AMD 250 Manuale Utente
Appendix E
SSE and SSE2 Optimizations
355
Software Optimization Guide for AMD64 Processors
25112
Rev. 3.06
September 2005
Appendix E SSE and SSE2 Optimizations
This appendix describes specific optimizations that can be utilized to improve performance when
using SSE and SSE2 instructions on AMD Athlon™ 64 and AMD Opteron™ processors.
using SSE and SSE2 instructions on AMD Athlon™ 64 and AMD Opteron™ processors.
Types of XMM-Register Data
The XMM registers (used by the SSE and SSE2 instructions) can hold the following three types of
data:
data:
•
Floating-point single-precision (FPS)
•
Floating-point double-precision (FPD)
•
Integer (INT)
Types of SSE and SSE2 Instructions
Most SSE and SSE2 instructions can be divided into five types according to the type of data they
produce and therefore expect to consume:
produce and therefore expect to consume:
•
Floating-point single-precision (FPS)
•
Floating-point double-precision (FPD)
•
Integer (INT)
•
Load (produces data of type FPS, FPD, or INT)
•
Store (can consume a register with data of any type)
This appendix covers the following topics:
Topic
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