diff options
Diffstat (limited to 'backend/IRC.ml')
| -rw-r--r-- | backend/IRC.ml | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/backend/IRC.ml b/backend/IRC.ml index 79d66b9..64de4e4 100644 --- a/backend/IRC.ml +++ b/backend/IRC.ml @@ -640,13 +640,15 @@ let combine g u v = else DLinkNode.move v g.spillWorklist g.coalescedNodes; v.alias <- Some u; (* Precolored nodes often have big movelists, and if one of [u] and [v] - is precolored, it is []u. So, append [v.movelist] to [u.movelist] + is precolored, it is [u]. So, append [v.movelist] to [u.movelist] instead of the other way around. *) u.movelist <- List.rev_append v.movelist u.movelist; u.spillcost <- u.spillcost +. v.spillcost; iterAdjacent (combineEdge g u) v; (*r original code using [decrementDegree] is buggy *) - u.extra_adj <- u.extra_adj @ v.extra_adj; - u.extra_pref <- u.extra_pref @ v.extra_pref; + if u.nstate <> Colored then begin + u.extra_adj <- List.rev_append v.extra_adj u.extra_adj; + u.extra_pref <- List.rev_append v.extra_pref u.extra_pref + end; enableMoves g v; (*r added as per Appel's book erratum *) if u.degree >= g.num_available_registers.(u.regclass) && u.nstate = FreezeWorklist |