3 # Copyright (C) 2014 Intel Corporation
5 # Permission is hereby granted, free of charge, to any person obtaining a
6 # copy of this software and associated documentation files (the "Software"),
7 # to deal in the Software without restriction, including without limitation
8 # the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 # and/or sell copies of the Software, and to permit persons to whom the
10 # Software is furnished to do so, subject to the following conditions:
12 # The above copyright notice and this permission notice (including the next
13 # paragraph) shall be included in all copies or substantial portions of the
16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
25 # Jason Ekstrand (jason@jlekstrand.net)
29 # Convenience variables
35 # Written in the form (<search>, <replace>) where <search> is an expression
36 # and <replace> is either an expression or a value. An expression is
37 # defined as a tuple of the form (<op>, <src0>, <src1>, <src2>, <src3>)
38 # where each source is either an expression or a value. A value can be
39 # either a numeric constant or a string representing a variable name.
41 # Variable names are specified as "[#]name[@type]" where "#" inicates that
42 # the given variable will only match constants and the type indicates that
43 # the given variable will only match values from ALU instructions with the
46 # For constants, you have to be careful to make sure that it is the right
47 # type because python is unaware of the source and destination types of the
51 (('fneg', ('fneg', a
)), a
),
52 (('ineg', ('ineg', a
)), a
),
53 (('fabs', ('fabs', a
)), ('fabs', a
)),
54 (('fabs', ('fneg', a
)), ('fabs', a
)),
55 (('iabs', ('iabs', a
)), ('iabs', a
)),
56 (('iabs', ('ineg', a
)), ('iabs', a
)),
57 (('fadd', a
, 0.0), a
),
59 (('fmul', a
, 0.0), 0.0),
61 (('fmul', a
, 1.0), a
),
63 (('fmul', a
, -1.0), ('fneg', a
)),
64 (('imul', a
, -1), ('ineg', a
)),
65 (('ffma', 0.0, a
, b
), b
),
66 (('ffma', a
, 0.0, b
), b
),
67 (('ffma', a
, b
, 0.0), ('fmul', a
, b
)),
68 (('ffma', a
, 1.0, b
), ('fadd', a
, b
)),
69 (('ffma', 1.0, a
, b
), ('fadd', a
, b
)),
70 (('flrp', a
, b
, 0.0), a
),
71 (('flrp', a
, b
, 1.0), b
),
72 (('flrp', a
, a
, b
), a
),
73 (('flrp', 0.0, a
, b
), ('fmul', a
, b
)),
74 (('fadd', ('fmul', a
, b
), c
), ('ffma', a
, b
, c
)),
75 # Comparison simplifications
76 (('inot', ('flt', a
, b
)), ('fge', a
, b
)),
77 (('inot', ('fge', a
, b
)), ('flt', a
, b
)),
78 (('inot', ('ilt', a
, b
)), ('ige', a
, b
)),
79 (('inot', ('ige', a
, b
)), ('ilt', a
, b
)),
80 (('flt', ('fadd', a
, b
), 0.0), ('flt', a
, ('fneg', b
))),
81 (('fge', ('fadd', a
, b
), 0.0), ('fge', a
, ('fneg', b
))),
82 (('feq', ('fadd', a
, b
), 0.0), ('feq', a
, ('fneg', b
))),
83 (('fne', ('fadd', a
, b
), 0.0), ('fne', a
, ('fneg', b
))),
84 (('fge', ('fneg', ('fabs', a
)), 0.0), ('feq', a
, 0.0)),
85 (('bcsel', ('flt', a
, b
), a
, b
), ('fmin', a
, b
)),
86 (('bcsel', ('flt', a
, b
), b
, a
), ('fmax', a
, b
)),
87 (('fmin', ('fmax', a
, 0.0), 1.0), ('fsat', a
)),
88 # Comparison with the same args. Note that these are not done for
89 # the float versions because NaN always returns false on float
91 (('ilt', a
, a
), False),
92 (('ige', a
, a
), True),
93 (('ieq', a
, a
), True),
94 (('ine', a
, a
), False),
95 (('ult', a
, a
), False),
96 (('uge', a
, a
), True),
97 # Logical and bit operations
98 (('fand', a
, 0.0), 0.0),
103 (('fxor', a
, a
), 0.0),
105 (('inot', ('inot', a
)), a
),
107 (('iand', ('inot', a
), ('inot', b
)), ('inot', ('ior', a
, b
))),
108 (('ior', ('inot', a
), ('inot', b
)), ('inot', ('iand', a
, b
))),
109 # Shift optimizations
116 # Exponential/logarithmic identities
117 (('fexp2', ('flog2', a
)), a
), # 2^lg2(a) = a
118 (('fexp', ('flog', a
)), a
), # e^ln(a) = a
119 (('flog2', ('fexp2', a
)), a
), # lg2(2^a) = a
120 (('flog', ('fexp', a
)), a
), # ln(e^a) = a
121 (('fexp2', ('fmul', ('flog2', a
), b
)), ('fpow', a
, b
)), # 2^(lg2(a)*b) = a^b
122 (('fexp', ('fmul', ('flog', a
), b
)), ('fpow', a
, b
)), # e^(ln(a)*b) = a^b
123 (('fpow', a
, 1.0), a
),
124 (('fpow', a
, 2.0), ('fmul', a
, a
)),
125 (('fpow', 2.0, a
), ('fexp2', a
)),
126 # Division and reciprocal
127 (('fdiv', 1.0, a
), ('frcp', a
)),
128 (('frcp', ('frcp', a
)), a
),
129 (('frcp', ('fsqrt', a
)), ('frsq', a
)),
130 (('frcp', ('frsq', a
)), ('fsqrt', a
)),
131 # Boolean simplifications
132 (('ine', 'a@bool', 0), 'a'),
133 (('ieq', 'a@bool', 0), ('inot', 'a')),
134 (('bcsel', a
, True, False), ('ine', a
, 0)),
135 (('bcsel', a
, False, True), ('ieq', a
, 0)),
136 (('bcsel', True, b
, c
), b
),
137 (('bcsel', False, b
, c
), c
),
138 # The result of this should be hit by constant propagation and, in the
139 # next round of opt_algebraic, get picked up by one of the above two.
140 (('bcsel', '#a', b
, c
), ('bcsel', ('ine', 'a', 0), b
, c
)),
142 # This one may not be exact
143 (('feq', ('fadd', a
, b
), 0.0), ('feq', a
, ('fneg', b
))),
146 # Add optimizations to handle the case where the result of a ternary is
147 # compared to a constant. This way we can take things like
153 # a ? (0 > 0) : (1 > 0)
155 # which constant folding will eat for lunch. The resulting ternary will
156 # further get cleaned up by the boolean reductions above and we will be
157 # left with just the original variable "a".
158 for op
in ['flt', 'fge', 'feq', 'fne',
159 'ilt', 'ige', 'ieq', 'ine', 'ult', 'uge']:
161 ((op
, ('bcsel', 'a', '#b', '#c'), '#d'),
162 ('bcsel', 'a', (op
, 'b', 'd'), (op
, 'c', 'd'))),
163 ((op
, '#d', ('bcsel', a
, '#b', '#c')),
164 ('bcsel', 'a', (op
, 'd', 'b'), (op
, 'd', 'c'))),
167 print nir_algebraic
.AlgebraicPass("nir_opt_algebraic", optimizations
).render()
projects / mesa.git / blob