diff --git a/src/mir.rs b/src/mir.rs
index 8e06108..42b080d 100644
--- a/src/mir.rs
+++ b/src/mir.rs
@@ -1306,11 +1306,17 @@ pub mod liveness {
             });
 
             let mut edges = HashSet::<(u32, u32)>::new();
+            // eprint!("intervals: [");
             for (from, to) in intervals {
-                for &(other, _) in references.range(from.exclusive_start()..to.inclusive_end()) {
+                // eprint!("({from})..({to}), ");
+                if !mir.is_register(from.0) {
+                    continue;
+                }
+                for &(other, _) in references.range(from.exclusive_start()..to.exclusive_end()) {
                     edges.insert((from.0, other.0));
                 }
             }
+            // eprintln!("]");
 
             let inference_graph = petgraph::graph::UnGraph::<(), ()>::from_edges(edges.into_iter());
 
@@ -1614,6 +1620,7 @@ pub mod liveness {
 }
 
 impl Mir {
+    /// returns the in/out operand, if it exists: example would be (%node = add rax, rcx) -> rax
     fn dst_node(&self, node: NodeRef) -> Option<NodeRef> {
         // for each node, look at the dst node and see if it has preferred
         // color, then also prefer that color.
@@ -2463,7 +2470,7 @@ impl Mir {
                     let rhs = self.node_as_operand(&liveness, &mapping, &mut func, strings, rhs);
 
                     writeln!(func.current_branch(), "mulss {lhs}, {rhs}")?;
-                    if lhs.occupy_same_register(dst) {
+                    if !lhs.occupy_same_register(dst) {
                         writeln!(func.current_branch(), "movss {dst}, {lhs}")?;
                     }
                 }
@@ -2474,7 +2481,7 @@ impl Mir {
                     let rhs = self.node_as_operand(&liveness, &mapping, &mut func, strings, rhs);
 
                     writeln!(func.current_branch(), "divss {lhs}, {rhs}")?;
-                    if lhs.occupy_same_register(dst) {
+                    if !lhs.occupy_same_register(dst) {
                         writeln!(func.current_branch(), "movss {dst}, {lhs}")?;
                     }
                 }