Some hardware (i965 on Broadwell generation, for example) does not support
natively the execution of lrp instruction with double arguments.
Add 'lower_lrp_double' flag to lower this instruction in that case.
Signed-off-by: Samuel Iglesias Gonsálvez <sigles...@igalia.com>
---
src/compiler/nir/nir.h | 2 ++
src/compiler/nir/nir_opt_algebraic.py | 7 +++++--
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 0d17ce0..0bfc849 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -1582,6 +1582,8 @@ typedef struct nir_shader_compiler_options {
bool lower_fdiv;
bool lower_ffma;
bool lower_flrp;
+ /** Lowers flrp when it does not supports doubles */
+ bool lower_flrp_double;
bool lower_fpow;
bool lower_fsat;
bool lower_fsqrt;
diff --git a/src/compiler/nir/nir_opt_algebraic.py
b/src/compiler/nir/nir_opt_algebraic.py
index ec8929a..f971585 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -92,11 +92,14 @@ optimizations = [
(('~flrp', 0.0, a, b), ('fmul', a, b)),
(('~flrp', a, b, ('b2f', c)), ('bcsel', c, b, a), 'options->lower_flrp'),
(('flrp', a, b, c), ('fadd', ('fmul', c, ('fsub', b, a)), a),
'options->lower_flrp'),
+ (('flrp', a, b, c), ('fadd', ('fmul', c, ('fsub', b, a)), a),
'!options->lower_flrp && options->lower_flrp_double', 64),
(('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_flrp'),
- (('~fadd', ('fmul', a, ('fadd', 1.0, ('fneg', c ))), ('fmul', b,
c )), ('flrp', a, b, c), '!options->lower_flrp'),
+ (('~fadd', ('fmul', a, ('fadd', 1.0, ('fneg', c ))), ('fmul', b,
c )), ('flrp', a, b, c), '!options->lower_flrp', 32),
+ (('~fadd', ('fmul', a, ('fadd', 1.0, ('fneg', c ))), ('fmul', b,
c )), ('flrp', a, b, c), '!options->lower_flrp &&
!options->lower_flrp_double', 64),
(('~fadd', a, ('fmul', ('b2f', c), ('fadd', b, ('fneg', a)))), ('bcsel', c,
b, a), 'options->lower_flrp'),
- (('~fadd', a, ('fmul', c , ('fadd', b, ('fneg', a)))), ('flrp', a,
b, c), '!options->lower_flrp'),
+ (('~fadd', a, ('fmul', c , ('fadd', b, ('fneg', a)))), ('flrp', a,
b, c), '!options->lower_flrp', 32),
+ (('~fadd', a, ('fmul', c , ('fadd', b, ('fneg', a)))), ('flrp', a,
b, c), '!options->lower_flrp && !options->lower_flrp_double', 64),
(('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
--
2.5.0
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