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As mentioned in the PRthe following testcase fails, because the last stmt of a bb with -g is a debug stmt and get_status_for_store_merging uses gimple_seq_last_stmt (bb_seq (bb)) when testing if it is valid for store merging. The debug stmt isn't valid, while a stmt at that position with -g0 is valid and so the divergence. As we walk the whole bb already, this patch just remembers the last non-debug stmt, so that we don't need to skip backwards debug stmts at the end of the bb to find last real stmt. 2022-01-28 Jakub Jelinek <jakub@redhat.com> PR tree-optimization/104263 * gimple-ssa-store-merging.cc (get_status_for_store_merging): For cfun->can_throw_non_call_exceptions && cfun->eh test whether last non-debug stmt in the bb is store_valid_for_store_merging_p rather than last stmt. * gcc.dg/pr104263.c: New test.
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