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std_detect Darwin AArch64: add new-style detection for FEAT_CRC32

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Now that this feature has a standard identifier, Darwin has started exposing it accordingly, in addition to the existing less-standard way.  Check both, and enable the `crc` feature if either identifier for it is present to ensure backwards and forwards compatibility.
This commit is contained in:
Laine Taffin Altman
2025-09-09 22:27:37 -07:00
parent 60a5372753
commit d8cc5757ba
1 changed files with 3 additions and 2 deletions
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5
library/std_detect/src/detect/os/darwin/aarch64.rs
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@@ -37,12 +37,13 @@ pub(crate) fn detect_features() -> cache::Initializer {
// Armv8.0 features not using the standard identifiers
let fp = _sysctlbyname(c"hw.optional.floatingpoint");
let asimd = _sysctlbyname(c"hw.optional.AdvSIMD");
let crc = _sysctlbyname(c"hw.optional.armv8_crc32");
let crc_old = _sysctlbyname(c"hw.optional.armv8_crc32");
// Armv8 and Armv9 features using the standard identifiers
let aes = _sysctlbyname(c"hw.optional.arm.FEAT_AES");
let bf16 = _sysctlbyname(c"hw.optional.arm.FEAT_BF16");
let bti = _sysctlbyname(c"hw.optional.arm.FEAT_BTI");
let crc = _sysctlbyname(c"hw.optional.arm.FEAT_CRC32");
let cssc = _sysctlbyname(c"hw.optional.arm.FEAT_CSSC");
let dit = _sysctlbyname(c"hw.optional.arm.FEAT_DIT");
let dpb = _sysctlbyname(c"hw.optional.arm.FEAT_DPB");
@@ -111,7 +112,7 @@ pub(crate) fn detect_features() -> cache::Initializer {
enable_feature(Feature::asimd, asimd);
enable_feature(Feature::bf16, bf16);
enable_feature(Feature::bti, bti);
enable_feature(Feature::crc, crc);
enable_feature(Feature::crc, crc_old || crc);
enable_feature(Feature::cssc, cssc);
enable_feature(Feature::dit, dit);
enable_feature(Feature::dotprod, dotprod);