61 lines
2.4 KiB
Python
61 lines
2.4 KiB
Python
#
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# Copyright (C) 2016 Intel Corporation
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the "Software"),
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# to deal in the Software without restriction, including without limitation
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# the rights to use, copy, modify, merge, publish, distribute, sublicense,
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# and/or sell copies of the Software, and to permit persons to whom the
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# Software is furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice (including the next
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# paragraph) shall be included in all copies or substantial portions of the
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# Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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# Prior to Kaby Lake, The SIN and COS instructions on Intel hardware can
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# produce values slightly outside of the [-1.0, 1.0] range for a small set of
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# values. Obviously, this can break everyone's expectations about trig
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# functions. This appears to be fixed in Kaby Lake.
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#
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# According to an internal presentation, the COS instruction can produce
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# a value up to 1.000027 for inputs in the range (0.08296, 0.09888). One
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# suggested workaround is to multiply by 0.99997, scaling down the
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# amplitude slightly. Apparently this also minimizes the error function,
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# reducing the maximum error from 0.00006 to about 0.00003.
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import argparse
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import sys
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TRIG_WORKAROUNDS = [
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(('fsin', 'x(is_not_const)'), ('fmul', ('fsin', 'x'), 0.99997)),
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(('fcos', 'x(is_not_const)'), ('fmul', ('fcos', 'x'), 0.99997)),
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]
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument('-p', '--import-path', required=True)
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args = parser.parse_args()
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sys.path.insert(0, args.import_path)
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run()
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def run():
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import nir_algebraic # pylint: disable=import-error
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print('#include "brw_nir.h"')
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print(nir_algebraic.AlgebraicPass("brw_nir_apply_trig_workarounds",
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TRIG_WORKAROUNDS).render())
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if __name__ == '__main__':
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main()
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