std_detect: Add aarch64/linux/LLVM features

Add detection for various aarch64 CPU features already supported by LLVM and Linux.

This commit adds feature detection for the following features:

- FEAT_CSSC
- FEAT_ECV
- FEAT_FAMINMAX
- FEAT_FLAGM2
- FEAT_FP8
- FEAT_FP8DOT2
- FEAT_FP8DOT4
- FEAT_FP8FMA
- FEAT_HBC
- FEAT_LSE128
- FEAT_LUT
- FEAT_MOPS
- FEAT_LRCPC3
- FEAT_SVE_B16B16
- FEAT_SVE2p1
- FEAT_WFxT

It also adds feature detection for FEAT_FPMR. It is somewhat of a
special case because FPMR only exists as a feature in LLVM 18, it has
been removed from the LLVM upstream. On that account the intention is
for it to be detectable at runtime through stdarch but not have a
corresponding compile-time Rust target feature.

Linux features: https://github.com/torvalds/linux/blob/master/arch/arm64/include/uapi/asm/hwcap.h
LLVM features: llvm-project/llvm/lib/Target/AArch64/AArch64.td

2 files changed, 19 insertions, 0 deletions

diff --git a/library/stdarch/crates/std_detect/tests/cpu-detection.rs b/library/stdarch/crates/std_detect/tests/cpu-detection.rs
index 615268e8768..b43449c7f6f 100644
--- a/library/stdarch/crates/std_detect/tests/cpu-detection.rs
+++ b/library/stdarch/crates/std_detect/tests/cpu-detection.rs
@@ -1,6 +1,7 @@
 #![allow(internal_features)]
 #![feature(stdarch_internal)]
 #![cfg_attr(target_arch = "arm", feature(stdarch_arm_feature_detection))]
+#![cfg_attr(target_arch = "aarch64", feature(stdarch_aarch64_feature_detection))]
 #![cfg_attr(target_arch = "powerpc", feature(stdarch_powerpc_feature_detection))]
 #![cfg_attr(target_arch = "powerpc64", feature(stdarch_powerpc_feature_detection))]
 #![cfg_attr(
@@ -67,21 +68,26 @@ fn aarch64_linux() {
     println!("crc: {}", is_aarch64_feature_detected!("crc"));
     println!("lse: {}", is_aarch64_feature_detected!("lse"));
     println!("lse2: {}", is_aarch64_feature_detected!("lse2"));
+    println!("lse128: {}", is_aarch64_feature_detected!("lse128"));
     println!("rdm: {}", is_aarch64_feature_detected!("rdm"));
     println!("rcpc: {}", is_aarch64_feature_detected!("rcpc"));
     println!("rcpc2: {}", is_aarch64_feature_detected!("rcpc2"));
+    println!("rcpc3: {}", is_aarch64_feature_detected!("rcpc3"));
     println!("dotprod: {}", is_aarch64_feature_detected!("dotprod"));
     println!("tme: {}", is_aarch64_feature_detected!("tme"));
     println!("fhm: {}", is_aarch64_feature_detected!("fhm"));
     println!("dit: {}", is_aarch64_feature_detected!("dit"));
     println!("flagm: {}", is_aarch64_feature_detected!("flagm"));
+    println!("flagm2: {}", is_aarch64_feature_detected!("flagm2"));
     println!("ssbs: {}", is_aarch64_feature_detected!("ssbs"));
     println!("sb: {}", is_aarch64_feature_detected!("sb"));
     println!("paca: {}", is_aarch64_feature_detected!("paca"));
     println!("pacg: {}", is_aarch64_feature_detected!("pacg"));
     println!("dpb: {}", is_aarch64_feature_detected!("dpb"));
     println!("dpb2: {}", is_aarch64_feature_detected!("dpb2"));
+    println!("sve-b16b16: {}", is_aarch64_feature_detected!("sve-b16b16"));
     println!("sve2: {}", is_aarch64_feature_detected!("sve2"));
+    println!("sve2p1: {}", is_aarch64_feature_detected!("sve2p1"));
     println!("sve2-aes: {}", is_aarch64_feature_detected!("sve2-aes"));
     println!("sve2-sm4: {}", is_aarch64_feature_detected!("sve2-sm4"));
     println!("sve2-sha3: {}", is_aarch64_feature_detected!("sve2-sha3"));
@@ -103,6 +109,18 @@ fn aarch64_linux() {
     println!("sha2: {}", is_aarch64_feature_detected!("sha2"));
     println!("sha3: {}", is_aarch64_feature_detected!("sha3"));
     println!("sm4: {}", is_aarch64_feature_detected!("sm4"));
+    println!("hbc: {}", is_aarch64_feature_detected!("hbc"));
+    println!("mops: {}", is_aarch64_feature_detected!("mops"));
+    println!("ecv: {}", is_aarch64_feature_detected!("ecv"));
+    println!("cssc: {}", is_aarch64_feature_detected!("cssc"));
+    println!("fpmr: {}", is_aarch64_feature_detected!("fpmr"));
+    println!("lut: {}", is_aarch64_feature_detected!("lut"));
+    println!("faminmax: {}", is_aarch64_feature_detected!("faminmax"));
+    println!("fp8: {}", is_aarch64_feature_detected!("fp8"));
+    println!("fp8fma: {}", is_aarch64_feature_detected!("fp8fma"));
+    println!("fp8dot4: {}", is_aarch64_feature_detected!("fp8dot4"));
+    println!("fp8dot2: {}", is_aarch64_feature_detected!("fp8dot2"));
+    println!("wfxt: {}", is_aarch64_feature_detected!("wfxt"));
 }
 
 #[test]
diff --git a/library/stdarch/crates/std_detect/tests/macro_trailing_commas.rs b/library/stdarch/crates/std_detect/tests/macro_trailing_commas.rs
index 1d1ed4d3868..9f6ef074d00 100644
--- a/library/stdarch/crates/std_detect/tests/macro_trailing_commas.rs
+++ b/library/stdarch/crates/std_detect/tests/macro_trailing_commas.rs
@@ -12,6 +12,7 @@
     feature(stdarch_internal)
 )]
 #![cfg_attr(target_arch = "arm", feature(stdarch_arm_feature_detection))]
+#![cfg_attr(target_arch = "aarch64", feature(stdarch_aarch64_feature_detection))]
 #![cfg_attr(target_arch = "powerpc", feature(stdarch_powerpc_feature_detection))]
 #![cfg_attr(target_arch = "powerpc64", feature(stdarch_powerpc_feature_detection))]
 #![allow(clippy::unwrap_used, clippy::use_debug, clippy::print_stdout)]