Add force-generic feature flag

.github/workflows/ci.yml

@@ -41,10 +41,10 @@ jobs:
 
       - run: cargo build
       - run: cargo test
-      - run: cargo test --release
       - run: cargo build --no-default-features
       - run: cargo test --tests --no-default-features
-      - run: cargo test --tests --no-default-features --release --all-features
+      - run: cargo test --tests --no-default-features --features force-generic
+      - run: cargo test --tests --no-default-features --features nightly,portable-simd
         if: matrix.rust == 'nightly'
       - run: cargo bench --no-run
         if: matrix.rust == 'nightly'
@@ -57,7 +57,7 @@ jobs:
       fail-fast: false
       matrix:
         target: [x86_64-unknown-linux-gnu, aarch64-unknown-linux-gnu]
-        flags: [--no-default-features, "", --all-features]
+        flags: [--no-default-features, "", --all-features, --features force-generic]
         exclude:
           # miri doesn't implement neon intrinsics.
           - target: aarch64-unknown-linux-gnu

Cargo.toml

@@ -34,6 +34,9 @@ default = ["std"]
 std = ["hex?/std", "serde?/std", "alloc"]
 alloc = ["hex?/alloc", "serde?/alloc"]
 
+# Forces generic implementation, overriding any specialized implementation (e.g. x86 or aarch64)
+force-generic = []
+
 # Serde support. Use with `#[serde(with = "const_hex")]`
 serde = ["hex?/serde", "dep:serde"]
 

src/lib.rs

@@ -40,7 +40,9 @@ use alloc::{string::String, vec::Vec};
 
 // The main encoding and decoding functions.
 cfg_if! {
-    if #[cfg(feature = "portable-simd")] {
+    if #[cfg(feature = "force-generic")] {
+        use generic as imp;
+    } else if #[cfg(feature = "portable-simd")] {
         mod portable_simd;
         use portable_simd as imp;
     } else if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {