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[FMV] Add support-level table and remove __ARM_ACLE_VERSION #441

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109 changes: 74 additions & 35 deletions main/acle.md
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Expand Up @@ -1499,32 +1499,8 @@ enclose them in parentheses if they are not simple constants.

## Testing for Arm C Language Extensions

`__ARM_ACLE` is defined as the version of this specification that is
implemented, formatted as `{YEAR}{QUARTER}{PATCH}`. The `YEAR` segment is
composed of 4 digits, the `QUARTER` segment is composed of 1 digit, and
the `PATCH` segment is also composed of 1 digit.

For example:

- An implementation based on the version 2023 Q2 of the ACLE with no
further patch releases will define `__ARM_ACLE` as `202320`.
- An implementation based on a hypothetical version 2024 Q3 of the ACLE
with two patch releases will define `__ARM_ACLE` as `202432`.

NOTE: Previously, the macro followed the previous versioning scheme and
was defined as `100 * major_version + minor_version`, which was the
version of this specification implemented. For instance, an implementation
implementing version 2.1 of the ACLE specification defined `__ARM_ACLE`
as `201`.

`__ARM_ACLE_VERSION(year, quarter, patch)` is defined to express a given
ACLE version. Returns with the version number in the same format as the
`__ARM_ACLE` does. Checking the minimum required ACLE version could be
written as:

``` c
#if __ARM_ACLE >= __ARM_ACLE_VERSION(2024, 1, 0)
```
`__ARM_ACLE` is defined to `1` to indicate that the implementation
supports the Arm C Language Extensions.

## Endianness

Expand Down Expand Up @@ -2711,7 +2687,7 @@ be found in [[BA]](#BA).
|---------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------|-------------|
| [`__ARM_32BIT_STATE`](#instruction-set-architecture-a32t32a64) | Code is for AArch32 state | 1 |
| [`__ARM_64BIT_STATE`](#instruction-set-architecture-a32t32a64) | Code is for AArch64 state | 1 |
| [`__ARM_ACLE`](#testing-for-arm-c-language-extensions) | Indicates ACLE implemented | 101 |
| [`__ARM_ACLE`](#testing-for-arm-c-language-extensions) | Indicates ACLE implemented | 1 |
| [`__ARM_ALIGN_MAX_PWR`](#alignment-of-static-objects) | Log of maximum alignment of static object | 20 |
| [`__ARM_ALIGN_MAX_STACK_PWR`](#alignment-of-stack-objects) | Log of maximum alignment of stack object | 3 |
| [`__ARM_ARCH`](#arm-architecture-level) | Arm architecture level | 7 |
Expand Down Expand Up @@ -2998,14 +2974,10 @@ following:
versioning mechanism described in this section is supported by the
compiler and it is enabled.

`__FUNCTION_MULTI_VERSIONING_SUPPORT_LEVEL` is defined to the currently supported
version of the ACLE. The value and the format are the same as the `__ARM_ACLE`.

For example, it can be implemented as:

``` c
#define __FUNCTION_MULTI_VERSIONING_SUPPORT_LEVEL __ARM_ACLE_VERSION(2024, 3, 0)
```
`__FUNCTION_MULTI_VERSIONING_SUPPORT_LEVEL` is defined to the Function
Multi Versioning support level implemented by the compiler. The value
corresponds to the support levels listed in
[Function Multi Versioning feature availability](#function-multi-versioning-feature-availability).

### Target version strings

Expand Down Expand Up @@ -3130,6 +3102,73 @@ The following table lists the architectures feature mapping for AArch64.

The tables are sorted by priority, starting from features of lowest priority ending with features of highest priority.

### Function Multi Versioning feature availability

The following table lists the Function Multi Versioning support level at
which each target version name became available.

A Function Multi Versioning target version name is supported when
`__HAVE_FUNCTION_MULTI_VERSIONING` is defined to `1` and
`__FUNCTION_MULTI_VERSIONING_SUPPORT_LEVEL` is greater than or equal to
the support level listed for that name.

Each new set of Function Multi Versioning target version names added
is assigned a new support level. The new support level is one greater
than the greatest support level already listed. All target version names
added in the same set use the same support level.

| **Name** | **Available from support level** |
| ------------- | -------------------------------- |
| default | 202210 |
| sha1 | 202210 |
| aes | 202210 |
| vmull | 202210 |
| rng | 202210 |
| flagm | 202210 |
| flagm2 | 202210 |
| lse | 202210 |
| dotprod | 202210 |
| rdm | 202210 |
| fp16 | 202210 |
| dit | 202210 |
| dpb | 202210 |
| dpb2 | 202210 |
| jscvt | 202210 |
| fcma | 202210 |
| frintts | 202210 |
| sve | 202210 |
| sve2 | 202210 |
| sme | 202210 |
| sb | 202210 |
| ssbs | 202210 |
| bti | 202210 |
| crc | 202240 |
| sha2 | 202240 |
| fp | 202240 |
| simd | 202240 |
| sm4 | 202240 |
| sha3 | 202240 |
| fp16fml | 202240 |
| rcpc | 202240 |
| rcpc2 | 202240 |
| i8mm | 202240 |
| bf16 | 202240 |
| f32mm | 202240 |
| f64mm | 202240 |
| sve2-aes | 202240 |
| sve2-bitperm | 202240 |
| sve2-sha3 | 202240 |
| sve2-sm4 | 202240 |
| memtag | 202240 |
| wfxt | 202240 |
| sme2 | 202240 |
| rcpc3 | 202320 |
| sme-f64f64 | 202320 |
| sme-i16i64 | 202320 |
| rdma | 202410 |
| mops | 202410 |
| cssc | 202520 |

### Dependencies

If a feature depends on another feature as defined by the following table then:
Expand Down
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