ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

The CPUID Identification Scheme
FtZ mode, bits [7:4]
Indicates whether the VFP hardware implementation supports only the Flush-to-Zero mode
of operation. Permitted values are:
0b0000 Hardware supports only the Flush-to-Zero mode of operation. If a VFP
subarchitecture is implemented its support code might include support for full
denormalized number arithmetic.
0b0001 Hardware supports full denormalized number arithmetic.
B5.3.3 Accessing the Advanced SIMD and VFP feature identification registers
You access the Advanced SIMD and VFP feature identification registers using the VMRS instruction, see
VMRS on page A8-658.
For example:
VMRS , FPSID ; Read Floating-Point System ID Register
VMRS , MVFR1 ; Read Media and VFP Feature Register 1
B5-40 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B