std_detect: Remove support for arm crypto target feature

Author: taiki-e

crates/std_detect/src/detect/arch/arm.rs

@@ -17,8 +17,6 @@ features! {
     /// Polynomial Multiply
     @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] crc: "crc";
     /// CRC32 (Cyclic Redundancy Check)
-    @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] crypto: "crypto";
-    /// Crypto: AES + PMULL + SHA1 + SHA256. Prefer using the individual features where possible.
     @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] aes: "aes";
     /// FEAT_AES (AES instructions)
     @FEATURE: #[unstable(feature = "stdsimd", issue = "27731")] sha2: "sha2";

crates/std_detect/src/detect/os/freebsd/arm.rs

@@ -23,16 +23,13 @@ pub(crate) fn detect_features() -> cache::Initializer {
 
     if let Ok(auxv) = auxvec::auxv() {
         enable_feature(&mut value, Feature::neon, auxv.hwcap & HWCAP_NEON != 0);
-        let pmull = auxv.hwcap2 & HWCAP2_PMULL != 0;
-        enable_feature(&mut value, Feature::pmull, pmull);
+        enable_feature(&mut value, Feature::pmull, auxv.hwcap2 & HWCAP2_PMULL != 0);
         enable_feature(&mut value, Feature::crc, auxv.hwcap2 & HWCAP2_CRC32 != 0);
-        let aes = auxv.hwcap2 & HWCAP2_AES != 0;
-        enable_feature(&mut value, Feature::aes, aes);
+        enable_feature(&mut value, Feature::aes, auxv.hwcap2 & HWCAP2_AES != 0);
         // SHA2 requires SHA1 & SHA2 features
         let sha1 = auxv.hwcap2 & HWCAP2_SHA1 != 0;
         let sha2 = auxv.hwcap2 & HWCAP2_SHA2 != 0;
         enable_feature(&mut value, Feature::sha2, sha1 && sha2);
-        enable_feature(&mut value, Feature::crypto, aes && pmull && sha1 && sha2);
         return value;
     }
     value

crates/std_detect/src/detect/os/linux/arm.rs

@@ -20,14 +20,6 @@ pub(crate) fn detect_features() -> cache::Initializer {
         enable_feature(&mut value, Feature::neon, bit::test(auxv.hwcap, 12));
         enable_feature(&mut value, Feature::pmull, bit::test(auxv.hwcap2, 1));
         enable_feature(&mut value, Feature::crc, bit::test(auxv.hwcap2, 4));
-        enable_feature(
-            &mut value,
-            Feature::crypto,
-            bit::test(auxv.hwcap2, 0)
-                && bit::test(auxv.hwcap2, 1)
-                && bit::test(auxv.hwcap2, 2)
-                && bit::test(auxv.hwcap2, 3),
-        );
         enable_feature(&mut value, Feature::aes, bit::test(auxv.hwcap2, 0));
         // SHA2 requires SHA1 & SHA2 features
         enable_feature(
@@ -47,14 +39,6 @@ pub(crate) fn detect_features() -> cache::Initializer {
         );
         enable_feature(&mut value, Feature::pmull, c.field("Features").has("pmull"));
         enable_feature(&mut value, Feature::crc, c.field("Features").has("crc32"));
-        enable_feature(
-            &mut value,
-            Feature::crypto,
-            c.field("Features").has("aes")
-                && c.field("Features").has("pmull")
-                && c.field("Features").has("sha1")
-                && c.field("Features").has("sha2"),
-        );
         enable_feature(&mut value, Feature::aes, c.field("Features").has("aes"));
         enable_feature(
             &mut value,

crates/std_detect/tests/cpu-detection.rs

@@ -28,7 +28,6 @@ fn arm_linux_or_freebsd() {
     println!("neon: {}", is_arm_feature_detected!("neon"));
     println!("pmull: {}", is_arm_feature_detected!("pmull"));
     println!("crc: {}", is_arm_feature_detected!("crc"));
-    println!("crypto: {}", is_arm_feature_detected!("crypto"));
     println!("aes: {}", is_arm_feature_detected!("aes"));
     println!("sha2: {}", is_arm_feature_detected!("sha2"));
 }