around line 520, it is is still evaluating the "if".
at line 555 you can see the "for" taken for execution.
at line 566 its unrolling. [1]
i hope this will help you reading the log.
maybe i should make it clearer, like using
"INPUT>" and
"OUTPUT<"
instead of ">" and "<"
[1] at the moment "for"s are unrolled, but i think i will change this. it will be execution step-by-step, like for the "while".