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nir/algebraic: Add more lowering

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This commit adds lowering options for the following opcodes:

 - nir_op_fmod
 - nir_op_bitfield_insert
 - nir_op_uadd_carry
 - nir_op_usub_borrow

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jason Ekstrand 2016-01-06 15:30:38 -08:00 • committed by Jason Ekstrand
parent b0d4ee520e
commit d00abcc283
2 changed files with 10 additions and 0 deletions
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4
src/glsl/nir/nir.h
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@ -1446,6 +1446,10 @@ typedef struct nir_shader_compiler_options {
bool lower_fpow;
bool lower_fsat;
bool lower_fsqrt;
bool lower_fmod;
bool lower_bitfield_insert;
bool lower_uadd_carry;
bool lower_usub_borrow;
/** lowers fneg and ineg to fsub and isub. */
bool lower_negate;
/** lowers fsub and isub to fadd+fneg and iadd+ineg. */

6
src/glsl/nir/nir_opt_algebraic.py
View file

@ -222,6 +222,12 @@ optimizations = [
(('iadd', a, ('isub', 0, b)), ('isub', a, b)),
(('fabs', ('fsub', 0.0, a)), ('fabs', a)),
(('iabs', ('isub', 0, a)), ('iabs', a)),
# Misc. lowering
(('fmod', a, b), ('fsub', a, ('fmul', b, ('ffloor', ('fdiv', a, b)))), 'options->lower_fmod'),
(('bitfield_insert', a, b, c, d), ('bfi', ('bfm', d, c), b, a), 'options->lower_bitfield_insert'),
(('uadd_carry', a, b), ('b2i', ('ult', ('iadd', a, b), a)), 'options->lower_uadd_carry'),
(('usub_borrow', a, b), ('b2i', ('ult', a, b)), 'options->lower_usub_borrow'),
]
# Add optimizations to handle the case where the result of a ternary is