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Extend __ARM_FEATURE_ATOMICS for FEAT_LSE2 #478

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Extend __ARM_FEATURE_ATOMICS for FEAT_LSE2 #478

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10 changes: 7 additions & 3 deletions main/acle.md
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Expand Up @@ -178,6 +178,7 @@ See [Changelog for year 2026](#changelog-for-year-2026).
* Clarified interaction between SME keyword attributes and a common compiler
extension whereby type attributes can be inherited between subsequent
duplicate decls.
* Extended `__ARM_FEATURE_ATOMICS` to distinguish FEAT_LSE and FEAT_LSE2.

### Legacy changelog

Expand Down Expand Up @@ -1794,8 +1795,11 @@ extension is available on the target. It is undefined otherwise.

### Large System Extensions

`__ARM_FEATURE_ATOMICS` is defined if the Large System Extensions introduced in
the Armv8.1-A [[ARMARMv81]](#ARMARMv81) architecture are supported on this target.
`__ARM_FEATURE_ATOMICS` is defined to 1 if the Large System Extensions
introduced in the Armv8.1-A [[ARMARMv81]](#ARMARMv81) architecture are supported
on this target, and 2 if the Large System Extensions version 2 introduced in
the Armv8.4-A [[ARMARMv84]](#ARMARMv84) architecture are supported.
It is undefined otherwise.
Note: It is strongly recommended that standardized C11/C++11 atomics are used to
implement atomic operations in user code.

Expand Down Expand Up @@ -2709,7 +2713,7 @@ be found in [[BA]](#BA).
| [`__ARM_BF16_FORMAT_ALTERNATIVE`](#brain-16-bit-floating-point-support) | 16-bit brain floating-point, alternative format | 1 |
| [`__ARM_BIG_ENDIAN`](#endianness) | Memory is big-endian | 1 |
| [`__ARM_FEATURE_AES`](#aes-extension) | AES Crypto extension (Arm v8-A) | 1 |
| [`__ARM_FEATURE_ATOMICS`](#large-system-extensions) | Large System Extensions | 1 |
| [`__ARM_FEATURE_ATOMICS`](#large-system-extensions) | Large System Extensions (FEAT_LSE and FEAT_LSE2) | 2 |
| [`__ARM_FEATURE_BF16`](#brain-16-bit-floating-point-support) | 16-bit brain floating-point, vector instruction | 1 |
| [`__ARM_FEATURE_BTI_DEFAULT`](#branch-target-identification) | Branch Target Identification | 1 |
| [`__ARM_FEATURE_CDE`](#custom-datapath-extension) | Custom Datapath Extension | 0x01 |
Expand Down
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