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