https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97969
--- Comment #5 from Paul Sokolovsky <pmiscml at gmail dot com> ---
ktkac...@gcc.gnu.org:
Thanks for looking into this issue! Looking forward for the root cause to be
found. Given the minimized testcase which CReduce came to, my finger-in-the-sky
bet would be that it's a very fine case of data structure corruption, which
doesn't lead to segfault, but rather to infiniloop.
I'm saying that, because I tried to play with the minimized example myself, but
saw that most changes get rid of the issue. The only "simplifying" change I
could make which still leads to infiniloop is replace usage of the "h" enum
with "char" ("int" doesn't work). That makes declaration of the "h" enum
unused, and yet removal of it fixes the loop. That's why I say it looks like
very fine memory corruption, it's hard to imagine how unused enum declaration
can affect regalloc.
But then, I don't have experience with this stuff, and the setup is too
complicated for me to try. So again, thanks for looking into this.
