ARM VERSION 1.2 - Manual (Page 257)

Vector Floating-point Programming
ARM DUI 0068B Copyright © 2000, 2001 ARM Limited. All rights reserved. 6-19
6.7.3 FCMP
Floating-point compare.
FCMP is always scalar.
Syntax
FCMP{E}<precision>{cond} Fd, Fm
FCMP{E}Z<precision>{cond} Fd
where:
E is an optional parameter. If E is present, an exception is raised if either
operand is any kind of NaN. Otherwise, an exception is raised only if
either operand is a signalling NaN.
Z is a parameter specifying comparison with zero.
<precision>
must be either S for single-precision, or D for double-precision.
cond is an optional condition code (see VFP and condition codes on page 6-8).
Fd is the VFP register holding the first operand.
Fm is the VFP register holding the second operand. Omit Fm for a compare
with zero instruction.
The precision of Fd and Fm must match the precision specified in <precision> .
Usage
The FCMP instruction subtracts the value in Fm from the value in Fd and sets the VFP
condition flags on the result (see VFP and condition codes on page 6-8).
Exceptions
FCMP instructions can produce Invalid Operation exceptions.
Examples
FCMPS s3, s0
FCMPEDNE d5, d13
FCMPZSEQ s2