[turbofan] Unify Math.floor / Math.ceil optimization.

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/codegen.h"
@@ skipping 4793 matching lines @@
                            -two_52,
                            -two_52 - 0.1,
                            -two_52 - 0.5,
                            -two_52 - 0.7,
                            -two_52 + 1,
                            -two_52 + 1 - 0.1,
                            -two_52 + 1 - 0.5,
                            -two_52 + 1 - 0.7};
 
 
-TEST(RunFloat64Floor) {
+TEST(RunFloat64RoundDown1) {
   double input = -1.0;
   double result = 0.0;
   RawMachineAssemblerTester<int32_t> m;
-  if (!m.machine()->HasFloat64Floor()) return;
+  if (!m.machine()->HasFloat64RoundDown()) return;
   m.StoreToPointer(&result, kMachFloat64,
-                   m.Float64Floor(m.LoadFromPointer(&input, kMachFloat64)));
+                   m.Float64RoundDown(m.LoadFromPointer(&input, kMachFloat64)));
   m.Return(m.Int32Constant(0));
   for (size_t i = 0; i < arraysize(kValues); ++i) {
     input = kValues[i];
     CHECK_EQ(0, m.Call());
     double expected = std::floor(kValues[i]);
     CHECK_EQ(expected, result);
   }
 }
 
 
-TEST(RunFloat64Ceil) {
+TEST(RunFloat64RoundDown2) {
   double input = -1.0;
   double result = 0.0;
   RawMachineAssemblerTester<int32_t> m;
-  if (!m.machine()->HasFloat64Ceil()) return;
+  if (!m.machine()->HasFloat64RoundDown()) return;
   m.StoreToPointer(&result, kMachFloat64,
-                   m.Float64Ceil(m.LoadFromPointer(&input, kMachFloat64)));
+                   m.Float64Sub(m.Float64Constant(-0.0),
+                                m.Float64RoundDown(m.Float64Sub(
+                                    m.Float64Constant(-0.0),
+                                    m.LoadFromPointer(&input, kMachFloat64)))));
   m.Return(m.Int32Constant(0));
   for (size_t i = 0; i < arraysize(kValues); ++i) {
     input = kValues[i];
     CHECK_EQ(0, m.Call());
     double expected = std::ceil(kValues[i]);
     CHECK_EQ(expected, result);
   }
 }
 
 
 TEST(RunFloat64RoundTruncate) {
   double input = -1.0;
   double result = 0.0;
   RawMachineAssemblerTester<int32_t> m;
-  if (!m.machine()->HasFloat64Ceil()) return;
+  if (!m.machine()->HasFloat64RoundTruncate()) return;
   m.StoreToPointer(
       &result, kMachFloat64,
       m.Float64RoundTruncate(m.LoadFromPointer(&input, kMachFloat64)));
   m.Return(m.Int32Constant(0));
   for (size_t i = 0; i < arraysize(kValues); ++i) {
     input = kValues[i];
     CHECK_EQ(0, m.Call());
     double expected = trunc(kValues[i]);
     CHECK_EQ(expected, result);
   }
@@ skipping 11 matching lines @@
   m.Return(m.Int32Constant(0));
   for (size_t i = 0; i < arraysize(kValues); ++i) {
     input = kValues[i];
     CHECK_EQ(0, m.Call());
     double expected = round(kValues[i]);
     CHECK_EQ(expected, result);
   }
 }
 
 #endif  // V8_TURBOFAN_TARGET