# acle

**Repository Path**: mirrors_ARM-software/acle

## Basic Information

- **Project Name**: acle
- **Description**: Arm C Language Extensions (ACLE)
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: main
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-03-12
- **Last Updated**: 2026-09-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

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# Arm C Language Extensions

This repository contains the source material from which the
specifications for the Arm C Language Extensions (ACLE) are derived.

Browse the current specifications on the
[ACLE website](https://arm-software.github.io/acle/).

## Versioning

Arm no longer publishes quarterly specification releases. We publish the current
specification after each reviewed change merges into branch `main`. This
process gives users earlier access to new features, clarifications, and
corrections.

The PDF versions of the documents can be retrieved from the
[releases](https://github.com/ARM-software/acle/releases) page.

Branch `main` contains the current ACLE specification and ongoing development.

## Legacy releases

The [releases](https://github.com/ARM-software/acle/releases) page also contains
the legacy quarterly releases through 2026Q1.

Pre-GitHub versions of the documents were previously released on
[Arm Developer](https://developer.arm.com), and are also hosted in this
repository, in [Legacy releases](legacyreleases/README.md).

## Contributing

Contributions of any kind are always welcome! Please check the
[contribution guidelines](CONTRIBUTING.md) for details.

## Defect reports

Please report defects in or enhancements to the specifications in this folder to
the [issue tracker page on
GitHub](https://github.com/ARM-software/acle/issues).

For reporting defects or enhancements to documents that currently are not yet
included in this repo and are thus only hosted on developer.arm.com, please send
an email to arm.acle@arm.com.

## List of documents

[Arm C Language Extensions](https://arm-software.github.io/acle/main/)

[Morello Supplement to the Arm C Language Extensions](https://arm-software.github.io/acle/morello/)

[Arm MVE Intrinsics](https://arm-software.github.io/acle/mve_intrinsics/)

[Arm Neon Intrinsics Reference](https://arm-software.github.io/acle/neon_intrinsics/)

[Arm®v8-M Security Extensions - Requirements on Development Tools](https://arm-software.github.io/acle/cmse/)

The PDF versions can be found in the latest GitHub
[release](https://github.com/ARM-software/acle/releases/latest).

# License

All the open-source ACLE documents are licensed under the Creative
Commons Attribution-ShareAlike 4.0 International License + grant
of Patent License.

The closed-source [legacy ACLE releases](legacyreleases/README.md) are
licensed under an Arm proprietary license.

For more information see [LICENSE](LICENSE.md).

## Past contributors

The [list below](#contributors) represents the list of people that
have been contributing since July 2021, when the ACLE specifications
were released with an open source license.

However, the ACLE is a collective project that was started a few years
ago, and that since then has seen the contribution of many people
before it was released as an open source project.

## Contributors ✨

Thanks go to these wonderful people ([emoji key](https://allcontributors.org/en/reference/emoji-key/)):

