ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Instruction Details
A8.6.413 YIELD
YIELD is a hint instruction. It enables software with a multithreading capability to indicate to the hardware
that it is performing a task, for example a spin-lock, that could be swapped out to improve overall system
performance. Hardware can use this hint to suspend and resume multiple code threads if it supports the
capability.
Encoding T1 ARMv7 (executes as NOP in ARMv6T2)
YIELD
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 0 1 1 1 1 1 1 0 0 0 1 0 0 0 0
// No additional decoding required
Encoding T2 ARMv7 (executes as NOP in ARMv6T2)
YIELD.W
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 1 1 0 0 1 1 1 0 1 0 (1)(1)(1) (1) 1 0 (0) 0 (0) 0 0 0 0 0 0 0 0 0 0 1
// No additional decoding required
Encoding A1 ARMv6K, ARMv7 (executes as NOP in ARMv6T2)
YIELD
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
cond 0 0 1 1 0 0 1 0 0 0 0 0 (1)(1)(1)(1)(0)(0)(0)(0) 0 0 0 0 0 0 0 1
// No additional decoding required
A8-812 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B