ARM VERSION 1.2 - Manual (Page 271)

Vector Floating-point Programming
ARM DUI 0068B Copyright © 2000, 2001 ARM Limited. All rights reserved. 6-33
6.7.14 FMRX, FMXR, and FMSTAT
Transfer contents between an ARM register and a VFP system register.
Syntax
FMRX{cond} Rd, VFPsysreg
FMXR{cond} VFPsysreg, Rd
FMSTAT{cond}
where:
cond is an optional condition code (see VFP and condition codes on page 6-8).
VFPsysreg is the VFP system register, usually FPSCR , FPSID , or FPEXC (see
Floating-point registers on page 6-5).
Rd is the ARM register.
Usage
The FMRX instruction transfers the contents of VFPsysreg into Rd .
The FMXR instruction transfers the contents of Rd into VFPsysreg .
The FMSTAT instruction is a synonym for FMRX r15, FPSCR . It transfers the floating-point
condition flags to the corresponding flags in the ARM CPSR (see VFP and condition
codes on page 6-8).
Note
These instructions stall the ARM until all current VFP operations complete.
Exceptions
These instructions do not produce any exceptions.
Examples
FMSTAT
FMSTATNE
FMXR FPSCR, r2
FMRX r3, FPSID