add no_std support

src/avx2.rs

@@ -432,7 +432,7 @@ mod test {
 
     #[test]
     fn test_transpose() {
-        if !is_x86_feature_detected!("avx2") {
+        if !crate::platform::avx2_detected() {
             return;
         }
 
@@ -464,7 +464,7 @@ mod test {
 
     #[test]
     fn test_parents() {
-        if !is_x86_feature_detected!("avx2") {
+        if !crate::platform::avx2_detected() {
             return;
         }
 
@@ -519,7 +519,7 @@ mod test {
 
     #[test]
     fn test_chunks() {
-        if !is_x86_feature_detected!("avx2") {
+        if !crate::platform::avx2_detected() {
             return;
         }
 
@@ -596,7 +596,7 @@ mod test {
 
     #[test]
     fn test_hash_many() {
-        if !is_x86_feature_detected!("avx2") {
+        if !crate::platform::avx2_detected() {
             return;
         }
 

src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+
 use arrayref::{array_refs, mut_array_refs};
 use arrayvec::ArrayString;
 use core::fmt;

src/platform.rs

@@ -21,10 +21,10 @@ impl Platform {
     pub fn detect() -> Self {
         #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
         {
-            if is_x86_feature_detected!("avx2") {
+            if avx2_detected() {
                 return Platform::AVX2;
             }
-            if is_x86_feature_detected!("sse4.1") {
+            if sse41_detected() {
                 return Platform::SSE41;
             }
         }
@@ -114,3 +114,39 @@ impl Platform {
         }
     }
 }
+
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+#[inline(always)]
+pub fn avx2_detected() -> bool {
+    // Static check, e.g. for building with target-cpu=native.
+    #[cfg(target_feature = "avx2")]
+    {
+        return true;
+    }
+    // Dyanmic check, if std is enabled.
+    #[cfg(feature = "std")]
+    {
+        if is_x86_feature_detected!("avx2") {
+            return true;
+        }
+    }
+    false
+}
+
+#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+#[inline(always)]
+pub fn sse41_detected() -> bool {
+    // Static check, e.g. for building with target-cpu=native.
+    #[cfg(target_feature = "sse4.1")]
+    {
+        return true;
+    }
+    // Dyanmic check, if std is enabled.
+    #[cfg(feature = "std")]
+    {
+        if is_x86_feature_detected!("sse4.1") {
+            return true;
+        }
+    }
+    false
+}

src/sse41.rs

@@ -670,7 +670,7 @@ mod test {
 
     #[test]
     fn test_transpose() {
-        if !is_x86_feature_detected!("sse4.1") {
+        if !crate::platform::sse41_detected() {
             return;
         }
 
@@ -702,7 +702,7 @@ mod test {
 
     #[test]
     fn test_compress() {
-        if !is_x86_feature_detected!("sse4.1") {
+        if !crate::platform::sse41_detected() {
             return;
         }
 
@@ -737,7 +737,7 @@ mod test {
 
     #[test]
     fn test_parents() {
-        if !is_x86_feature_detected!("sse4.1") {
+        if !crate::platform::sse41_detected() {
             return;
         }
 
@@ -784,7 +784,7 @@ mod test {
 
     #[test]
     fn test_chunks() {
-        if !is_x86_feature_detected!("sse4.1") {
+        if !crate::platform::sse41_detected() {
             return;
         }
 
@@ -853,7 +853,7 @@ mod test {
 
     #[test]
     fn test_hash1_1() {
-        if !is_x86_feature_detected!("sse4.1") {
+        if !crate::platform::sse41_detected() {
             return;
         }
 
@@ -893,7 +893,7 @@ mod test {
 
     #[test]
     fn test_hash1_3() {
-        if !is_x86_feature_detected!("sse4.1") {
+        if !crate::platform::sse41_detected() {
             return;
         }
 
@@ -934,7 +934,7 @@ mod test {
 
     #[test]
     fn test_hash_many() {
-        if !is_x86_feature_detected!("sse4.1") {
+        if !crate::platform::sse41_detected() {
             return;
         }