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

Instruction Details
A8.6.300 VCVTB, VCVTT (between half-precision and single-precision, VFP)
This instruction does one of the following:
converts the half-precision value in the top or bottom half of a single-precision register to
single-precision and writes the result to a single-precision register
converts the value in a single-precision register to half-precision and writes the result into the top or
bottom half of a single-precision register, preserving the other half of the target register.
Encoding T1 / A1 VFPv3 half-precision extensions
VCVT.F32.F16 ,
VCVT.F16.F32 ,
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 1 0 1 1 1 0 1 D 1 1 0 0 1 op Vd 1 0 1 0 T 1 M 0 Vm
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
cond 1 1 1 0 1 D 1 1 0 0 1 op Vd 1 0 1 0 T 1 M 0 Vm
half_to_single = (op == ‘0’);
lowbit = if T == ‘1’ then 16 else 0;
m = UInt(Vm:M); d = UInt(Vd:D);
A8-588 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B