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nir: Add a flag for lowering ffma. 

vc4 cse/algebraic-disabled stats:
total uniforms in shared programs: 13966 -> 13791 (-1.25%)
uniforms in affected programs:     435 -> 260 (-40.23%)
total instructions in shared programs: 44732 -> 44356 (-0.84%)
instructions in affected programs:     9599 -> 9223 (-3.92%)

v2: Rebase to master (no TGSI->NIR present)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> (v1)
This commit is contained in:
Eric Anholt 2015-01-30 13:49:48 -08:00
parent 42a8ace66e
commit e5ecf8e427
2 changed files with 3 additions and 1 deletions
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1
src/glsl/nir/nir.h
View File

@ -1327,6 +1327,7 @@ typedef struct nir_function {
exec_list_get_head(&(func)->overload_list), node)
typedef struct nir_shader_compiler_options {
bool lower_ffma;
bool lower_fpow;
bool lower_fsqrt;
/** lowers fneg and ineg to fsub and isub. */

3
src/glsl/nir/nir_opt_algebraic.py
View File

@ -71,7 +71,8 @@ optimizations = [
(('flrp', a, b, 1.0), b),
(('flrp', a, a, b), a),
(('flrp', 0.0, a, b), ('fmul', a, b)),
(('fadd', ('fmul', a, b), c), ('ffma', a, b, c)),
(('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
(('inot', ('flt', a, b)), ('fge', a, b)),
(('inot', ('fge', a, b)), ('flt', a, b)),