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From: "rguenther at suse dot de" <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 13:38:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91858

--- Comment #9 from rguenther at suse dot de <rguenther at suse dot de> ---
On Wed, 1 Apr 2020, vincent-gcc at vinc17 dot net wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91858
>=20
> --- 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.
>=20
> Yes, and 11258999068426240000 with _mpfr_exp =3D 14 corresponds to 10000 =
as
> expected (11258999068426240000 =3D 10000*2^50).
>=20
> And even when reusing the input
>=20
>   mpc_init2 (x, 24);
>   mpc_set_ui_ui (x, 10000, 10000, MPC_RNDNN);
>   mpc_tan (x, x, 0);
>=20
> the program terminates immediately.
>=20
> I'm going to look at this more closely with gdb. But I confirm I can see
> mpc_tan in the backtrace.

It's likely by us doing

mpfr_set_emin (-32990);
mpfr_set_emax (32766);

during startup to work around a similar bug in MPC (IIRC it also
was tan ...).=