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MOVK

Move wide with keep moves an optionally-shifted 16-bit immediate value into a register, keeping other bits unchanged.

313029282726252423222120191817161514131211109876543210
sf11100101hwimm16Rd
opc

32-bit (sf == 0 && hw == 0x)

MOVK <Wd>, #<imm>{, LSL #<shift>}

64-bit (sf == 1)

MOVK <Xd>, #<imm>{, LSL #<shift>}

integer d = UInt(Rd);
integer datasize = if sf == '1' then 64 else 32;
integer pos;

if sf == '0' && hw<1> == '1' then UNDEFINED;
pos = UInt(hw:'0000');

Assembler Symbols

<Wd>

Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.

<Xd>

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

<imm>

Is the 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm16" field.

<shift>

For the 32-bit variant: is the amount by which to shift the immediate left, either 0 (the default) or 16, encoded in the "hw" field as <shift>/16.

For the 64-bit variant: is the amount by which to shift the immediate left, either 0 (the default), 16, 32 or 48, encoded in the "hw" field as <shift>/16.

Operation

bits(datasize) result;

result = X[d];
result<pos+15:pos> = imm16;
X[d] = result;

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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