<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
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<table>
  <tbody>
    <tr>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/TamarChristinaArm"><img src="https://avatars.githubusercontent.com/u/48126768?v=4?s=100" width="100px;" alt="Tamar Christina"/><br /><sub><b>Tamar Christina</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=TamarChristinaArm" title="Code">💻</a> <a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3ATamarChristinaArm" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/MattPD"><img src="https://avatars.githubusercontent.com/u/130135?v=4?s=100" width="100px;" alt="Matt"/><br /><sub><b>Matt</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=MattPD" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/ValeriaDaneva"><img src="https://avatars.githubusercontent.com/u/90907783?v=4?s=100" width="100px;" alt="ValeriaDaneva"/><br /><sub><b>ValeriaDaneva</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=ValeriaDaneva" title="Code">💻</a> <a href="#infra-ValeriaDaneva" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3AValeriaDaneva" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="http://tubafranz.me/"><img src="https://avatars.githubusercontent.com/u/25690309?v=4?s=100" width="100px;" alt="Francesco Petrogalli"/><br /><sub><b>Francesco Petrogalli</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=fpetrogalli" title="Code">💻</a> <a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Afpetrogalli" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><img src="https://avatars.githubusercontent.com/u/74917949?v=4?s=100" width="100px;" alt="ktkachov-arm"/><br /><sub><b>ktkachov-arm</b></sub><br /><a href="https://github.com/ARM-software/acle/commits?author=ktkachov-arm" title="Code">💻</a> <a href="#content-ktkachov-arm" title="Content">🖋</a> <a href="#infra-ktkachov-arm" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Aktkachov-arm" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/sallyarmneale"><img src="https://avatars.githubusercontent.com/u/56446080?v=4?s=100" width="100px;" alt="sallyarmneale"/><br /><sub><b>sallyarmneale</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Asallyarmneale" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/statham-arm"><img src="https://avatars.githubusercontent.com/u/54840944?v=4?s=100" width="100px;" alt="Simon Tatham"/><br /><sub><b>Simon Tatham</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Astatham-arm" title="Reviewed Pull Requests">👀</a></td>
    </tr>
    <tr>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/sam-ellis"><img src="https://avatars.githubusercontent.com/u/6695726?v=4?s=100" width="100px;" alt="Sam Ellis"/><br /><sub><b>Sam Ellis</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Asam-ellis" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/ARM-software/acle/commits?author=sam-ellis" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/kbeyls"><img src="https://avatars.githubusercontent.com/u/19591946?v=4?s=100" width="100px;" alt="Kristof Beyls"/><br /><sub><b>Kristof Beyls</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Akbeyls" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/sbaranga-arm"><img src="https://avatars.githubusercontent.com/u/24250117?v=4?s=100" width="100px;" alt="sbaranga-arm"/><br /><sub><b>sbaranga-arm</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=sbaranga-arm" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/avieira-arm"><img src="https://avatars.githubusercontent.com/u/68072104?v=4?s=100" width="100px;" alt="Andre Vieira"/><br /><sub><b>Andre Vieira</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=avieira-arm" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/tejas-belagod-arm"><img src="https://avatars.githubusercontent.com/u/92718852?v=4?s=100" width="100px;" alt="tejas-belagod-arm"/><br /><sub><b>tejas-belagod-arm</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=tejas-belagod-arm" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/JamieCunliffe"><img src="https://avatars.githubusercontent.com/u/29557119?v=4?s=100" width="100px;" alt="Jamie Cunliffe"/><br /><sub><b>Jamie Cunliffe</b></sub></a><br /><a href="https://github.com/ARM-software/acle/issues?q=author%3AJamieCunliffe" title="Bug reports">🐛</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/georges-arm"><img src="https://avatars.githubusercontent.com/u/93212071?v=4?s=100" width="100px;" alt="George Steed"/><br /><sub><b>George Steed</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=georges-arm" title="Code">💻</a> <a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Ageorges-arm" title="Reviewed Pull Requests">👀</a></td>
    </tr>
    <tr>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/peterwaller-arm"><img src="https://avatars.githubusercontent.com/u/52030119?v=4?s=100" width="100px;" alt="Peter Waller"/><br /><sub><b>Peter Waller</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Apeterwaller-arm" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/MDevereau"><img src="https://avatars.githubusercontent.com/u/81567778?v=4?s=100" width="100px;" alt="Matthew Devereau"/><br /><sub><b>Matthew Devereau</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=MDevereau" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/rsandifo-arm"><img src="https://avatars.githubusercontent.com/u/28043039?v=4?s=100" width="100px;" alt="rsandifo-arm"/><br /><sub><b>rsandifo-arm</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Arsandifo-arm" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/ARM-software/acle/commits?author=rsandifo-arm" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/rearnsha"><img src="https://avatars.githubusercontent.com/u/57798236?v=4?s=100" width="100px;" alt="rearnsha"/><br /><sub><b>rearnsha</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Arearnsha" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://davidben.net"><img src="https://avatars.githubusercontent.com/u/109690?v=4?s=100" width="100px;" alt="David Benjamin"/><br /><sub><b>David Benjamin</b></sub></a><br /><a href="https://github.com/ARM-software/acle/issues?q=author%3Adavidben" title="Bug reports">🐛</a> <a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Adavidben" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/DanielKristofKiss"><img src="https://avatars.githubusercontent.com/u/4526629?v=4?s=100" width="100px;" alt="Dani"/><br /><sub><b>Dani</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=DanielKristofKiss" title="Code">💻</a> <a href="#infra-DanielKristofKiss" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/stuij"><img src="https://avatars.githubusercontent.com/u/192309?v=4?s=100" width="100px;" alt="Ties Stuij"/><br /><sub><b>Ties Stuij</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Astuij" title="Reviewed Pull Requests">👀</a></td>
    </tr>
