Unsigned multiply high
This instruction 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 | ||||||||||||
| sf | op54 | U | o0 | Ra | |||||||||||||||||||||||||||
let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm);
| <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. |
let operand1 : bits(64) = X{}(n); let operand2 : bits(64) = X{}(m); let result : integer = UInt(operand1) * UInt(operand2); X{64}(d) = result[127:64];
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
2026-03_rel 2026-03-26 20:48:11
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