x86-64 instructions for floating-point comparisons

What are the x86-64 instructions for floating-point comparisons like the cmpq for quard-word integer comparison? The SSE3 extenstions provide two instructions for comparing floating values: Instruction Based on Description ucomiss S2, S1 S1 – S2 Compare single precision ucomisd S2, S1 S1 – S2 Compare double precision As with cmpq, they follow the GAS convention […]

A Beginners’ Guide to x86-64 Instruction Encoding

The encoding of x86 and x86-64 instructions is well documented in Intel or AMD’s manuals. However, they are not quite easy for beginners to start with to learn encoding of the x86-64 instructions. In this post, I will give a list of useful manuals for understanding and studying the x86-64 instruction encoding, a brief introduction […]

x86-64 ISA / Assembly Programming References

This post collect the reference resource for x86-64 (also know as Intel 64, AMD 64) ISA / assembly language programming. x86-64 is a 64-bit extension of the Intel x86 instruction set. x86-64 Assembly Programming ∞ Introduction to Computer Systems Resources (15-213 Introduction to Computer Systems Resources from CMU) Lots materials for learning machine-level programming on […]