lowers ceil(x) as -floor(-x)
Signed-off-by: Jonathan Marek <jonat...@marek.ca>
---
src/compiler/nir/nir.h | 3 +++
src/compiler/nir/nir_opt_algebraic.py | 1 +
2 files changed, 4 insertions(+)
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index dc3c729dee..f9b32a5daf 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2086,6 +2086,9 @@ 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;
diff --git a/src/compiler/nir/nir_opt_algebraic.py
b/src/compiler/nir/nir_opt_algebraic.py
index 8b24daddfd..8f4df891b8 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -124,6 +124,7 @@ optimizations = [
(('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'),
(('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'),
--
2.17.1
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