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