[Bug tree-optimization/88074] [7/8 Regression] g++ hangs on math expression

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88074

--- Comment #34 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr 30 20:28:56 2019
New Revision: 270712

URL: https://gcc.gnu.org/viewcvs?rev=270712&root=gcc&view=rev
Log:
        Backported from mainline
        2019-02-20  Jakub Jelinek  <jakub@redhat.com>

        PR middle-end/88074
        PR middle-end/89415
        * toplev.c (do_compile): Double the emin/emax exponents to workaround
        buggy mpc_norm.

        * gcc.dg/pr88074-2.c: New test.

        2019-02-19  Richard Biener  <rguenther@suse.de>

        PR middle-end/88074
        * toplev.c (do_compile): Initialize mpfr's exponent range
        based on available float modes.

        * gcc.dg/pr88074.c: New testcase.

Added:
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/pr88074-2.c
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/pr88074.c
Modified:
    branches/gcc-8-branch/gcc/ChangeLog
    branches/gcc-8-branch/gcc/testsuite/ChangeLog
    branches/gcc-8-branch/gcc/toplev.c