Page 345 - ARM 64 Bit Assembly Language

P. 345

Advanced SIMD instructions 335

• The type T3 may be b or h.
• Ts may be 8b, 16b, 4h, 8h, 2s,or 4s.
• T4 may be b, h,or s.
• Both immediates, index and index2, must be valid for the type of vector element speci-
ﬁed.
• INS Vd.T[index],Wn is an alias for MOV Vd.T[index],Wn.
• INS Vd.D[index],Xn is an alias for MOV Vd.2d[index],Xn.
• INS Vd.T[index],Vn.T[index2] in an alias for MOV Vd.T[index], Vn.T[index2].

10.3.2.2 Operations

Name Effect Description
mov Vd.T[x],Wn Vd.T [x]← Wn Copy least-signiﬁcant bits
from Wn to speciﬁed ele-
ment of Vd.
mov Vd.2d[x],Xn Vd.2d[x]← Xn Copy from Xn to speciﬁed
element of Vd.
mov Vd.T2[x],Vn.T2[x2] Vd.T [x]← Vn.T [x2] Copy element x2 from Vn
to element x of Vd.

smov Wd, Vn.T3[x] Wd ← signExtend(Vn[x]) Move sign-extended ele-
ment from Vn to Wd.
umov Wd, Vn.Ts[x] Wd ← zeroExtend(Vn[x]) Move zero-extended ele-
ment from Vn to Wd.
smov Xd, Vn.T4[x] Xd ← signExtend(Vn[x]) Move sign-extended ele-
ment from Vn to Xd.
umov Xd, Vn.d[x] Xd ← zeroExtend(Vn[x]) Move zero-extended ele-
ment from Vn to Xd.

10.3.2.3 Examples

1 mov v3.2s[1],v4.2s[0]
2 umov x3,v4.d[1]

10.3.3 Move immediate

These instructions are used to load immediate data into the vector registers:

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