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nir: Add optimization to use ROR/ROL instructions

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v2: 1) Add more optimization rules for ROL/ROR (Matt Turner)
    2) Add lowering rules for ROL/ROR (Matt Turner)

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Sagar Ghuge 2019-05-30 14:15:51 -07:00
parent 81d342e2a1
commit 80117117bd
2 changed files with 15 additions and 0 deletions
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3
src/compiler/nir/nir.h
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@ -2423,6 +2423,9 @@ typedef struct nir_shader_compiler_options {
/* Lowers when 32x32->64 bit multiplication is not supported */
bool lower_mul_2x32_64;
/* Lowers when rotate instruction is not supported */
bool lower_rotate;
unsigned max_unroll_iterations;
nir_lower_int64_options lower_int64_options;

12
src/compiler/nir/nir_opt_algebraic.py
View file

@ -585,6 +585,18 @@ optimizations = [
(('ushr', a, 0), a),
(('iand', 0xff, ('ushr@32', a, 24)), ('ushr', a, 24)),
(('iand', 0xffff, ('ushr@32', a, 16)), ('ushr', a, 16)),
(('ior', ('ishl@16', a, b), ('ushr@16', a, ('iadd', 16, ('ineg', b)))), ('urol', a, b), '!options->lower_rotate'),
(('ior', ('ishl@16', a, b), ('ushr@16', a, ('isub', 16, b))), ('urol', a, b), '!options->lower_rotate'),
(('ior', ('ishl@32', a, b), ('ushr@32', a, ('iadd', 32, ('ineg', b)))), ('urol', a, b), '!options->lower_rotate'),
(('ior', ('ishl@32', a, b), ('ushr@32', a, ('isub', 32, b))), ('urol', a, b), '!options->lower_rotate'),
(('ior', ('ushr@16', a, b), ('ishl@16', a, ('iadd', 16, ('ineg', b)))), ('uror', a, b), '!options->lower_rotate'),
(('ior', ('ushr@16', a, b), ('ishl@16', a, ('isub', 16, b))), ('uror', a, b), '!options->lower_rotate'),
(('ior', ('ushr@32', a, b), ('ishl@32', a, ('iadd', 32, ('ineg', b)))), ('uror', a, b), '!options->lower_rotate'),
(('ior', ('ushr@32', a, b), ('ishl@32', a, ('isub', 32, b))), ('uror', a, b), '!options->lower_rotate'),
(('urol@16', a, b), ('ior', ('ishl', a, b), ('ushr', a, ('isub', 16, b))), 'options->lower_rotate'),
(('urol@32', a, b), ('ior', ('ishl', a, b), ('ushr', a, ('isub', 32, b))), 'options->lower_rotate'),
(('uror@16', a, b), ('ior', ('ushr', a, b), ('ishl', a, ('isub', 16, b))), 'options->lower_rotate'),
(('uror@32', a, b), ('ior', ('ushr', a, b), ('ishl', a, ('isub', 32, b))), 'options->lower_rotate'),
# Exponential/logarithmic identities
(('~fexp2', ('flog2', a)), a), # 2^lg2(a) = a
(('~flog2', ('fexp2', a)), a), # lg2(2^a) = a