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nir: add lower_ftrunc

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Port TGSI TRUNC lowering to nir

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Christian Gmeiner
2019-04-12 10:12:27 +02:00
parent e538dd67de
commit b6bed115a5
2 changed files with 3 additions and 0 deletions
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2
src/compiler/nir/nir.h
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@@ -2246,6 +2246,8 @@ typedef struct nir_shader_compiler_options {
/** lowers fceil to fneg+ffloor+fneg: */
bool lower_fceil;
bool lower_ftrunc;
bool lower_ldexp;
bool lower_pack_half_2x16;

1
src/compiler/nir/nir_opt_algebraic.py
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@@ -131,6 +131,7 @@ optimizations = [
(('flrp@16', a, b, c), ('fadd', ('fmul', c, ('fsub', b, a)), a), 'options->lower_flrp16'),
(('flrp@32', a, b, c), ('fadd', ('fmul', c, ('fsub', b, a)), a), 'options->lower_flrp32'),
(('flrp@64', a, b, c), ('fadd', ('fmul', c, ('fsub', b, a)), a), 'options->lower_flrp64'),
(('ftrunc', a), ('bcsel', ('flt', a, 0.0), ('fneg', ('ffloor', ('fabs', a))), ('ffloor', ('fabs', a))), 'options->lower_ftrunc'),
(('ffloor', a), ('fsub', a, ('ffract', a)), 'options->lower_ffloor'),
(('fadd', a, ('fneg', ('ffract', a))), ('ffloor', a), '!options->lower_ffloor'),
(('ffract', a), ('fsub', a, ('ffloor', a)), 'options->lower_ffract'),