Index

UMULH

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.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 0 0 1 1 0 1 1 1 1 0 Rm 0 (1) (1) (1) (1) (1) Rn Rd
U Ra

UMULH <Xd>, <Xn>, <Xm>

integer d = UInt(Rd);
integer n = UInt(Rn);
integer m = UInt(Rm);

Assembler Symbols

<Xd>

Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.
<Xn>

Is the 64-bit name of the first general-purpose source register holding the multiplicand, encoded in the "Rn" field.
<Xm>

Is the 64-bit name of the second general-purpose source register holding the multiplier, encoded in the "Rm" field.

Operation

bits(64) operand1 = X[n, 64];
bits(64) operand2 = X[m, 64];

integer result;

result = Int(operand1, TRUE) * Int(operand2, TRUE);

X[d, 64] = result<127:64>;

Operational information

If PSTATE.DIT is 1: