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If you want to think of it in terms of 4-to-1 LUT functions (as in an FPGA), then one lut4 instruction on RV64 performs 64 such operations, under the following constraints: i%4 == j%4 -> same INIT value i//4 == j//4 -> same set of 4 input signals
On RV32 you'll need a sequence of 4 instructions to perform 32 such operations, with the same constraints as above.
I have been staring at your reply and looking at the reference C function for some time now and finally concluded that I have no idea how this thing works
I'm probably better at making CPUs out of LUTs than making LUTs out of CPUs
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