Add a mechanism for fully arbitrary ALUs. #377
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If gowin_pack encounters an ALU with the RAW_ALU_LUT parameter set, the value of this parameter is used to set the ALU fuse without changes. This allows, for example, in nextpnr, to disable constant inputs from networks and modify the ALU LUT so that these inputs do not affect the result. Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
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If gowin_pack encounters an ALU with the RAW_ALU_LUT parameter set, the value of this parameter is used to set the ALU fuse without changes.
This allows, for example, in nextpnr, to disable constant inputs from networks and modify the ALU LUT so that these inputs do not affect the result.