20.212 ST2 (vector, single structure)

Store single 2-element structure from one lane of two registers.

Syntax

ST2 { Vt.B, Vt2.B }[index], [Xn|SP] ; T2

ST2 { Vt.H, Vt2.H }[index], [Xn|SP] ; T2

ST2 { Vt.S, Vt2.S }[index], [Xn|SP] ; T2

ST2 { Vt.D, Vt2.D }[index], [Xn|SP] ; T2

ST2 { Vt.B, Vt2.B }[index], [Xn|SP], #2 ; T2

ST2 { Vt.B, Vt2.B }[index], [Xn|SP], Xm ; T2

ST2 { Vt.H, Vt2.H }[index], [Xn|SP], #4 ; T2

ST2 { Vt.H, Vt2.H }[index], [Xn|SP], Xm ; T2

ST2 { Vt.S, Vt2.S }[index], [Xn|SP], #8 ; T2

ST2 { Vt.S, Vt2.S }[index], [Xn|SP], Xm ; T2

ST2 { Vt.D, Vt2.D }[index], [Xn|SP], #16 ; T2

ST2 { Vt.D, Vt2.D }[index], [Xn|SP], Xm ; T2

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.

Usage

Store single 2-element structure from one lane of two registers. This instruction stores a 2-element structure to memory from corresponding elements of two SIMD and FP registers.

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.

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