nir/algebraic: add optimizations for fsign/isign
This just reverts fsign/isign lowering. Totals from affected shaders: SGPRS: 257496 -> 256672 (-0.32 %) VGPRS: 181800 -> 178864 (-1.61 %) Spilled SGPRs: 105 -> 105 (0.00 %) Spilled VGPRs: 0 -> 0 (0.00 %) Private memory VGPRs: 0 -> 0 (0.00 %) Scratch size: 0 -> 0 (0.00 %) dwords per thread Code Size: 11355852 -> 11141840 (-1.88 %) bytes LDS: 3789 -> 3789 (0.00 %) blocks Max Waves: 30453 -> 30951 (1.64 %) Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Reviewed-by: Rhys Perry <pendingchaos02@gmail.com> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4830>
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@ -1394,7 +1394,11 @@ optimizations.extend([
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'options->lower_pack_split'),
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(('isign', a), ('imin', ('imax', a, -1), 1), 'options->lower_isign'),
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(('imin', ('imax', a, -1), 1), ('isign', a), '!options->lower_isign'),
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(('imax', ('imin', a, 1), -1), ('isign', a), '!options->lower_isign'),
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(('fsign', a), ('fsub', ('b2f', ('flt', 0.0, a)), ('b2f', ('flt', a, 0.0))), 'options->lower_fsign'),
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(('fadd', ('b2f32', ('flt', 0.0, 'a@32')), ('fneg', ('b2f32', ('flt', 'a@32', 0.0)))), ('fsign', a), '!options->lower_fsign'),
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(('iadd', ('b2i32', ('flt', 0, 'a@32')), ('ineg', ('b2i32', ('flt', 'a@32', 0)))), ('f2i32', ('fsign', a)), '!options->lower_fsign'),
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# Address/offset calculations:
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# Drivers supporting imul24 should use the nir_lower_amul() pass, this
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