cleanup

src/reduce/gray8_simd.rs

@@ -0,0 +1,33 @@
+use std::{
+    arch::arm::{vld1q_u8, vst1q_u8, vuzpq_u8},
+    convert::TryInto,
+};
+
+const GROUP_BY: usize = 32;
+pub const fn out_size(in_size: usize) -> usize {
+    in_size / 2
+}
+
+pub fn run(buf: &mut [u8]) {
+    let n_raw = buf.len();
+    let mut in_cursor = 0;
+    let mut out_cursor = 0;
+
+    let mut res = [0u8; 16];
+
+    while in_cursor + GROUP_BY <= n_raw {
+        let a: &[u8; 16] = buf[in_cursor..in_cursor + 16].try_into().unwrap();
+        let b: &[u8; 16] = buf[in_cursor + 16..in_cursor + 32].try_into().unwrap();
+
+        unsafe {
+            let a = vld1q_u8(a as *const u8);
+            let b = vld1q_u8(b as *const u8);
+            let z = vuzpq_u8(a, b);
+            vst1q_u8(&mut res as *mut u8, z.0);
+        }
+
+        buf[out_cursor..out_cursor + 16].copy_from_slice(&res);
+        out_cursor += 16;
+        in_cursor += GROUP_BY;
+    }
+}