give copy a slightly higher weight

be4e027c · qinsoon · cfac6aa6 · be4e027c
Commit be4e027c authored Oct 30, 2017 by qinsoon
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liveness.rs src/compiler/backend/reg_alloc/graph_coloring/liveness.rs +1 -1

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--- a/src/compiler/backend/reg_alloc/graph_coloring/liveness.rs
+++ b/src/compiler/backend/reg_alloc/graph_coloring/liveness.rs
@@ -165,7 +165,7 @@ impl InterferenceGraph {
    fn spillcost_heuristic(ty: NodeType, loop_depth: usize) -> f32 {
        const DEF_WEIGHT: f32 = 1f32;
        const USE_WEIGHT: f32 = 1f32;
-        const COPY_WEIGHT: f32 = 1f32;
+        const COPY_WEIGHT: f32 = 2f32;

        let loop_depth = loop_depth as i32;