https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67607

--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
Created attachment 36362
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36362&action=edit
shortening

The shortening case seems much easier and does not require VRP information.

Calling get_range_info from match.pd is not done now (not sure if it would be a
good idea or not), so the widening case may have to be written separately in
VRP.

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