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ARM Compiler armasm User Guide : MSUB

MSUB

Multiply-Subtract.

This instruction is used by the alias MNEG.

Syntax

MSUB Wd, Wn, Wm, Wa ; 32-bit general registers

MSUB Xd, Xn, Xm, Xa ; 64-bit general registers

Where:

Wd

Is the 32-bit name of the general-purpose destination register.

Wn

Is the 32-bit name of the first general-purpose source register holding the multiplicand.

Wm

Is the 32-bit name of the second general-purpose source register holding the multiplier.

Wa

Is the 32-bit name of the third general-purpose source register holding the minuend.

Xd

Is the 64-bit name of the general-purpose destination register.

Xn

Is the 64-bit name of the first general-purpose source register holding the multiplicand.

Xm

Is the 64-bit name of the second general-purpose source register holding the multiplier.

Xa

Is the 64-bit name of the third general-purpose source register holding the minuend.

Operation

Multiply-Subtract multiplies two register values, subtracts the product from a third register value, and writes the result to the destination register.

Rd = Ra - Rn * Rm, where R is either W or X.

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