https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114557
Bug ID: 114557
Summary: ehcleanup cleanup_empty_eh_merge_phis eats a lot of
memory
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
For the testcase in PR114480 we end up redirecting a lot of edges into
very high in-degree blocks.
(gdb) p new_bb->preds.m_vecpfx
$3 = {m_alloc = 4095, m_using_auto_storage = 0, m_num = 3911}
the way the edge redirection works it will resize the target PHI nodes
a lot of time, leaving the old PHIs as garbage until the next GC collection.
For the testcase this piles up to 16GB of garbage.
