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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/91858] [9/10 Regression] Compile time hog w/ complex
 float trigonometric functions
Date: Wed, 01 Apr 2020 13:17:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91858

--- Comment #7 from Vincent Lef=C3=A8vre <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 =3D 14 corresponds to 10000 as
expected (11258999068426240000 =3D 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.=