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fix bug in jumps simplification

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In presence of jump loops, the algorithm would
create cycles in the disjoint-set data structure.
This caused infinite recursion and stack overflows.
This commit is contained in:
Quentin Carbonneaux 2017-08-17 04:47:10 -04:00
parent 2b64b75c84
commit ae80e4f7ca
1 changed files with 5 additions and 2 deletions
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7
cfg.c
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@ -304,8 +304,11 @@ simpljmp(Fn *fn)
for (b=fn->start; b; b=b->link) {
assert(!b->phi);
if (b->nins == 0)
if (b->jmp.type == Jjmp)
uf[b->id] = b->s1;
if (b->jmp.type == Jjmp) {
uffind(&b->s1, uf);
if (b->s1 != b)
uf[b->id] = b->s1;
}
}
for (b=fn->start; b; b=b->link) {
if (b->s1)