ARM VERSION 1.2 - Manual (Page 226)

Thumb Instruction Reference
5-32 Copyright © 2000, 2001 ARM Limited. All rights reserved. ARM DUI 0068B
5.4.1 B
Branch. This is the only instruction in the Thumb instruction set that can be conditional.
Syntax
B{cond} label
where:
cond is an optional condition code (see Table 5-2 on page 5-33).
label is a program-relative expression. This is usually a label within the same
piece of code. See Register-relative and program-relative expressions on
page 3-23 for more information.
label must be within:
• –252 to +258 bytes of the current instruction, if cond is used
•
±2KB if the instruction is unconditional.
Usage
The B instruction causes a branch to label , if cond is satisfied, or if cond is not used.
Note
label must be within the specified limits. The ARM linker cannot add code to generate
longer branches.
Architectures
This instruction is available in all T variants of the ARM architecture.
Examples
B dloop
BEQ sectB