Extend JSBuiltinReducer to cover Math.sqrt as well.

src/compiler/js-builtin-reducer-unittest.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/graph-unittest.h"
 #include "src/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/typer.h"
 #include "testing/gmock-support.h"
@@ skipping 42 matching lines @@
     Type::UnsignedSmall(),   Type::OtherSignedSmall(), Type::OtherUnsigned31(),
     Type::OtherUnsigned32(), Type::OtherSigned32(),    Type::SignedSmall(),
     Type::Signed32(),        Type::Unsigned32(),       Type::Integral32(),
     Type::MinusZero(),       Type::NaN(),              Type::OtherNumber(),
     Type::OrderedNumber(),   Type::Number()};
 
 }  // namespace
 
 
 // -----------------------------------------------------------------------------
+// Math.sqrt
+
+
+TEST_F(JSBuiltinReducerTest, MathSqrt) {
+  Handle<JSFunction> f(isolate()->context()->math_sqrt_fun());
+
+  TRACED_FOREACH(Type*, t0, kNumberTypes) {
+    Node* p0 = Parameter(t0, 0);
+    Node* fun = HeapConstant(Unique<HeapObject>::CreateUninitialized(f));
+    Node* call = graph()->NewNode(javascript()->Call(3, NO_CALL_FUNCTION_FLAGS),
+                                  fun, UndefinedConstant(), p0);
+    Reduction r = Reduce(call);
+
+    EXPECT_TRUE(r.Changed());

[Benedikt Meurer, 2014/09/24 06:34:43]

Nit: use ASSERT_TRUE, doesn't make sense to do the EXPECT_THAT below if it
didn't change.

[Michael Starzinger, 2014/09/24 08:20:51]

Done, here and at all occurrences below.

+    EXPECT_THAT(r.replacement(), IsFloat64Sqrt(p0));
+  }
+}
+
+
+// -----------------------------------------------------------------------------
 // Math.max
 
 
 TEST_F(JSBuiltinReducerTest, MathMax0) {
   Handle<JSFunction> f(isolate()->context()->math_max_fun());
 
   Node* fun = HeapConstant(Unique<HeapObject>::CreateUninitialized(f));
   Node* call = graph()->NewNode(javascript()->Call(2, NO_CALL_FUNCTION_FLAGS),
                                 fun, UndefinedConstant());
   Reduction r = Reduce(call);
@@ skipping 75 matching lines @@
         EXPECT_FALSE(r.Changed());
         EXPECT_EQ(IrOpcode::kJSCallFunction, call->opcode());
       }
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8