Implemented runtime detection of xop target-feature

Author: sayantn

crates/std_detect/src/detect/arch/x86.rs

@@ -221,4 +221,6 @@ features! {
     /// MOVBE (Move Data After Swapping Bytes)
     @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] ermsb: "ermsb";
     /// ERMSB, Enhanced REP MOVSB and STOSB
+    @FEATURE: #[unstable(feature = "xop_target_feature", issue = "127208")] xop: "xop";
+    /// XOP: eXtended Operations (AMD)
 }

crates/std_detect/src/detect/os/x86.rs

@@ -264,6 +264,7 @@ pub(crate) fn detect_features() -> cache::Initializer {
             // These features are available on AMD arch CPUs:
             enable(extended_proc_info_ecx, 6, Feature::sse4a);
             enable(extended_proc_info_ecx, 21, Feature::tbm);
+            enable(extended_proc_info_ecx, 11, Feature::xop);
         }
     }
 

crates/std_detect/tests/cpu-detection.rs

@@ -3,6 +3,10 @@
 #![cfg_attr(target_arch = "arm", feature(stdarch_arm_feature_detection))]
 #![cfg_attr(target_arch = "powerpc", feature(stdarch_powerpc_feature_detection))]
 #![cfg_attr(target_arch = "powerpc64", feature(stdarch_powerpc_feature_detection))]
+#![cfg_attr(
+    any(target_arch = "x86", target_arch = "x86_64"),
+    feature(xop_target_feature)
+)]
 #![allow(clippy::unwrap_used, clippy::use_debug, clippy::print_stdout)]
 
 #[cfg_attr(
@@ -252,6 +256,7 @@ fn x86_all() {
     println!("xsaveopt: {:?}", is_x86_feature_detected!("xsaveopt"));
     println!("xsaves: {:?}", is_x86_feature_detected!("xsaves"));
     println!("xsavec: {:?}", is_x86_feature_detected!("xsavec"));
+    println!("xop: {:?}", is_x86_feature_detected!("xop"));
 }
 
 #[test]

crates/std_detect/tests/x86-specific.rs

@@ -1,6 +1,6 @@
 #![cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 #![allow(internal_features)]
-#![feature(stdarch_internal, avx512_target_feature)]
+#![feature(stdarch_internal, avx512_target_feature, xop_target_feature)]
 
 extern crate cupid;
 #[macro_use]
@@ -79,6 +79,7 @@ fn dump() {
         "avxvnniint16: {:?}",
         is_x86_feature_detected!("avxvnniint16")
     );
+    println!("xop: {:?}", is_x86_feature_detected!("xop"));
 }
 
 #[cfg(feature = "std_detect_env_override")]