Arm Compiler armasm User Guide : 16.169 UMSUBL

16.169 UMSUBL

Unsigned Multiply-Subtract Long.

This instruction is used by the alias UMNEGL.

Syntax

UMSUBL Xd, Wn, Wm, Xa

Where:

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

Operation

Unsigned Multiply-Subtract Long multiplies two 32-bit register values, subtracts the product from a 64-bit register value, and writes the result to the 64-bit destination register.

Xd = Xa - Wn * Wm.

Related references

16.168 UMNEGL

16.1 A64 instructions in alphabetical order

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