diff options
| -rw-r--r-- | spill.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/spill.c b/spill.c index 2f7ebb2..04afaca 100644 --- a/spill.c +++ b/spill.c @@ -280,6 +280,19 @@ dopm(Blk *b, Ins *i, BSet *v) return i; } +static void +merge(BSet *u, Blk *bu, BSet *v, Blk *bv) +{ + int t; + + if (bu->loop <= bv->loop) + bsunion(u, v); + else + for (t=0; bsiter(v, &t); t++) + if (tmp[t].slot == -1) + bsset(u, t); +} + /* spill code insertion * requires spill costs, rpo, liveness * @@ -364,12 +377,10 @@ spill(Fn *fn) * in the middle of loops */ bszero(v); liveon(w, b, s1); - if (s1->loop >= b->loop) - bsunion(v, w); + merge(v, b, w, s1); if (s2) { liveon(u, b, s2); - if (s2->loop >= b->loop) - bsunion(v, u); + merge(v, b, u, s2); bsinter(w, u); } limit2(v, 0, 0, w); |