIntegerValues[] = {-V8_INFINITY, INT_MIN, -1000.0,  -42.0,
+                                 -1.0,         0.0,     1.0,      42.0,
+                                 1000.0,       INT_MAX, UINT_MAX, V8_INFINITY};
+
+
 Type* const kJSTypes[] = {Type::Undefined(), Type::Null(),   Type::Boolean(),
                           Type::Number(),    Type::String(), Type::Object()};
 
@@ -153,6 +180,105 @@ TEST_F(JSTypedLoweringTest, JSUnaryNotWithAny) {
 
 
 // -----------------------------------------------------------------------------
+// Constant propagation
+
+
+TEST_F(JSTypedLoweringTest, ParameterWithMinusZero) {
+  {
+    Reduction r = Reduce(
+        Parameter(Type::Constant(factory()->minus_zero_value(), zone())));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberConstant(-0.0));
+  }
+  {
+    Reduction r = Reduce(Parameter(Type::MinusZero()));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberConstant(-0.0));
+  }
+  {
+    Reduction r = Reduce(Parameter(
+        Type::Union(Type::MinusZero(),
+                    Type::Constant(factory()->NewNumber(0), zone()), zone())));
+    EXPECT_FALSE(r.Changed());
+  }
+}
+
+
+TEST_F(JSTypedLoweringTest, ParameterWithNull) {
+  Handle<HeapObject> null = factory()->null_value();
+  {
+    Reduction r = Reduce(Parameter(Type::Constant(null, zone())));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(),
+                IsHeapConstant(Unique<HeapObject>::CreateImmovable(null)));
+  }
+  {
+    Reduction r = Reduce(Parameter(Type::Null()));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(),
+                IsHeapConstant(Unique<HeapObject>::CreateImmovable(null)));
+  }
+}
+
+
+TEST_F(JSTypedLoweringTest, ParameterWithNaN) {
+  const double kNaNs[] = {base::OS::nan_value(),
+                          std::numeric_limits<double>::quiet_NaN(),
+                          std::numeric_limits<double>::signaling_NaN()};
+  TRACED_FOREACH(double, nan, kNaNs) {
+    Handle<Object> constant = factory()->NewNumber(nan);
+    Reduction r = Reduce(Parameter(Type::Constant(constant, zone())));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberConstant(IsNaN()));
+  }
+  {
+    Reduction r =
+        Reduce(Parameter(Type::Constant(factory()->nan_value(), zone())));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberConstant(IsNaN()));
+  }
+  {
+    Reduction r = Reduce(Parameter(Type::NaN()));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberConstant(IsNaN()));
+  }
+}
+
+
+TEST_F(JSTypedLoweringTest, ParameterWithPlainNumber) {
+  TRACED_FOREACH(double, value, kFloat64Values) {
+    Handle<Object> constant = factory()->NewNumber(value);
+    Reduction r = Reduce(Parameter(Type::Constant(constant, zone())));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberConstant(value));
+  }
+  TRACED_FOREACH(double, value, kIntegerValues) {
+    Handle<Object> constant = factory()->NewNumber(value);
+    Reduction r = Reduce(Parameter(Type::Range(constant, constant, zone())));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberConstant(value));
+  }
+}
+
+
+TEST_F(JSTypedLoweringTest, ParameterWithUndefined) {
+  Handle<HeapObject> undefined = factory()->undefined_value();
+  {
+    Reduction r = Reduce(Parameter(Type::Undefined()));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(),
+                IsHeapConstant(Unique<HeapObject>::CreateImmovable(undefined)));
+  }
+  {
+    Reduction r = Reduce(Parameter(Type::Constant(undefined, zone())));
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(),
+                IsHeapConstant(Unique<HeapObject>::CreateImmovable(undefined)));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
 // JSToBoolean