fixes, rewrote liveness gen a bit

src/asm/amd64.rs

@@ -314,6 +314,11 @@ impl Register {
         [r12, r13, r14, r15, rbx]
     };
 
+    pub const SYSV_SCRATCH_GPRS: [Register; 8] = {
+        use Register::*;
+        [rax, rsi, rdx, rcx, r8, r9, r10, r11]
+    };
+
     pub const GPR: [Register; 14] = {
         use Register::*;
         [

src/bin/main.rs

@@ -1,6 +1,6 @@
 use std::{io::Read, path::PathBuf};
 
-use clap::{Arg, Command};
+use clap::Command;
 use compiler::{
     lexer::Tokenizer,
     parser::Tree,

src/parser.rs

@@ -82,6 +82,7 @@ impl Nodes {
         self.push_tag(Tag::Undefined)
     }
 
+    #[allow(dead_code)]
     fn swap_nodes(&mut self, lhs: Node, rhs: Node) {
         self.inner.swap(lhs.get() as usize, rhs.get() as usize);
     }

tests/legal/inverse_sqrt.sea

@@ -1,7 +1,7 @@
 fn inverse_sqrt(n: f32) -> f32 {
    let x = n;
    var i = *(&x as *i32);
-   i = 0x5f3759dfi32 - (i >> 1u8);
+   i = 0x5f3759dfi32 - (i >> 1);
    let y = *(&i as *f32);
    y * (1.5f32 - (x * 0.5f32 * y * y))
 }