------- Comment #34 from vmakarov at redhat dot com 2009-01-21 03:15 ------- C standard guarantees that automatic variable only with volatile will be restored after longjmp. Gcc puts volatiles on stack and don't use pseudos for them. So they will be never shared on stack.
I think the code (its expected behavior) does not conform with the standard. Unfortunately there are a lot of code which does not conform with the standard. So I think we should provide the same functionality. It can be done by prohibiting stack slot sharing in IRA if there are setjmps in the function. I'll make a patch and send it for a review after some testing most probably tomorrow. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38587
