Page 355 - ARM 64 Bit Assembly Language

Advanced SIMD instructions 345

• Td/Ts may be 4s/4h or 2d/2s.
• Td2/Ts2 may be 4s/8h or 2d/4s.
• Td3/Ts3 may be 4h/4s or 2s/2d.
• Td4/Ts4 may be 8h/4s or 4s/2d.

10.4.2.2 Operations

Name Effect Description
fcvtl Vd[] ← single(Vn[]) Convert half precision to single
precision.
fcvtn Vd[] ← half (Vn[]) Convert single precision to half
precision.

fcvtxn Vd[] ← single(Vd[]) Convert double precision to single
precision.

10.4.2.3 Examples

1 fcvtl v0.2d,v1.2s // convert halfs to singles
2 fcvtxn v3.2s,v4.2d // convert doubles to singles

10.4.3 Round floating point to integer

The following instruction can be used to round a vector of floating point values to integers:

frint Round Floating Point to Integer.

10.4.3.1 Syntax

frint<x> Vd.T, Vn.T

• T is 2s, 4s,or 2d.
• <x> selects the rounding mode. It may be one of the following:
N: round to nearest with ties to even,
A: round to nearest with ties away from zero,
P: round towards +∞,
M: round towards −∞,
Z: round towards zero,
I: round using FPCR rounding mode, and
X: round using FPCR rounding mode with exactness test.