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TBB and TBH
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| Home > ARM and Thumb Instructions > TBB and TBH | |||
Table Branch Byte and Table Branch Halfword.
SyntaxTBB [Rn,Rm]
TBH [Rn,Rm, LSL #1]
where:
Rnis the base register. This contains the address of the table of branch lengths.
RnIf PC is specified for
RnRmis the index register. This contains an index into the table.
Rm
These instructions cause a PC-relative forward branch using
a table of single byte offsets (TBB) or halfword offsets
(TBH). RnRmTBB) or the halfword (TBH) returned
from the table. The target of the branch table must be in the same
execution state.
In ThumbEE, if the value in the base register is zero, execution branches to the NullCheck handler at HandlerBase - 4.
| Copyright © 2011-2012 ARM. All rights reserved. | ARM DUI 0588B |
| Non-Confidential | ID062912 |
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