Import the AVX2 engine into the module tree

Author: dequbed

Cargo.toml

@@ -28,6 +28,8 @@ rstest_reuse = "0.1.3"
 default = ["std"]
 alloc = []
 std = []
+unsafe = []
+avx2 = ["unsafe"]
 
 [profile.bench]
 # Useful for better disassembly when using `perf record` and `perf annotate`

src/engine/mod.rs

@@ -4,6 +4,11 @@ use crate::{alphabet, DecodeError};
 
 pub mod fast_portable;
 
+#[cfg(all(any(target_arch = "x86", target_arch = "x86_64"),
+          target_feature = "avx2",
+          feature = "avx2"))]
+pub mod avx2;
+
 #[cfg(test)]
 mod naive;
 

src/lib.rs

@@ -85,7 +85,7 @@
     variant_size_differences,
     warnings
 )]
-#![forbid(unsafe_code)]
+#![cfg_attr(not(feature = "unsafe"), forbid(unsafe_code))]
 #![cfg_attr(not(any(feature = "std", test)), no_std)]
 
 #[cfg(all(feature = "alloc", not(any(feature = "std", test))))]