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Diffstat (limited to 'mesalib/src/glsl/nir/nir_opt_algebraic.py')
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diff --git a/mesalib/src/glsl/nir/nir_opt_algebraic.py b/mesalib/src/glsl/nir/nir_opt_algebraic.py new file mode 100644 index 000000000..7bf643134 --- /dev/null +++ b/mesalib/src/glsl/nir/nir_opt_algebraic.py @@ -0,0 +1,188 @@ +#! /usr/bin/env python +# +# Copyright (C) 2014 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. +# +# Authors: +# Jason Ekstrand (jason@jlekstrand.net) + +import nir_algebraic + +# Convenience variables +a = 'a' +b = 'b' +c = 'c' +d = 'd' + +# Written in the form (<search>, <replace>) where <search> is an expression +# and <replace> is either an expression or a value. An expression is +# defined as a tuple of the form (<op>, <src0>, <src1>, <src2>, <src3>) +# where each source is either an expression or a value. A value can be +# either a numeric constant or a string representing a variable name. +# +# Variable names are specified as "[#]name[@type]" where "#" inicates that +# the given variable will only match constants and the type indicates that +# the given variable will only match values from ALU instructions with the +# given output type. +# +# For constants, you have to be careful to make sure that it is the right +# type because python is unaware of the source and destination types of the +# opcodes. + +optimizations = [ + (('fneg', ('fneg', a)), a), + (('ineg', ('ineg', a)), a), + (('fabs', ('fabs', a)), ('fabs', a)), + (('fabs', ('fneg', a)), ('fabs', a)), + (('iabs', ('iabs', a)), ('iabs', a)), + (('iabs', ('ineg', a)), ('iabs', a)), + (('fadd', a, 0.0), a), + (('iadd', a, 0), a), + (('fmul', a, 0.0), 0.0), + (('imul', a, 0), 0), + (('fmul', a, 1.0), a), + (('imul', a, 1), a), + (('fmul', a, -1.0), ('fneg', a)), + (('imul', a, -1), ('ineg', a)), + (('ffma', 0.0, a, b), b), + (('ffma', a, 0.0, b), b), + (('ffma', a, b, 0.0), ('fmul', a, b)), + (('ffma', a, 1.0, b), ('fadd', a, b)), + (('ffma', 1.0, a, b), ('fadd', a, b)), + (('flrp', a, b, 0.0), a), + (('flrp', a, b, 1.0), b), + (('flrp', a, a, b), a), + (('flrp', 0.0, a, b), ('fmul', a, b)), + (('ffma', a, b, c), ('fadd', ('fmul', a, b), c), 'options->lower_ffma'), + (('fadd', ('fmul', a, b), c), ('ffma', a, b, c), '!options->lower_ffma'), + # Comparison simplifications + (('inot', ('flt', a, b)), ('fge', a, b)), + (('inot', ('fge', a, b)), ('flt', a, b)), + (('inot', ('ilt', a, b)), ('ige', a, b)), + (('inot', ('ige', a, b)), ('ilt', a, b)), + (('flt', ('fadd', a, b), 0.0), ('flt', a, ('fneg', b))), + (('fge', ('fadd', a, b), 0.0), ('fge', a, ('fneg', b))), + (('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))), + (('fne', ('fadd', a, b), 0.0), ('fne', a, ('fneg', b))), + (('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)), + (('bcsel', ('flt', a, b), a, b), ('fmin', a, b)), + (('bcsel', ('flt', a, b), b, a), ('fmax', a, b)), + (('bcsel', ('inot', 'a@bool'), b, c), ('bcsel', a, c, b)), + (('bcsel', a, ('bcsel', a, b, c), d), ('bcsel', a, b, d)), + (('fmin', ('fmax', a, 0.0), 1.0), ('fsat', a), '!options->lower_fsat'), + (('fsat', a), ('fmin', ('fmax', a, 0.0), 1.0), 'options->lower_fsat'), + (('fsat', ('fsat', a)), ('fsat', a)), + (('fmin', ('fmax', ('fmin', ('fmax', a, 0.0), 1.0), 0.0), 1.0), ('fmin', ('fmax', a, 0.0), 1.0)), + # Comparison with the same args. Note that these are not done for + # the float versions