Added runtime detection

Cannot do a `cupid` test because they don't support `amx`.

Author: sayantn

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

@@ -84,6 +84,11 @@ features! {
     /// * `"avxneconvert"`
     /// * `"avxvnniint8"`
     /// * `"avxvnniint16"`
+    /// * `"amx-tile"`
+    /// * `"amx-int8"`
+    /// * `"amx-bf16"`
+    /// * `"amx-fp16"`
+    /// * `"amx-complex"`
     /// * `"f16c"`
     /// * `"fma"`
     /// * `"bmi1"`
@@ -196,6 +201,16 @@ features! {
     /// AVX-VNNI_INT8 (VNNI with 16-bit Integers)
     @FEATURE: #[unstable(feature = "avx512_target_feature", issue = "44839")] avxvnniint8: "avxvnniint8";
     /// AVX-VNNI_INT16 (VNNI with 8-bit integers)
+    @FEATURE: #[unstable(feature = "x86_amx_intrinsics", issue = "126622")] amx_tile: "amx-tile";
+    /// AMX (Advanced Matrix Extensions) - Tile load/store
+    @FEATURE: #[unstable(feature = "x86_amx_intrinsics", issue = "126622")] amx_int8: "amx-int8";
+    /// AMX-INT8 (Operations on 8-bit integers)
+    @FEATURE: #[unstable(feature = "x86_amx_intrinsics", issue = "126622")] amx_bf16: "amx-bf16";
+    /// AMX-BF16 (BFloat16 Operations)
+    @FEATURE: #[unstable(feature = "x86_amx_intrinsics", issue = "126622")] amx_fp16: "amx-fp16";
+    /// AMX-FP16 (Float16 Operations)
+    @FEATURE: #[unstable(feature = "x86_amx_intrinsics", issue = "126622")] amx_complex: "amx-complex";
+    /// AMX-COMPLEX (Complex number Operations)
     @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] f16c: "f16c";
     /// F16C (Conversions between IEEE-754 `binary16` and `binary32` formats)
     @FEATURE: #[stable(feature = "simd_x86", since = "1.27.0")] fma: "fma";

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

@@ -164,6 +164,7 @@ pub(crate) fn detect_features() -> cache::Initializer {
                 // * SSE -> `XCR0.SSE[1]`
                 // * AVX -> `XCR0.AVX[2]`
                 // * AVX-512 -> `XCR0.AVX-512[7:5]`.
+                // * AMX -> `XCR0.AMX[18:17]`
                 //
                 // by setting the corresponding bits of `XCR0` to `1`.
                 //
@@ -174,6 +175,8 @@ pub(crate) fn detect_features() -> cache::Initializer {
                 let os_avx_support = xcr0 & 6 == 6;
                 // Test `XCR0.AVX-512[7:5]` with the mask `0b1110_0000 == 0xe0`:
                 let os_avx512_support = xcr0 & 0xe0 == 0xe0;
+                // Test `XCR0.AMX[18:17]` with the mask `0b110_0000_0000_0000_0000 == 0x60000`
+                let os_amx_support = xcr0 & 0x60000 == 0x60000;
 
                 // Only if the OS and the CPU support saving/restoring the AVX
                 // registers we enable `xsave` support:
@@ -240,6 +243,14 @@ pub(crate) fn detect_features() -> cache::Initializer {
                         enable(extended_features_edx, 8, Feature::avx512vp2intersect);
                         enable(extended_features_edx, 23, Feature::avx512fp16);
                         enable(extended_features_eax_leaf_1, 5, Feature::avx512bf16);
+
+                        if os_amx_support {
+                            enable(extended_features_edx, 24, Feature::amx_tile);
+                            enable(extended_features_edx, 25, Feature::amx_int8);
+                            enable(extended_features_edx, 22, Feature::amx_bf16);
+                            enable(extended_features_eax_leaf_1, 21, Feature::amx_fp16);
+                            enable(extended_features_edx_leaf_1, 8, Feature::amx_complex);
+                        }
                     }
                 }
             }

crates/std_detect/tests/cpu-detection.rs

@@ -5,7 +5,7 @@
 #![cfg_attr(target_arch = "powerpc64", feature(stdarch_powerpc_feature_detection))]
 #![cfg_attr(
     any(target_arch = "x86", target_arch = "x86_64"),
-    feature(sha512_sm_x86)
+    feature(sha512_sm_x86, x86_amx_intrinsics)
 )]
 #![allow(clippy::unwrap_used, clippy::use_debug, clippy::print_stdout)]
 
@@ -259,6 +259,11 @@ 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!("amx-bf16: {:?}", is_x86_feature_detected!("amx-bf16"));
+    println!("amx-tile: {:?}", is_x86_feature_detected!("amx-tile"));
+    println!("amx-int8: {:?}", is_x86_feature_detected!("amx-int8"));
+    println!("amx-fp16: {:?}", is_x86_feature_detected!("amx-fp16"));
+    println!("amx-complex: {:?}", is_x86_feature_detected!("amx-complex"));
 }
 
