[Bug middle-end/84019] [7/8 regression] ICE in fold-const of std::complex division

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84019

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The code in question is:
          const struct real_format *const fmt =
            REAL_MODE_FORMAT (TYPE_MODE (TREE_TYPE (type)));
          const int prec = fmt->p;
          const mp_rnd_t rnd = fmt->round_towards_zero ? GMP_RNDZ : GMP_RNDN;
          const mpc_rnd_t crnd = fmt->round_towards_zero ? MPC_RNDZZ :
MPC_RNDNN;
          int inexact;
          mpc_t m0, m1;

          mpc_init2 (m0, prec);
          mpc_init2 (m1, prec);
and unless Debian builds the compiler with --disable-checking, REAL_MODE_FORMAT
should ICE if it is used with mode other than with MODE_FLOAT class or
DECIMAL_FLOAT_MODE_P.  All the fmt modes have p in between 11 and 200 or so, so
I don't see how this is possible.