Top "Instruction-set" questions

Use for questions related to Instruction Set Architectures, ISA.

What exactly does the 3 operand imul instruction do in ia-32 assembly?

I'm reading the instruction imul 0xffffffd4(%ebp, %ebx, 4), %eax and I'm baffled by what it's doing exactly. I understand that …

assembly opcode instruction-set x86
How does the CPU know its instruction set?

Basic computer operation question but I'm not sure how to ask it. When we say that a computer has an …

cpu machine-code instruction-set