Learn to Program with Assembly: Foundational Learning for New Programmers

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2021

J. BartlettLearn to Program with Assemblyhttps://doi.org/10.1007/978-1-4842-7437-8_8

8. Signed Numbers and Bitwise Operations

Jonathan Bartlett¹  

(1)

Tulsa, OK, USA

 

So far, we have only considered values that are nonnegative integers. Technically, this is really what all values are underneath the covers. However, using special instructions and flags of the %eflags register, the CPU can treat these values as if they were different kinds of numbers (such as signed integers or even decimal numbers). In this chapter, we will look at these instructions and flags and aim to understand how the processor deals with these values.

8.1 Decimal, Binary, Hexadecimal, and ...