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The following replaces the not quite correct use of mark_virtual_operand_for_renaming by an appropriate way of dealing with a possibly partially up-to-date virtual SSA form. Namely when we just move stmts and not remove a VDEF we should arrange for missing virtual PHIs to be created and just queue its arguments for possible renaming. For the testcase at hand there's no renaming necessary in the end when done this way. PR tree-optimization/123596 * tree-eh.cc (sink_clobbers): Create a virtual PHI when one is required but not present, queuing arguments for renaming. * g++.dg/torture/pr123596.C: New testcase.
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