Table of Contents
Advertisement
ARM DDI 0301H
ID012310
In an Symmetric Multi-Threading (SMT) design, a yield instruction enables a thread to generate
a hint to the processor that runs it. The hint indicates that the current activity of the thread is not
important, for example sitting in a spin-lock, and so can yield. On a uniprocessor system, this
instruction behaves as a NOP. OSs can use the yielding NOP in those places that require the
yield hint, and the non-yielding NOP in other cases.
Operation
The instruction acts as a NOP irrespective of whether the condition passes or fails, effectively
the ALWAYS condition. Do not use RESERVED values in software.
Copyright © 2004-2009 ARM Limited. All rights reserved.
Non-Confidential, Unrestricted Access
Programmer's Model
2-35
Hide quick links:
Advertisement
Table of Contents
