Page 344 - ARM 64 Bit Assembly Language

334 Chapter 10

Name Effect Description
dup Vd.Td1,Wn Vd[] ← bits(Wn) Copy bitSize(Td1) least
significant bits of Wn to all
elements of Vd.
dup Vd.Td2,Vn.Ts[x] Vd[] ← Vn[x] Copy element x of Vn to all
elements of Vd.
dup Fd,Vn.Td3[x] Fd[] ← Vn[x] Copy element x of Vn to all
elements of Fd.

10.3.1.3 Examples

1 dup v0.8b,w1 // copy 8 bits from w1 to
2 // 8 8-bit elements of v0
3 dup v3.8h,V2.h[1] // copy second 16 bit half word
4 // from v2 to 8 16-bit elements of v3

10.3.2 Move vector element

These instructions copy one element into a vector:

mov Copy element into vector,
umov Copy unsigned integer element from vector to AARCH64 register, and
smov Copy signed integer element from vector to AARCH64 register.

10.3.2.1 Syntax

mov Vd.T[index], Wn
mov Vd.2d[index], Xn
mov Vd.T2[index], Vn.T2[index2]
smov Wd, Vn.T3[index]
umov Wd, Vn.Ts[index]
smov Xd, Vn.T4[index]
umov Xd, Vn.d[index]

• T may be 8b, 16b, 4h, 8h, 2s,or 4s.
• The lowest n bits of Wn will be used, where n is the number of bits specified by T.
• The type T2 may be b, h, s,or d.