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nir/algebraic: Optimize low 32 bit extraction

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Optimize a situation where we only need lower 32 bits from 64 bit
result.

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Suggested-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Sagar Ghuge
2019-02-25 11:43:53 -08:00
parent 1d8994a63b
commit 47ec9bdc60
1 changed files with 2 additions and 0 deletions
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src/compiler/nir/nir_opt_algebraic.py
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@@ -70,6 +70,8 @@ optimizations = [
(('imul', a, '#b@32(is_pos_power_of_two)'), ('ishl', a, ('find_lsb', b))),
(('imul', a, '#b@32(is_neg_power_of_two)'), ('ineg', ('ishl', a, ('find_lsb', ('iabs', b))))),
(('unpack_64_2x32_split_x', ('imul_2x32_64(is_used_once)', a, b)), ('imul', a, b)),
(('unpack_64_2x32_split_x', ('umul_2x32_64(is_used_once)', a, b)), ('imul', a, b)),
(('imul_2x32_64', a, b), ('pack_64_2x32_split', ('imul', a, b), ('imul_high', a, b)), 'options->lower_mul_2x32_64'),
(('umul_2x32_64', a, b), ('pack_64_2x32_split', ('imul', a, b), ('umul_high', a, b)), 'options->lower_mul_2x32_64'),
(('udiv', a, 1), a),