The order of loop traversal in gcc

[Hanke Zhang]

Hi, I have recently been working on loops in gcc, and I have some
questions about the loop traversal.

I use loops_list(cfun, LI_ONLY_INNERMOST) to traverse the loops in my
pass to obtain the loop.

I found that the order of traversal and the order of actual
instruction execution will be different.

Sometimes it's the exact opposite, and sometimes it's sequential. I
would like to ask how to predict its behavior? And what method should
I use if I want to obtain sequential traversal?

Thanks.
Hanke Zhang.