This tool is handy if you want a specific bit shuffle:
https://programming.sirrida.de/calcperm.php
It doesn't always find the optimal solution but it usually gets close.
https://programming.sirrida.de/calcperm.php
It doesn't always find the optimal solution but it usually gets close.
If compilers/languages/standard libraries provided these bit permutations, and it was just something ~everyone had learned, it would be a lot easier to work with bits without needing to come up with the bitwise ops (or use that generator). In addition it would probably make better use of the hardware: sure, people like to pretend that we’re still programming C for PDP11, but modern hardware supports more operations than C has operators for (RISC-V B extension and co have the right idea <3)
Modern compilers are probably pretty good? but I doubt they are perfect at turning code like that in OP into the best instructions. It is probably a bit late for C/C++ though. maaaybe possible to get it into LLVM and Rust.