20.27 DUP (vector, element)

vector.

Syntax

DUP Vd.T, Vn.Ts[index]

Where:

Vd
Is the name of the SIMD and FP destination register.
T
Is an arrangement specifier, and can be one of the values shown in Usage.
Ts
Is an element size specifier, and can be one of the values shown in Usage.
Vn
Is the name of the SIMD and FP source register.
index
Is the element index, in the range shown in Usage.

Usage

Duplicate vector element to vector or scalar. This instruction duplicates the vector element at the specified element index in the source SIMD and FP register into a scalar or each element in a vector, and writes the result to the destination SIMD and FP register.

Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

The following table shows the valid specifier combinations:

Table 20-4 DUP (Vector) specifier combinations

T Ts index
8B B 0 to 15
16B B 0 to 15
4H H 0 to 7
8H H 0 to 7
2S S 0 to 3
4S S 0 to 3
2D D 0 or 1
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