[builtins] Introduce proper Float64Tan operator.

src/runtime/runtime-maths.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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/assembler.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
-#include "src/third_party/fdlibm/fdlibm.h"
 
 namespace v8 {
 namespace internal {
 
 RUNTIME_FUNCTION(Runtime_DoubleHi) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
   uint64_t unsigned64 = double_to_uint64(x);
   uint32_t unsigned32 = static_cast<uint32_t>(unsigned64 >> 32);
   int32_t signed32 = bit_cast<int32_t, uint32_t>(unsigned32);
   return *isolate->factory()->NewNumber(signed32);
 }
 
 
 RUNTIME_FUNCTION(Runtime_DoubleLo) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
   uint64_t unsigned64 = double_to_uint64(x);
   uint32_t unsigned32 = static_cast<uint32_t>(unsigned64);
   int32_t signed32 = bit_cast<int32_t, uint32_t>(unsigned32);
   return *isolate->factory()->NewNumber(signed32);
 }
 
 
-RUNTIME_FUNCTION(Runtime_ConstructDouble) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_NUMBER_CHECKED(uint32_t, hi, Uint32, args[0]);
-  CONVERT_NUMBER_CHECKED(uint32_t, lo, Uint32, args[1]);
-  uint64_t result = (static_cast<uint64_t>(hi) << 32) | lo;
-  return *isolate->factory()->NewNumber(uint64_to_double(result));
-}
-
-
-RUNTIME_FUNCTION(Runtime_RemPiO2) {
-  SealHandleScope shs(isolate);
-  DisallowHeapAllocation no_gc;
-  DCHECK(args.length() == 2);
-  CONVERT_DOUBLE_ARG_CHECKED(x, 0);
-  CONVERT_ARG_CHECKED(JSTypedArray, result, 1);
-  CHECK(result->byte_length() == Smi::FromInt(2 * sizeof(double)));
-  FixedFloat64Array* array = FixedFloat64Array::cast(result->elements());
-  double* y = static_cast<double*>(array->DataPtr());
-  return Smi::FromInt(fdlibm::rempio2(x, y));
-}
-
-
 // Slow version of Math.pow.  We check for fast paths for special cases.
 // Used if VFP3 is not available.
 RUNTIME_FUNCTION(Runtime_MathPow) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   isolate->counters()->math_pow_runtime()->Increment();
 
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
 
   // If the second argument is a smi, it is much faster to call the
@@ skipping 79 matching lines @@
     base::RandomNumberGenerator::XorShift128(&state0, &state1);
     array[i] = base::RandomNumberGenerator::ToDouble(state0, state1);
   }
   // Persist current state.
   array[kState0Offset] = uint64_to_double(state0);
   array[kState1Offset] = uint64_to_double(state1);
   return *typed_array;
 }
 }  // namespace internal
 }  // namespace v8