Last updated April 10, 2022

Status: Tags: #cards/cmpt295/data Links: CPU Registers - Floating Point Data

XMM Registers

Principles

?

• 16 in total, each 16-bytes wide
• named %xmm0, ... %xmm15
  • 0-7 are for parameters
  • 8-15 are for local data
• All are caller-saved
• Parameters are being passed into xmm
• Result is stored in xmm0

Can be used in tandem with regular bit registers ?

• 
• Pointers and integers stored into bit
• Float registers passed into XMM

Structure

• Groups of registers, allows you to apply to all

Scalar

Scalar mode and vector (packed) modes

• 1 single-precision float
• addss vs addps
  • code determines scalar vs vector
  • s determines single precision
• 

Converting values inside registers

Operations

Artihmetic ?

• s stands for single (int), d stands for double (double/64)
• addss
• subss
• mulss
• divss

Logical ?

• andps
• orps
• xorps

Comparison ?

• ucomiss

Math ?

• maxss
• minss
• sqrtss

References:

Created:: 2022-03-14 03:28