Reland "Implement trigonometric functions using a fdlibm port."

tools/generate-trig-table.py

-#!/usr/bin/env python
-#
-# Copyright 2013 the V8 project authors. All rights reserved.
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-#       notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-#       copyright notice, this list of conditions and the following
-#       disclaimer in the documentation and/or other materials provided
-#       with the distribution.
-#     * Neither the name of Google Inc. nor the names of its
-#       contributors may be used to endorse or promote products derived
-#       from this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-# This is a utility for populating the lookup table for the
-# approximation of trigonometric functions.
-
-import sys, math
-
-SAMPLES = 1800
-
-TEMPLATE = """\
-// Copyright 2013 Google Inc. All Rights Reserved.
-
-// This file was generated from a python script.
-
-#include "src/v8.h"
-#include "src/trig-table.h"
-
-namespace v8 {
-namespace internal {
-
-  const double TrigonometricLookupTable::kSinTable[] =
-      { %(sine_table)s };
-  const double TrigonometricLookupTable::kCosXIntervalTable[] =
-      { %(cosine_table)s };
-  const int TrigonometricLookupTable::kSamples = %(samples)i;
-  const int TrigonometricLookupTable::kTableSize = %(table_size)i;
-  const double TrigonometricLookupTable::kSamplesOverPiHalf =
-      %(samples_over_pi_half)s;
-
-} }  // v8::internal
-"""
-
-def main():
-  pi_half = math.pi / 2
-  interval = pi_half / SAMPLES
-  sin = []
-  cos_times_interval = []
-  table_size = SAMPLES + 2
-
-  for i in range(0, table_size):
-    sample = i * interval
-    sin.append(repr(math.sin(sample)))
-    cos_times_interval.append(repr(math.cos(sample) * interval))
-
-  output_file = sys.argv[1]
-  output = open(str(output_file), "w")
-  output.write(TEMPLATE % {
-    'sine_table': ','.join(sin),
-    'cosine_table': ','.join(cos_times_interval),
-    'samples': SAMPLES,
-    'table_size': table_size,
-    'samples_over_pi_half': repr(SAMPLES / pi_half)
-  })
-
-if __name__ == "__main__":
-  main()