nir: Add new rules to optimize NOOP pack/unpack pairs
nir_load_store_vectorize_test.ssbo_load_adjacent_32_32_64_64 expectations need to be fixed accordingly. Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5589>
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@ -991,8 +991,13 @@ optimizations.extend([
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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_y', ('pack_64_2x32_split', a, b)), b),
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(('unpack_64_2x32', ('pack_64_2x32_split', a, b)), ('vec2', a, b)),
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(('unpack_64_2x32', ('pack_64_2x32', a)), a),
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(('pack_64_2x32_split', ('unpack_64_2x32_split_x', a),
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('unpack_64_2x32_split_y', a)), a),
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(('pack_64_2x32', ('vec2', ('unpack_64_2x32_split_x', a),
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('unpack_64_2x32_split_y', a))), a),
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(('pack_64_2x32', ('unpack_64_2x32', a)), a),
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# Comparing two halves of an unpack separately. While this optimization
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# should be correct for non-constant values, it's less obvious that it's
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@ -902,23 +902,19 @@ TEST_F(nir_load_store_vectorize_test, ssbo_load_adjacent_32_32_64_64)
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ASSERT_EQ(loads[0x3]->src.ssa, &load->dest.ssa);
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ASSERT_EQ(loads[0x3]->swizzle[0], 2);
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/* pack_64_2x32(unpack_64_2x32()) is created because the 32-bit and first
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* 64-bit loads are combined before the second 64-bit load is even considered. */
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nir_ssa_def *val = loads[0x2]->src.ssa;
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ASSERT_EQ(val->bit_size, 64);
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ASSERT_EQ(val->num_components, 1);
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ASSERT_TRUE(test_alu(val->parent_instr, nir_op_pack_64_2x32));
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nir_alu_instr *pack = nir_instr_as_alu(val->parent_instr);
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ASSERT_TRUE(test_alu(pack->src[0].src.ssa->parent_instr, nir_op_unpack_64_2x32));
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nir_alu_instr *unpack = nir_instr_as_alu(pack->src[0].src.ssa->parent_instr);
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ASSERT_EQ(unpack->src[0].src.ssa, &load->dest.ssa);
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ASSERT_EQ(unpack->src[0].swizzle[0], 1);
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ASSERT_TRUE(test_alu(val->parent_instr, nir_op_mov));
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nir_alu_instr *mov = nir_instr_as_alu(val->parent_instr);
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ASSERT_EQ(mov->src[0].src.ssa, &load->dest.ssa);
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ASSERT_EQ(mov->src[0].swizzle[0], 1);
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val = loads[0x1]->src.ssa;
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ASSERT_EQ(val->bit_size, 32);
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ASSERT_EQ(val->num_components, 2);
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ASSERT_TRUE(test_alu(val->parent_instr, nir_op_unpack_64_2x32));
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unpack = nir_instr_as_alu(val->parent_instr);
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nir_alu_instr *unpack = nir_instr_as_alu(val->parent_instr);
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ASSERT_EQ(unpack->src[0].src.ssa, &load->dest.ssa);
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ASSERT_EQ(unpack->src[0].swizzle[0], 0);
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}
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