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nir/opt_algebraic: add some imul24_relaxed pattern

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41178>
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Daniel Schürmann 2026-04-24 14:02:56 +02:00 • committed by Marge Bot
parent 708093d830
commit 012d72f2b0
1 changed files with 7 additions and 0 deletions
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7
src/compiler/nir/nir_opt_algebraic.py
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@ -178,6 +178,8 @@ optimizations = [
(('imul', a, '#b(is_pos_power_of_two)'), ('ishl', a, ('find_lsb', b)), '!options->lower_bitops'),
(('imul24_relaxed', a, '#b(is_pos_power_of_two)'), ('ishl', a, ('find_lsb', b)), '!options->lower_bitops'),
(('umul24_relaxed', a, '#b(is_pos_power_of_two)'), ('ishl', a, ('find_lsb', b)), '!options->lower_bitops'),
(('imul', 'a@8', 0x80), ('ishl', a, 7), '!options->lower_bitops'),
(('imul', 'a@16', 0x8000), ('ishl', a, 15), '!options->lower_bitops'),
(('imul', 'a@32', 0x80000000), ('ishl', a, 31), '!options->lower_bitops'),
@ -287,12 +289,17 @@ optimizations += [
(('ffmaz', 'a(is_finite)', 'b(is_finite)', c), ('ffma', a, b, c)),
(('ffmaz', a, a, b), ('ffma', a, a, b)),
(('imul', a, 0), 0),
(('imul24_relaxed', a, 0), 0),
(('umul24_relaxed', a, 0), 0),
(('umul_unorm_4x8_vc4', a, 0), 0),
(('umul_unorm_4x8_vc4', a, ~0), a),
(('fmul', a, 1.0), ('fcanonicalize', a)),
(('imul', a, 1), a),
(('imul24_relaxed', a, 1), a),
(('umul24_relaxed', a, 1), a),
(('fmul', a, -1.0), ('fneg', a)),
(('imul', a, -1), ('ineg', a)),
(('imul24_relaxed', a, -1), ('ineg', a)),
# If a < 0: fsign(a)*a*a => -1*a*a => -a*a => abs(a)*a
# If a > 0: fsign(a)*a*a => 1*a*a => a*a => abs(a)*a
# If a == 0: fsign(a)*a*a => 0*0*0 => abs(0)*0