nir: Lower !f2b(x) to x == 0.0
Some trivial help now, but it also prevents ~40 regressions caused by Samuel's "nir: implement the GLSL equivalent of if simplication in nir_opt_if" patch. All Gen4+ platforms had similar results. (Skylake shown) total instructions in shared programs: 14369557 -> 14369555 (<.01%) instructions in affected programs: 442 -> 440 (-0.45%) helped: 2 HURT: 0 total cycles in shared programs: 532425772 -> 532425743 (<.01%) cycles in affected programs: 6086 -> 6057 (-0.48%) helped: 2 HURT: 0 Signed-off-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com> Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
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@ -441,6 +441,7 @@ optimizations = [
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(('i2b', ('iabs', a)), ('i2b', a)),
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(('i2b', ('iabs', a)), ('i2b', a)),
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(('fabs', ('b2f', a)), ('b2f', a)),
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(('fabs', ('b2f', a)), ('b2f', a)),
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(('iabs', ('b2i', a)), ('b2i', a)),
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(('iabs', ('b2i', a)), ('b2i', a)),
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(('inot', ('f2b', a)), ('feq', a, 0.0)),
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# Packing and then unpacking does nothing
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# Packing and then unpacking does nothing
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(('unpack_64_2x32_split_x', ('pack_64_2x32_split', a, b)), a),
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(('unpack_64_2x32_split_x', ('pack_64_2x32_split', a, b)), a),
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