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

Instruction Details
A8.6.378 VRSQRTE
Vector Reciprocal Square Root Estimate finds an approximate reciprocal square root of each element in a
vector, and places the results in a second vector.
The operand and result elements are the same type, and can be 32-bit floating-point numbers, or 32-bit
unsigned integers.
For details of the operation performed by this instruction see Reciprocal square root on page A2-61.
Encoding T1 / A1 Advanced SIMD (F = 1 UNDEFINED in integer-only variants)
VRSQRTE. ,
VRSQRTE. ,
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 1 1 1 1 1 1 D 1 1 size 1 1 Vd 0 1 0 F 1 Q 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
1 1 1 1 0 0 1 1 1 D 1 1 size 1 1 Vd 0 1 0 F 1 Q M 0 Vm
if Q == ‘1’ && (Vd == ‘1’ || Vm == ‘1’) then UNDEFINED;
if size != ‘10’ then UNDEFINED;
floating_point = (F == ‘1’); esize = 32; elements = 2;
d = UInt(D:Vd); m = UInt(M:Vm); regs = if Q == ‘0’ then 1 else 2;
A8-742 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B