1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
#
# Copyright (C) 2018 Alyssa Rosenzweig
#
# 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 argparse
import sys
import math
a = 'a'
b = 'b'
c = 'c'
algebraic_late = [
# ineg must be lowered late, but only for integers; floats will try to
# have modifiers attached... hence why this has to be here rather than
# a more standard lower_negate approach
(('ineg', a), ('isub', 0, a)),
# These two special-cases save space/an op than the actual csel op +
# scheduler flexibility
(('b32csel', a, 'b@32', 0), ('iand', a, b)),
(('b32csel', a, 0, 'b@32'), ('iand', ('inot', a), b)),
]
# Midgard is able to type convert down by only one "step" per instruction; if
# NIR wants more than one step, we need to break up into multiple instructions
converts = []
for op in ('u2u', 'i2i', 'f2f', 'i2f', 'u2f', 'f2i', 'f2u'):
srcsz_max = 64
dstsz_max = 64
# 8 bit float doesn't exist
srcsz_min = 8 if op[0] != 'f' else 16
dstsz_min = 8 if op[2] != 'f' else 16
dstsz = dstsz_min
# Iterate over all possible destination and source sizes
while dstsz <= dstsz_max:
srcsz = srcsz_min
while srcsz <= srcsz_max:
# Size converter lowering is only needed if src and dst sizes are
# spaced by a factor > 2.
# Type converter lowering is needed as soon as src_size != dst_size
if srcsz != dstsz and ((srcsz * 2 != dstsz and srcsz != dstsz * 2) or op[0] != op[2]):
cursz = srcsz
rule = a
# When converting down we first do the type conversion followed
# by one or more size conversions. When converting up, we do
# the type conversion at the end. This way we don't have to
# deal with the fact that f2f8 doesn't exists.
sizeconvop = op[0] + '2' + op[0] if srcsz < dstsz else op[2] + '2' + op[2]
if srcsz > dstsz and op[0] != op[2]:
rule = (op + str(int(cursz)), rule)
while cursz != dstsz:
cursz = cursz / 2 if dstsz < srcsz else cursz * 2
rule = (sizeconvop + str(int(cursz)), rule)
if srcsz < dstsz and op[0] != op[2]:
rule = (op + str(int(cursz)), rule)
converts += [((op + str(int(dstsz)), 'a@' + str(int(srcsz))), rule)]
srcsz *= 2
dstsz *= 2
# Midgard outputs fp32 for specials. The f2f32 will be folded in later.
SPECIAL = ['fexp2', 'flog2', 'fsin', 'fcos', 'frcp', 'frsq']
for op in SPECIAL:
converts += [((op + '@16', a), ('f2f16', (op, ('f2f32', a))))]
# Midgard scales fsin/fcos arguments by pi.
# Pass must be run only once, after the main loop
scale_trig = [
(('fsin', a), ('fsin', ('fdiv', a, math.pi))),
(('fcos', a), ('fcos', ('fdiv', a, math.pi))),
]
def main():
parser = argparse.ArgumentParser()
parser.add_argument('-p', '--import-path', required=True)
args = parser.parse_args()
sys.path.insert(0, args.import_path)
run()
def run():
import nir_algebraic # pylint: disable=import-error
print('#include "midgard_nir.h"')
print(nir_algebraic.AlgebraicPass("midgard_nir_lower_algebraic_late",
algebraic_late + converts).render())
print(nir_algebraic.AlgebraicPass("midgard_nir_scale_trig",
scale_trig).render())
if __name__ == '__main__':
main()
|
