The LAA (Load and Add) instruction packs two operations into one instruction. While you might not want to use it as a single instruction, it seems well- designed for looping, so withhold your initial judgment. There is an added benefit to learning this one – there are lots of other “LOAD AND …” instructions. Learn this one and you will know others by association. Here is the writeup.
Review an Instruction: LAA (IBM Assembler)
