nir: add lowering for ffloor

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index f984c76fe6607c83cc9784a812230d68a7e654c5..c469e111b2c0df17ac84f8d6cbb82a30f07fba36 100644 (file)
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2083,6 +2083,9 @@ typedef struct nir_shader_compiler_options {
     */
    bool fdot_replicates;
 
+   /** lowers ffloor to fsub+ffract: */
+   bool lower_ffloor;
+
    /** lowers ffract to fsub+ffloor: */
    bool lower_ffract;
 

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 8b24daddfdcd1f7d181efc211d370734c3b6f641..0d8802582aa1bca5e9f6dda5288f3363394d3ae6 100644 (file)
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -123,6 +123,7 @@ optimizations = [
    (('~flrp', a, 0.0, c), ('fadd', ('fmul', ('fneg', a), c), a)),
    (('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'),
+   (('ffloor', a), ('fsub', a, ('ffract', a)), 'options->lower_ffloor'),
    (('ffract', a), ('fsub', a, ('ffloor', a)), 'options->lower_ffract'),
    (('~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'),