| #!/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 "v8.h" |
| #include "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() |