because NaN always returns false on float + # inequalities. + (('ilt', a, a), False), + (('ige', a, a), True), + (('ieq', a, a), True), + (('ine', a, a), False), + (('ult', a, a), False), + (('uge', a, a), True), + # Logical and bit operations + (('fand', a, 0.0), 0.0), + (('iand', a, a), a), + (('iand', a, 0), 0), + (('ior', a, a), a), + (('ior', a, 0), a), + (('fxor', a, a), 0.0), + (('ixor', a, a), 0), + (('inot', ('inot', a)), a), + # DeMorgan's Laws + (('iand', ('inot', a), ('inot', b)), ('inot', ('ior', a, b))), + (('ior', ('inot', a), ('inot', b)), ('inot', ('iand', a, b))), + # Shift optimizations + (('ishl', 0, a), 0), + (('ishl', a, 0), a), + (('ishr', 0, a), 0), + (('ishr', a, 0), a), + (('ushr', 0, a), 0), + (('ushr', a, 0), 0), + # Exponential/logarithmic identities + (('fexp2', ('flog2', a)), a), # 2^lg2(a) = a + (('fexp', ('flog', a)), a), # e^ln(a) = a + (('flog2', ('fexp2', a)), a), # lg2(2^a) = a + (('flog', ('fexp', a)), a), # ln(e^a) = a + (('fpow', a, b), ('fexp2', ('fmul', ('flog2', a), b)), 'options->lower_fpow'), # a^b = 2^(lg2(a)*b) + (('fexp2', ('fmul', ('flog2', a), b)), ('fpow', a, b), '!options->lower_fpow'), # 2^(lg2(a)*b) = a^b + (('fexp', ('fmul', ('flog', a), b)), ('fpow', a, b), '!options->lower_fpow'), # e^(ln(a)*b) = a^b + (('fpow', a, 1.0), a), + (('fpow', a, 2.0), ('fmul', a, a)), + (('fpow', 2.0, a), ('fexp2', a)), + # Division and reciprocal + (('fdiv', 1.0, a), ('frcp', a)), + (('frcp', ('frcp', a)), a), + (('frcp', ('fsqrt', a)), ('frsq', a)), + (('fsqrt', a), ('frcp', ('frsq', a)), 'options->lower_fsqrt'), + (('frcp', ('frsq', a)), ('fsqrt', a), '!options->lower_fsqrt'), + # Boolean simplifications + (('ine', 'a@bool', 0), 'a'), + (('ieq', 'a@bool', 0), ('inot', 'a')), + (('bcsel', a, True, False), ('ine', a, 0)), + (('bcsel', a, False, True), ('ieq', a, 0)), + (('bcsel', True, b, c), b), + (('bcsel', False, b, c), c), + # The result of this should be hit by constant propagation and, in the + # next round of opt_algebraic, get picked up by one of the above two. + (('bcsel', '#a', b, c), ('bcsel', ('ine', 'a', 0), b, c)), + + (('bcsel', a, b, b), b), + (('fcsel', a, b, b), b), + + # Subtracts + (('fsub', a, ('fsub', 0.0, b)), ('fadd', a, b)), + (('isub', a, ('isub', 0, b)), ('iadd', a, b)), + (('fneg', a), ('fsub', 0.0, a), 'options->lower_negate'), + (('ineg', a), ('isub', 0, a), 'options->lower_negate'), + (('fadd', a, ('fsub', 0.0, b)), ('fsub', a, b)), + (('iadd', a, ('isub', 0, b)), ('isub', a, b)), + (('fabs', ('fsub', 0.0, a)), ('fabs', a)), + (('iabs', ('isub', 0, a)), ('iabs', a)), + +# This one may not be exact + (('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))), +] + +# Add optimizations to handle the case where the result of a ternary is +# compared to a constant. This way we can take things like +# +# (a ? 0 : 1) > 0 +# +# and turn it into +# +# a ? (0 > 0) : (1 > 0) +# +# which constant folding will eat for lunch. The resulting ternary will +# further get cleaned up by the boolean reductions above and we will be +# left with just the original variable "a". +for op in ['flt', 'fge', 'feq', 'fne', + 'ilt', 'ige', 'ieq', 'ine', 'ult', 'uge']: + optimizations += [ + ((op, ('bcsel', 'a', '#b', '#c'), '#d'), + ('bcsel', 'a', (op, 'b', 'd'), (op, 'c', 'd'))), + ((op, '#d', ('bcsel', a, '#b', '#c')), + ('bcsel', 'a', (op, 'd', 'b'), (op, 'd', 'c'))), + ] + +print nir_algebraic.AlgebraicPass("nir_opt_algebraic", optimizations).render() |