He hinted at this obliquely, but the PowerPC family of bit rotate instructions (ridicl, rlwinm, rlwimi, etc.), although intimidating in the general case, allows

He hinted at this obliquely, but the PowerPC family of bit rotate instructions (ridicl, rlwinm, rlwimi, etc.), although intimidating in the general case, allows shifting, rotation, insertion, masking and more. There are many alternative mnemonics to try to reduce the cognitive complexity but all of these just assemble to them with particular parameters.