[Bug fortran/109511] incorrectly rejects set_exponent with constant negative exponent

[anlauf at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109511

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
           Keywords|                            |wrong-code
                 CC|                            |anlauf at gcc dot gnu.org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-04-14

--- Comment #1 from anlauf at gcc dot gnu.org ---
Confirmed.

The simplification seems to use the old mpfr_mul_2exp which takes an
unsigned exponent.  There is the newer mpfr_mul_2si which accepts a signed
exponent.