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nir: Add a flag for lowering fneg/ineg.

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vc4 cse/algebraic-disabled stats:
total instructions in shared programs: 44911 -> 44732 (-0.40%)
instructions in affected programs:     11371 -> 11192 (-1.57%)

v2: Fix broken iabs(isub(0, a)) transformation.
v3: Rebase to master (no TGSI->NIR present)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> (v1)
This commit is contained in:
Eric Anholt 2015-01-28 10:52:53 -08:00
parent cb95a228e8
commit 42a8ace66e
2 changed files with 12 additions and 0 deletions
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2
src/glsl/nir/nir.h
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@ -1329,6 +1329,8 @@ typedef struct nir_function {
typedef struct nir_shader_compiler_options {
bool lower_fpow;
bool lower_fsqrt;
/** lowers fneg and ineg to fsub and isub. */
bool lower_negate;
} nir_shader_compiler_options;
typedef struct nir_shader {

10
src/glsl/nir/nir_opt_algebraic.py
View file

@ -141,6 +141,16 @@ optimizations = [
# next round of opt_algebraic, get picked up by one of the above two.
(('bcsel', '#a', b, c), ('bcsel', ('ine', 'a', 0), b, c)),
# Subtracts
(('fsub', 0.0, ('fsub', 0.0, a)), a),
(('isub', 0, ('isub', 0, a)), a),
(('fneg', a), ('fsub', 0.0, a), 'options->lower_negate'),
(('ineg', a), ('isub', 0, a), 'options->lower_negate'),
(('fadd', a, ('fsub', 0.0, b)), ('fsub', a, b)),
(('iadd', a, ('isub', 0, b)), ('isub', a, b)),
(('fabs', ('fsub', 0.0, a)), ('fabs', a)),
(('iabs', ('isub', 0, a)), ('iabs', a)),
# This one may not be exact
(('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))),
]