ARM Compiler armasm User Guide : 16.170 UMULH

16.170 UMULH

Unsigned Multiply High.

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.

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 = bits<127:64> of Xn * Xm.

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