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nir: add fceil lowering 

lowers ceil(x) as -floor(-x)

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Jonathan Marek 2018-11-12 12:49:32 -05:00 committed by Rob Clark
parent 11593f9041
commit 3e7186d472
2 changed files with 4 additions and 0 deletions
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3
src/compiler/nir/nir.h
View File

@ -2130,6 +2130,9 @@ typedef struct nir_shader_compiler_options {
/** lowers ffract to fsub+ffloor: */
bool lower_ffract;
/** lowers fceil to fneg+ffloor+fneg: */
bool lower_fceil;
bool lower_ldexp;
bool lower_pack_half_2x16;

1
src/compiler/nir/nir_opt_algebraic.py
View File

@ -125,6 +125,7 @@ optimizations = [
(('flrp@64', a, b, c), ('fadd', ('fmul', c, ('fsub', b, a)), a), 'options->lower_flrp64'),
(('ffloor', a), ('fsub', a, ('ffract', a)), 'options->lower_ffloor'),
(('ffract', a), ('fsub', a, ('ffloor', a)), 'options->lower_ffract'),
(('fceil', a), ('fneg', ('ffloor', ('fneg', a))), 'options->lower_fceil'),
(('~fadd', ('fmul', a, ('fadd', 1.0, ('fneg', ('b2f', c)))), ('fmul', b, ('b2f', c))), ('bcsel', c, b, a), 'options->lower_flrp32'),
(('~fadd@32', ('fmul', a, ('fadd', 1.0, ('fneg', c ))), ('fmul', b, c )), ('flrp', a, b, c), '!options->lower_flrp32'),
(('~fadd@64', ('fmul', a, ('fadd', 1.0, ('fneg', c ))), ('fmul', b, c )), ('flrp', a, b, c), '!options->lower_flrp64'),