VEXT (Vector Extract) extracts 8-bit elements
from the bottom end of the second operand vector and the top end
of the first, concatenates them, and places the result in the destination
vector. See Figure 6 for
an example.
Syntax
VEXT{cond}.8 {Qd}, Qn, Qm, #imm
VEXT{cond}.8 {Dd}, Dn, Dm, #imm
where:
condis an optional condition code.
Qd, Qn, Qmspecifies the destination register, the first operand register, and the second operand register, for a quadword operation.
Dd, Dn, Dmspecifies the destination register, the first operand register, and the second operand register, for a doubleword operation.
immis the number of 8-bit elements to extract from the bottom of the second operand vector, in the range 0-7 for doubleword operations, or 0-15 for quadword operations.
You can specify a datatype of 16, 32, or 64 instead of 8.
In this case, #imm refers to halfwords, words,
or doublewords instead of referring to bytes, and the permitted
ranges are correspondingly reduced.
- Reference:
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