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16.153 UMULH

Unsigned Multiply High.

Syntax

UMULH Xd, Xn, Xm

Where:

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.

Operation

Unsigned Multiply High multiplies two 64-bit register values, and writes bits[127:64] of the 128-bit result to the 64-bit destination register.

Xd = bits127:64 of Xn * Xm.

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