#imul

King of Milk products, “Amul” is a well-known trademark now!

Written By: Avasi Mohanty

Every household’s favorite dairy product brand “AMUL” has added another feather to its cap. Going with the direction of Intellectual Property Appellate Board (IPAB), mark “Amul” is accorded the status of a well-known trademarkin India , sharing platform with the likes of Coca-Cola, Kodak, Nestle and Microsoft. Anand Milk Federation Union Limited (Amul) is a…

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 imul multiplies, but I can’t figure out the syntax.

Best Answer

Hooray for AT&T assembly base/index syntax! It’s not a 3-operand multiply at all. It’s the same 2-operand one you know and love, it’s just that the first one is a bit complicated. It means:

%ebp + (4…