Use stable AVX-512 intrinsics on Rust 1.89 or later

ijl · ijl · commit 42094e38968e · 2025-07-10T14:56:46.000Z
diff --git a/Cargo.toml b/Cargo.toml
@@ -30,9 +30,6 @@ crate-type = ["cdylib"]
 [features]
 default = []
 
-# Include runtime-detected functions that use AVX512VL.
-avx512 = []
-
 # Avoid bundling libgcc on musl.
 unwind = ["unwinding"]
 
@@ -41,6 +38,7 @@ unwind = ["unwinding"]
 yyjson = []
 
 # Features detected by build.rs. Do not specify.
+avx512 = []
 generic_simd = []
 inline_int = []
 intrinsics = []
diff --git a/build.rs b/build.rs
@@ -29,6 +29,11 @@ fn main() {
     #[allow(unused_variables)]
     let is_64_bit_python = matches!(python_config.pointer_width, Some(64));
 
+    #[cfg(target_arch = "x86_64")]
+    if version_check::is_min_version("1.89.0").unwrap_or(false) && is_64_bit_python {
+        println!("cargo:rustc-cfg=feature=\"avx512\"");
+    }
+
     if version_check::supports_feature("core_intrinsics").unwrap_or(false) {
         println!("cargo:rustc-cfg=feature=\"intrinsics\"");
     }