 #[test]

crates/std_detect/tests/x86-specific.rs

@@ -1,6 +1,11 @@
 #![cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 #![allow(internal_features)]
-#![feature(stdarch_internal, avx512_target_feature, sha512_sm_x86)]
+#![feature(
+    stdarch_internal,
+    avx512_target_feature,
+    sha512_sm_x86,
+    x86_amx_intrinsics
+)]
 
 extern crate cupid;
 #[macro_use]
@@ -27,34 +32,34 @@ fn dump() {
     println!("sha512: {:?}", is_x86_feature_detected!("sha512"));
     println!("sm3: {:?}", is_x86_feature_detected!("sm3"));
     println!("sm4: {:?}", is_x86_feature_detected!("sm4"));
-    println!("avx512f {:?}", is_x86_feature_detected!("avx512f"));
-    println!("avx512cd {:?}", is_x86_feature_detected!("avx512cd"));
-    println!("avx512er {:?}", is_x86_feature_detected!("avx512er"));
-    println!("avx512pf {:?}", is_x86_feature_detected!("avx512pf"));
-    println!("avx512bw {:?}", is_x86_feature_detected!("avx512bw"));
-    println!("avx512dq {:?}", is_x86_feature_detected!("avx512dq"));
-    println!("avx512vl {:?}", is_x86_feature_detected!("avx512vl"));
-    println!("avx512_ifma {:?}", is_x86_feature_detected!("avx512ifma"));
+    println!("avx512f: {:?}", is_x86_feature_detected!("avx512f"));
+    println!("avx512cd: {:?}", is_x86_feature_detected!("avx512cd"));
+    println!("avx512er: {:?}", is_x86_feature_detected!("avx512er"));
+    println!("avx512pf: {:?}", is_x86_feature_detected!("avx512pf"));
+    println!("avx512bw: {:?}", is_x86_feature_detected!("avx512bw"));
+    println!("avx512dq: {:?}", is_x86_feature_detected!("avx512dq"));
+    println!("avx512vl: {:?}", is_x86_feature_detected!("avx512vl"));
+    println!("avx512_ifma: {:?}", is_x86_feature_detected!("avx512ifma"));
     println!("avx512vbmi {:?}", is_x86_feature_detected!("avx512vbmi"));
     println!(
-        "avx512_vpopcntdq {:?}",
+        "avx512_vpopcntdq: {:?}",
         is_x86_feature_detected!("avx512vpopcntdq")
     );
-    println!("avx512vbmi2 {:?}", is_x86_feature_detected!("avx512vbmi2"));
-    println!("gfni {:?}", is_x86_feature_detected!("gfni"));
-    println!("vaes {:?}", is_x86_feature_detected!("vaes"));
-    println!("vpclmulqdq {:?}", is_x86_feature_detected!("vpclmulqdq"));
-    println!("avx512vnni {:?}", is_x86_feature_detected!("avx512vnni"));
+    println!("avx512vbmi2: {:?}", is_x86_feature_detected!("avx512vbmi2"));
+    println!("gfni: {:?}", is_x86_feature_detected!("gfni"));
+    println!("vaes: {:?}", is_x86_feature_detected!("vaes"));
+    println!("vpclmulqdq: {:?}", is_x86_feature_detected!("vpclmulqdq"));
+    println!("avx512vnni: {:?}", is_x86_feature_detected!("avx512vnni"));
     println!(
-        "avx512bitalg {:?}",
+        "avx512bitalg: {:?}",
         is_x86_feature_detected!("avx512bitalg")
     );
-    println!("avx512bf16 {:?}", is_x86_feature_detected!("avx512bf16"));
+    println!("avx512bf16: {:?}", is_x86_feature_detected!("avx512bf16"));
     println!(
-        "avx512vp2intersect {:?}",
+        "avx512vp2intersect: {:?}",
         is_x86_feature_detected!("avx512vp2intersect")
     );
-    println!("avx512fp16 {:?}", is_x86_feature_detected!("avx512fp16"));
+    println!("avx512fp16: {:?}", is_x86_feature_detected!("avx512fp16"));
     println!("fma: {:?}", is_x86_feature_detected!("fma"));
     println!("abm: {:?}", is_x86_feature_detected!("abm"));
     println!("bmi: {:?}", is_x86_feature_detected!("bmi1"));
@@ -82,6 +87,11 @@ fn dump() {
         "avxvnniint16: {:?}",
         is_x86_feature_detected!("avxvnniint16")
     );
+    println!("amx-bf16: {:?}", is_x86_feature_detected!("amx-bf16"));
+    println!("amx-tile: {:?}", is_x86_feature_detected!("amx-tile"));
+    println!("amx-int8: {:?}", is_x86_feature_detected!("amx-int8"));
+    println!("amx-fp16: {:?}", is_x86_feature_detected!("amx-fp16"));
+    println!("amx-complex: {:?}", is_x86_feature_detected!("amx-complex"));
 }
 
 #[cfg(feature = "std_detect_env_override")]