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ARM Compiler armasm User Guide : LD1 (vector, single structure)

LD1 (vector, single structure)

Load single 1-element structure to one lane of one register.

Syntax

LD1 { Vt.B }[index], [Xn|SP] ; 8-bit

LD1 { Vt.H }[index], [Xn|SP] ; 16-bit

LD1 { Vt.S }[index], [Xn|SP] ; 32-bit

LD1 { Vt.D }[index], [Xn|SP] ; 64-bit

LD1 { Vt.B }[index], [Xn|SP], #1 ; 8-bit, immediate offset, Post-index

LD1 { Vt.B }[index], [Xn|SP], Xm ; 8-bit, register offset, Post-index

LD1 { Vt.H }[index], [Xn|SP], #2 ; 16-bit, immediate offset, Post-index

LD1 { Vt.H }[index], [Xn|SP], Xm ; 16-bit, register offset, Post-index

LD1 { Vt.S }[index], [Xn|SP], #4 ; 32-bit, immediate offset, Post-index

LD1 { Vt.S }[index], [Xn|SP], Xm ; 32-bit, register offset, Post-index

LD1 { Vt.D }[index], [Xn|SP], #8 ; 64-bit, immediate offset, Post-index

LD1 { Vt.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.

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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