https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91242

rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rsandifo at gcc dot 
gnu.org

--- Comment #8 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
---
Mine.  The problem is with using the raw elt value to hash
wide ints.  build_poly_int_cst is hashing a "normal"
sign-extended wide_int, whereas ::hash is operating on the
INTEGER_CST representation, which for unsigned integers is
zero-extended instead.

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