Add json-framed encoding, docs, refactor

crates/bitshuffle/src/bitshuffle.rs

@@ -68,3 +68,74 @@ pub fn lz4_decompress(inp: &[u8], out: &mut [u8]) -> Result<usize, isize> {
         Ok(ec as _)
     }
 }
+
+#[cfg(test)]
+mod _simd {
+    use std::arch::x86_64::_mm_loadu_si128;
+    use std::arch::x86_64::_mm_shuffle_epi32;
+    use std::ptr::null;
+
+    #[test]
+    fn simd_test() {
+        if is_x86_feature_detected!("sse") {
+            eprintln!("have sse 1");
+        }
+        if is_x86_feature_detected!("sse2") {
+            eprintln!("have sse 2");
+            unsafe { simd_sse_2() };
+        }
+        if is_x86_feature_detected!("sse3") {
+            eprintln!("have sse 3");
+            unsafe { simd_sse_3() };
+        }
+        if is_x86_feature_detected!("sse4.1") {
+            eprintln!("have sse 4.1");
+            unsafe { simd_sse_4_1() };
+        }
+        if is_x86_feature_detected!("sse4.2") {
+            eprintln!("have sse 4.2");
+            unsafe { simd_sse_4_2() };
+        }
+        if is_x86_feature_detected!("sse4a") {
+            eprintln!("have sse 4 a");
+        }
+        if is_x86_feature_detected!("avx") {
+            eprintln!("have avx 1");
+        }
+        if is_x86_feature_detected!("avx2") {
+            eprintln!("have avx 2");
+        }
+    }
+
+    #[target_feature(enable = "sse2")]
+    unsafe fn simd_sse_2() {
+        // _mm_loadu_si128(null());
+        eprintln!("sse 2 done");
+    }
+
+    #[target_feature(enable = "sse3")]
+    unsafe fn simd_sse_3() {
+        // core::arch::asm!();
+        // core::arch::global_asm!();
+        let a = core::arch::x86_64::_mm256_setzero_si256();
+        let b = core::arch::x86_64::_mm256_set_epi32(7, 3, 9, 11, 17, 13, 19, 21);
+        let x = core::arch::x86_64::_mm256_xor_si256(a, b);
+        core::arch::x86_64::_mm256_loadu_si256(&x as *const _);
+        // core::arch::x86_64::vpl!();
+        // core::arch::x86_64::vps!();
+        // let c = core::arch::x86_64::_mm256_shuffle_i32x4(a, b);
+        eprintln!("sse 3 done");
+    }
+
+    #[target_feature(enable = "sse4.1")]
+    unsafe fn simd_sse_4_1() {
+        // _mm_loadu_si128(null());
+        eprintln!("sse 4.1 done");
+    }
+
+    #[target_feature(enable = "sse4.2")]
+    unsafe fn simd_sse_4_2() {
+        // _mm_loadu_si128(null());
+        eprintln!("sse 4.2 done");
+    }
+}