diff options
Diffstat (limited to 'lisc')
| -rw-r--r-- | lisc/ssa.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/lisc/ssa.c b/lisc/ssa.c index 4bf6c46..cd9e1a7 100644 --- a/lisc/ssa.c +++ b/lisc/ssa.c @@ -44,13 +44,19 @@ fillpreds(Fn *f) static int rporec(Blk *b, int x) { - if (b->id >= 0) + Blk *s1, *s2; + + if (!b || b->id >= 0) return x; b->id = 1; - if (b->s2) - x = rporec(b->s2, x); - if (b->s1) - x = rporec(b->s1, x); + s1 = b->s1; + s2 = b->s2; + if (s1 && s2 && s1->loop > s2->loop) { + s1 = b->s2; + s2 = b->s1; + } + x = rporec(s1, x); + x = rporec(s2, x); b->id = x; assert(x >= 0); return x - 1; |