[builtins] Introduce proper Float64Exp operator.

test/cctest/compiler/test-run-machops.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 <cmath>
 #include <functional>
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/base/ieee754.h"
@@ skipping 5499 matching lines @@
   BufferedRawMachineAssemblerTester<double> m(MachineType::Float64(),
                                               MachineType::Float64());
   m.Return(m.Float64Atan2(m.Parameter(0), m.Parameter(1)));
   FOR_FLOAT64_INPUTS(i) {
     FOR_FLOAT64_INPUTS(j) {
       CHECK_DOUBLE_EQ(ieee754::atan2(*i, *j), m.Call(*i, *j));
     }
   }
 }
 
+TEST(RunFloat64Exp) {
+  BufferedRawMachineAssemblerTester<double> m(MachineType::Float64());
+  m.Return(m.Float64Exp(m.Parameter(0)));
+  CHECK(std::isnan(m.Call(std::numeric_limits<double>::quiet_NaN())));
+  CHECK(std::isnan(m.Call(std::numeric_limits<double>::signaling_NaN())));
+  CHECK_EQ(0.0, m.Call(-std::numeric_limits<double>::infinity()));
+  CHECK_DOUBLE_EQ(1.0, m.Call(-0.0));
+  CHECK_DOUBLE_EQ(1.0, m.Call(0.0));
+  CHECK_DOUBLE_EQ(std::numeric_limits<double>::infinity(),
+                  m.Call(std::numeric_limits<double>::infinity()));
+  FOR_FLOAT64_INPUTS(i) { CHECK_DOUBLE_EQ(ieee754::exp(*i), m.Call(*i)); }
+}
+
 TEST(RunFloat64Log) {
   BufferedRawMachineAssemblerTester<double> m(MachineType::Float64());
   m.Return(m.Float64Log(m.Parameter(0)));
   CHECK(std::isnan(m.Call(std::numeric_limits<double>::quiet_NaN())));
   CHECK(std::isnan(m.Call(std::numeric_limits<double>::signaling_NaN())));
   CHECK(std::isnan(m.Call(-std::numeric_limits<double>::infinity())));
   CHECK(std::isnan(m.Call(-1.0)));
   CHECK_DOUBLE_EQ(-std::numeric_limits<double>::infinity(), m.Call(-0.0));
   CHECK_DOUBLE_EQ(-std::numeric_limits<double>::infinity(), m.Call(0.0));
   CHECK_DOUBLE_EQ(0.0, m.Call(1.0));
@@ skipping 807 matching lines @@
   r.Goto(&merge);
   r.Bind(&merge);
   Node* phi = r.Phi(MachineRepresentation::kWord32, fa, fb);
   r.Return(phi);
   CHECK_EQ(1, r.Call(1));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8