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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 15:53:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91858

--- Comment #12 from Vincent Lef=C3=A8vre <vincent-gcc at vinc17 dot net> -=
--
(In reply to Vincent Lef=C3=A8vre from comment #11)
> (In reply to Vincent Lef=C3=A8vre from comment #10)
> > Paul Zimmermann says that this bug is fixed in the MPC development vers=
ion.
>=20
> I could check that the bug is actually fixed, but the does not solve the =
GCC
> issue, as the time complexity is too large. With 10000000 instead of 1000=
0,
> you'll still notice that it takes too much time.

But as Paul says, keeping the exponent range reduced as above allows an
immediate answer. So the solution will be to upgrade to the next MPC version
(not released yet) and do not increase the exponent range (this allows early
underflow/overflow checking, thus may avoid costly computations in some
domains).=