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ARM Compiler armasm User Guide : LD2 (vector, single structure)

LD2 (vector, single structure)

Load single 2-element structure to one lane of two registers.

Syntax

LD2 { Vt.B, Vt2.B }[index], [Xn|SP] ; 8-bit

LD2 { Vt.H, Vt2.H }[index], [Xn|SP] ; 16-bit

LD2 { Vt.S, Vt2.S }[index], [Xn|SP] ; 32-bit

LD2 { Vt.D, Vt2.D }[index], [Xn|SP] ; 64-bit

LD2 { Vt.B, Vt2.B }[index], [Xn|SP], #2 ; 8-bit, immediate offset, Post-index

LD2 { Vt.B, Vt2.B }[index], [Xn|SP], Xm ; 8-bit, register offset, Post-index

LD2 { Vt.H, Vt2.H }[index], [Xn|SP], #4 ; 16-bit, immediate offset, Post-index

LD2 { Vt.H, Vt2.H }[index], [Xn|SP], Xm ; 16-bit, register offset, Post-index

LD2 { Vt.S, Vt2.S }[index], [Xn|SP], #8 ; 32-bit, immediate offset, Post-index

LD2 { Vt.S, Vt2.S }[index], [Xn|SP], Xm ; 32-bit, register offset, Post-index

LD2 { Vt.D, Vt2.D }[index], [Xn|SP], #16 ; 64-bit, immediate offset, Post-index

LD2 { Vt.D, Vt2.D }[index], [Xn|SP], Xm ; 64-bit, register offset, Post-index

Where:

Vt

Is the name of the first or only SIMD and FP register to be transferred.

Vt2

Is the name of the second SIMD and FP register to be transferred.

index

The value depends on the instruction variant:

8-bit
Is the element index, in the range 0 to 15
16-bit
Is the element index, in the range 0 to 7
32-bit
Is the element index, in the range 0 to 3
64-bit
Is the element index, and can be either 0 or 1
Xn|SP

Is the 64-bit name of the general-purpose base register or stack pointer.

Xm

Is the 64-bit name of the general-purpose post-index register, excluding XZR.

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