    <tr>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/sdesmalen-arm"><img src="https://avatars.githubusercontent.com/u/36851054?v=4?s=100" width="100px;" alt="sdesmalen-arm"/><br /><sub><b>sdesmalen-arm</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Asdesmalen-arm" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/bryanpkc"><img src="https://avatars.githubusercontent.com/u/7143326?v=4?s=100" width="100px;" alt="Bryan Chan"/><br /><sub><b>Bryan Chan</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Abryanpkc" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/pthariensflame"><img src="https://avatars.githubusercontent.com/u/1847577?v=4?s=100" width="100px;" alt="Laine Taffin Altman"/><br /><sub><b>Laine Taffin Altman</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Apthariensflame" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/sagarkulkarni19"><img src="https://avatars.githubusercontent.com/u/24480535?v=4?s=100" width="100px;" alt="Sagar Kulkarni"/><br /><sub><b>Sagar Kulkarni</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Asagarkulkarni19" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://www.linkedin.com/in/vhscampos"><img src="https://avatars.githubusercontent.com/u/3412620?v=4?s=100" width="100px;" alt="Victor Campos"/><br /><sub><b>Victor Campos</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=vhscampos" title="Documentation">📖</a> <a href="https://github.com/ARM-software/acle/commits?author=vhscampos" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/ilinpv"><img src="https://avatars.githubusercontent.com/u/61020334?v=4?s=100" width="100px;" alt="Pavel Iliin"/><br /><sub><b>Pavel Iliin</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Ailinpv" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://lenary.co.uk"><img src="https://avatars.githubusercontent.com/u/14548?v=4?s=100" width="100px;" alt="Sam Elliott"/><br /><sub><b>Sam Elliott</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Alenary" title="Reviewed Pull Requests">👀</a> <a href="https://github.com/ARM-software/acle/commits?author=lenary" title="Code">💻</a></td>
    </tr>
    <tr>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/bwmf2"><img src="https://avatars.githubusercontent.com/u/117049336?v=4?s=100" width="100px;" alt="bwmf2"/><br /><sub><b>bwmf2</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=bwmf2" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><img src="https://avatars.githubusercontent.com/u/76168689?v=4?s=100" width="100px;" alt="tmatheson-arm"/><br /><sub><b>tmatheson-arm</b></sub><br /><a href="https://github.com/ARM-software/acle/commits?author=tmatheson-arm" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://atrosinenko.github.io"><img src="https://avatars.githubusercontent.com/u/9654772?v=4?s=100" width="100px;" alt="Anatoly Trosinenko"/><br /><sub><b>Anatoly Trosinenko</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=atrosinenko" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/pratlucas"><img src="https://avatars.githubusercontent.com/u/7014318?v=4?s=100" width="100px;" alt="Lucas Duarte Prates"/><br /><sub><b>Lucas Duarte Prates</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=pratlucas" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><img src="https://avatars.githubusercontent.com/u/11681428?v=4?s=100" width="100px;" alt="Andrew Carlotti"/><br /><sub><b>Andrew Carlotti</b></sub><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Aandrewcarlotti" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/labrinea"><img src="https://avatars.githubusercontent.com/u/9527365?v=4?s=100" width="100px;" alt="Alexandros Lamprineas"/><br /><sub><b>Alexandros Lamprineas</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=labrinea" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/Lukacma"><img src="https://avatars.githubusercontent.com/u/46606997?v=4?s=100" width="100px;" alt="Lukacma"/><br /><sub><b>Lukacma</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=Lukacma" title="Documentation">📖</a></td>
    </tr>
    <tr>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/v01dXYZ"><img src="https://avatars.githubusercontent.com/u/14996868?v=4?s=100" width="100px;" alt="Robert Dazi"/><br /><sub><b>Robert Dazi</b></sub></a><br /><a href="#content-v01dXYZ" title="Content">🖋</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/SpencerAbson"><img src="https://avatars.githubusercontent.com/u/76910239?v=4?s=100" width="100px;" alt="SpencerAbson"/><br /><sub><b>SpencerAbson</b></sub></a><br /><a href="#content-SpencerAbson" title="Content">🖋</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/philgee-oss"><img src="https://avatars.githubusercontent.com/u/56538781?v=4?s=100" width="100px;" alt="philgee-oss"/><br /><sub><b>philgee-oss</b></sub></a><br /><a href="https://github.com/ARM-software/acle/pulls?q=is%3Apr+reviewed-by%3Aphilgee-oss" title="Reviewed Pull Requests">👀</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/kmclaughlin-arm"><img src="https://avatars.githubusercontent.com/u/56965690?v=4?s=100" width="100px;" alt="Kerry McLaughlin"/><br /><sub><b>Kerry McLaughlin</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=kmclaughlin-arm" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/momchil-velikov"><img src="https://avatars.githubusercontent.com/u/5541560?v=4?s=100" width="100px;" alt="Momchil Velikov"/><br /><sub><b>Momchil Velikov</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=momchil-velikov" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/yury-khrustalev"><img src="https://avatars.githubusercontent.com/u/47541527?v=4?s=100" width="100px;" alt="Yury Khrustalev"/><br /><sub><b>Yury Khrustalev</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=yury-khrustalev" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://rdfm.org/"><img src="https://avatars.githubusercontent.com/u/111884?v=4?s=100" width="100px;" alt="Claudio Bantaloukas"/><br /><sub><b>Claudio Bantaloukas</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=rockdreamer" title="Code">💻</a></td>
    </tr>
    <tr>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/AlfieRichardsArm"><img src="https://avatars.githubusercontent.com/u/156316945?v=4?s=100" width="100px;" alt="Alfie Richards"/><br /><sub><b>Alfie Richards</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=AlfieRichardsArm" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/MartinWehking"><img src="https://avatars.githubusercontent.com/u/9721817?v=4?s=100" width="100px;" alt="Martin Wehking"/><br /><sub><b>Martin Wehking</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=MartinWehking" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/CarolineConcatto"><img src="https://avatars.githubusercontent.com/u/51754594?v=4?s=100" width="100px;" alt="CarolineConcatto"/><br /><sub><b>CarolineConcatto</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=CarolineConcatto" title="Code">💻</a></td>
      <td align="center" valign="top" width="14.28%"><a href="https://github.com/amilendra"><img src="https://avatars.githubusercontent.com/u/10149464?v=4?s=100" width="100px;" alt="amilendra"/><br /><sub><b>amilendra</b></sub></a><br /><a href="#content-amilendra" title="Content">🖋</a></td>
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</table>

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<!-- ALL-CONTRIBUTORS-LIST:END -->

This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!