Created attachment 28512
gdb backtrace
Root cause:
PRE bases on the result of value numbering (run_scc_vn). At the end, it
free_scc_vn. But before free_scc_vn, it might call cleanup_tree_cfg ();
if (do_eh_cleanup || do_ab_cleanup)
cleanup_tree_cfg ();
cleanup_tree_cfg might call make_ssa_name which might reuse some "name"
from the FREE_SSANAMES list. If the VN_INFO of the "name" is NULL,
free_scc_vn will "Segmentation fault".
Richard's patch makes "do_eh_cleanup" to false. So cleanup_tree_cfg is
not called in PRE. Then no new ssa name will be created.
bt.log shows the gdb backtrace to create a new ssa name.
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https://bugs.launchpad.net/bugs/1065559
Title:
[regression] cone ftbfs on armel/armhf using GCC 4.7
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