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