Updating for nightly stable armsimd

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "crc32c"
-version = "0.6.5"
+version = "0.6.6"
 authors = ["Zack Owens"]
 license = "Apache-2.0/MIT"
 keywords = ["crc", "simd"]

README.md

@@ -11,7 +11,7 @@ Hardware acceleration on the following architectures:
     * All stable versions of Rust
     * If SSE 4.2 is enabled at compile time, it will only build the SSE implementation. Otherwise, the `cpuid` is used to find the best implementation at runtime.
 1. **aarch64** with [crc feature](https://developer.arm.com/documentation/dui0801/g/A32-and-T32-Instructions/CRC32C)
-    * Only available on nightly (enabled by default without feature)
+    * Only available on rust version >= 1.80.0 or nightly
 
 All other processors utilize a software fallback.
 

build.rs

@@ -1,7 +1,7 @@
 #![allow(clippy::uninit_assumed_init)]
 extern crate rustc_version;
 
-use rustc_version::{version_meta, Channel};
+use rustc_version::{Version, version};
 use std::io::Write;
 use std::path::Path;
 use std::{io, ops};
@@ -183,9 +183,19 @@ fn write_tables() -> io::Result<()> {
 }
 
 fn main() {
+    println!("cargo::rerun-if-changed=build.rs");
     write_tables().expect("Failed to write CRC tables");
+    let min_version = Version::new(1, 80, 0);
 
-    if version_meta().unwrap().channel == Channel::Nightly {
-        println!("cargo:rustc-cfg=nightly");
+    let current_version = {
+        // rmeove prerelease tag for now, if it exists
+        let vers = version().unwrap();
+        Version::new(vers.major, vers.minor, vers.patch)
+    };
+
+    // only stable in nightly versions for 1.80 and above
+    println!("cargo::rustc-check-cfg=cfg(armsimd)");
+    if current_version >= min_version {
+        println!("cargo::rustc-cfg=armsimd");
     }
 }

src/lib.rs

@@ -22,9 +22,9 @@
 
 mod combine;
 mod hasher;
-#[cfg(all(target_arch = "aarch64", nightly))]
+#[cfg(all(target_arch = "aarch64", armsimd))]
 mod hw_aarch64;
-#[cfg(any(target_arch = "x86_64", all(target_arch = "aarch64", nightly)))]
+#[cfg(any(target_arch = "x86_64", target_arch = "aarch64"))]
 mod hw_tables;
 #[cfg(target_arch = "x86_64")]
 mod hw_x86_64;
@@ -54,7 +54,7 @@ pub fn crc32c_append(crc: u32, data: &[u8]) -> u32 {
         }
     }
 
-    #[cfg(all(target_arch = "aarch64", nightly))]
+    #[cfg(all(target_arch = "aarch64", armsimd))]
     {
         if std::arch::is_aarch64_feature_detected!("crc") {
             return unsafe { hw_aarch64::crc32c(crc, data) };