[Bug middle-end/91858] [9/10 Regression] Compile time hog w/ complex float trigonometric functions

[vincent-gcc at vinc17 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91858

--- Comment #7 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to Richard Biener from comment #6)
> I guess there's only one limb, the rest looks garbage.

Yes, and 11258999068426240000 with _mpfr_exp = 14 corresponds to 10000 as
expected (11258999068426240000 = 10000*2^50).

And even when reusing the input

  mpc_init2 (x, 24);
  mpc_set_ui_ui (x, 10000, 10000, MPC_RNDNN);
  mpc_tan (x, x, 0);

the program terminates immediately.

I'm going to look at this more closely with gdb. But I confirm I can see
mpc_tan in the backtrace.