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ARM Compiler armasm User Guide : STNP

STNP

Store Pair of Registers, with non-temporal hint.

Syntax

STNP Wt1, Wt2, [Xn|SP{, #imm}] ; 32-bit general registers, Signed offset

STNP Xt1, Xt2, [Xn|SP{, #imm}] ; 64-bit general registers, Signed offset

Where:

Wt1

Is the 32-bit name of the first general-purpose register to be transferred.

Wt2

Is the 32-bit name of the second general-purpose register to be transferred.

imm

Depends on the instruction variant:

32-bit general registers

Is the optional signed immediate byte offset, a multiple of 4 in the range -256 to 252, defaulting to 0.

64-bit general registers

Is the optional signed immediate byte offset, a multiple of 8 in the range -512 to 504, defaulting to 0.

Xt1

Is the 64-bit name of the first general-purpose register to be transferred.

Xt2

Is the 64-bit name of the second general-purpose register to be transferred.

Xn|SP

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

Usage

Store Pair of Registers, with non-temporal hint, calculates an address from a base register value and an immediate offset, and stores two 32-bit words or two 64-bit doublewords to the calculated address, from two registers. For information about memory accesses, see Load/Store addressing modes in the ARMv8-A Architecture Reference Manual. For information about Non-temporal pair instructions, see Load/Store Non-temporal pair in the ARMv8-A Architecture Reference Manual.

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