FIRST INSTRUCTION WORKING

src/instructions/gen_tools.rs

@@ -0,0 +1,22 @@
+use std::hint::unreachable_unchecked;
+
+use crate::instructions::{OpcodeHandler, Splitter};
+
+pub fn insert_funct3_splitter(splitter: &mut Option<Splitter>) -> &mut [OpcodeHandler; 8] {
+    match splitter {
+        Some(Splitter::Funct3Splitter(s)) => s.as_mut(),
+        Some(_) => panic!("Unexpected splitter variant"),
+        None => {
+            *splitter = Some(Splitter::Funct3Splitter(Box::new(std::array::from_fn(
+                |_i| OpcodeHandler {
+                    handler: None,
+                    splitter: None,
+                },
+            ))));
+            match splitter {
+                Some(Splitter::Funct3Splitter(s)) => s.as_mut(),
+                _ => unsafe { unreachable_unchecked() },
+            }
+        }
+    }
+}