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MOVT -- AArch32

MOVT

Move Top writes an immediate value to the top halfword of the destination register. It does not affect the contents of the bottom halfword.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) .

A1

313029282726252423222120191817161514131211109876543210
!= 111100110100imm4Rdimm12
condH

Encoding

MOVT{<c>}{<q>} <Rd>, #<imm16>

Decode for this encoding

let d : integer = UInt(Rd); let imm16 : bits(16) = imm4::imm12; if d == 15 then UnpredictableProcedure(); end;

T1

15141312111098765432101514131211109876543210
11110i101100imm40imm3Rdimm8
o1

Encoding

MOVT{<c>}{<q>} <Rd>, #<imm16>

Decode for this encoding

let d : integer = UInt(Rd); let imm16 : bits(16) = imm4::i::imm3::imm8; // Armv8-A removes UNPREDICTABLE for R13 if d == 15 then UnpredictableProcedure(); end;

For more information about the CONSTRAINED UNPREDICTABLE behavior of this instruction, see Architectural Constraints on UNPREDICTABLE behaviors.

Assembler Symbols

<c>

See Standard assembler syntax fields.

<q>

See Standard assembler syntax fields.

<Rd>

Is the general-purpose destination register, encoded in the "Rd" field.

<imm16>

For the "A1" variant: is a 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm4:imm12" field.

For the "T1" variant: is a 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm4:i:imm3:imm8" field.

Operation

if ConditionPassed() then EncodingSpecificOperations(); R(d)[31:16] = imm16; // R[d]<15:0> unchanged end;

Operational information

This instruction is a data-independent-time instruction as described in About the DIT bit.


2025-09_rel_asl1 2026-03-12 12:57:38

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