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UMADDL

Unsigned Multiply-Add Long multiplies two 32-bit register values, adds a 64-bit register value, and writes the result to the 64-bit destination register.

This instruction is used by the alias UMULL.

313029282726252423222120191817161514131211109876543210
10011011101Rm0RaRnRd
Uo0

64-bit

UMADDL <Xd>, <Wn>, <Wm>, <Xa>

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

Assembler Symbols

<Xd>

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

<Wn>

Is the 32-bit name of the first general-purpose source register holding the multiplicand, encoded in the "Rn" field.

<Wm>

Is the 32-bit name of the second general-purpose source register holding the multiplier, encoded in the "Rm" field.

<Xa>

Is the 64-bit name of the third general-purpose source register holding the addend, encoded in the "Ra" field.

Alias Conditions

AliasIs preferred when
UMULLRa == '11111'

Operation

bits(32) operand1 = X[n];
bits(32) operand2 = X[m];
bits(64) operand3 = X[a];

integer result;

result = Int(operand3, TRUE) + (Int(operand1, TRUE) * Int(operand2, TRUE));

X[d] = result<63:0>;

Operational information

If PSTATE.DIT is 1:

  • The execution time of this instruction is independent of:
    • The values of the data supplied in any of its registers.
    • The values of the NZCV flags.
  • The response of this instruction to asynchronous exceptions does not vary based on:
    • The values of the data supplied in any of its registers.
    • The values of the NZCV flags.
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