ARM VERSION 1.2 - Manual (Page 294)

Directives Reference
7-12 Copyright © 2000, 2001 ARM Limited. All rights reserved. ARM DUI 0068B
7.2.8 FN
The FN directive defines a name for a specified FPA floating-point register. The names
f0-f7 and F0-F7 are predefined.
Syntax
name FN expr
where:
name is the name to be assigned to the floating-point register. name cannot be
the same as any of the predefined names listed in Predefined register and
coprocessor names on page 3-9.
expr evaluates to a floating-point register number from 0 to 7.
Usage
Use FN to allocate convenient names to FPA floating-point registers, to help you to
remember what you use each one for.
Note
Avoid conflicting uses of the same register under different names.
Example
energy FN 6 ; defines energy as a symbol for
; floating-point register 6