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a pseudo-instruction or an alias a pseudo-instruction an alias

This is of . This means:

  • The encodings in this description are named to match the encodings of .
  • The assembler syntax is used only for assembly, and is not used on disassembly.
  • The description of gives the operational pseudocode, any constrained unpredictable behavior, and any operational information for this instruction.

Operation

The description of gives the operational pseudocode for this instruction.

Operational Information

The description of gives the operational information for this instruction.
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Base Instructions
SIMD&FP Instructions
A32 Instructions by Encoding
T32 Instructions by Encoding
Shared Pseudocode
Proprietary Notice

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

Copyright © 2010-2026 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.

. See orphan pseudocode for pseudocode which belongs to encodings but is not yet linked to instruction pages


: .

This instruction is used by the pseudo-instructions aliases and , pseudo-instruction alias .

Pseudocode

Library pseudocode for Pseudocode for encodings:

Symbols used in the pseudocode can be found in this diagram:

pseudocode

CONSTRAINED UNPREDICTABLE behavior

If , then one of the following behaviors must occur:
    • Error: unknown constraint: .


    ()

    Decode for this encoding

    Decode for all variants of this encoding

         , Arm ERROR

    Encoding for the variant Encoding
    ()

    Applies when ()

    is equivalent to

    and is always the preferred disassembly.

    but is never the preferred disassembly.

    and is the preferred disassembly when .

    // pseudocode ()

    This encoding should may (with deprecation) might (subject to ) be written using the alias mnemonic when . Write it as:

    Assembler Symbols
    #

    Alias Conditions

    Alias Of variant Is preferred when

    15141312111098765432101514131211109876543210 1514131211109876543210 313029282726252423222120191817161514131211109876543210
    lr lr l r
    droppedname

    • encoded in , based on : :

    -

    alias

    Alias Is preferred to (if ):

    encodings: When , the The instruction written:

    is equivalent to:

    .

    Operation

    Operational information

    For the , "" variants:

    Exceptions

    None.

    exceptions: , .

    • Note

     The following figure shows an example of the operation of .
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