MOVK -- A64

This instruction moves an optionally-shifted 16-bit immediate value into a register, keeping other bits unchanged.

Decode for all variants of this encoding

if sf == '0' && hw[1] == '1' then EndOfDecode(Decode_UNDEF); end; let d : integer = UInt(Rd); let datasize : integer{} = 32 << UInt(sf); let imm : bits(16) = imm16; let pos : integer{} = UInt(hw) << 4;

Assembler Symbols

<Wd>	Is the 32-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.

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

Operation

var result : bits(datasize) = X{}(d); result[pos+15:pos] = imm; X{datasize}(d) = result;

2026-03_rel 2026-03-26 20:48:11

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
sf	1	1	1	0	0	1	0	1	hw		imm16																Rd
	opc

MOVK

Encoding for the 32-bit variant

Encoding for the 64-bit variant

Decode for all variants of this encoding

Assembler Symbols

Operation