Review an Instruction: AGSI

One thing that’s great about learning IBM assembler is that if you master one instruction, you often learn a handful of others by association. That’s the case with AGSI – Add Grande Storage Immediate, which is related to ASI. The G in AGSI suggests a register might be involved, but don’t be fooled. Both operands are in storage. The first operand is eight bytes – the size of a grande register,the second operand is a single immediate constant that occupies the second byte of the instruction. Get the details here. Watch the instruction in action with Visiblez here.