[Bug target/81906] [7 Regression] Calls to rint() wrongly optimized away starting in g++ 6

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81906
--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Dec 15 22:11:33 2017
New Revision: 255725

URL: https://gcc.gnu.org/viewcvs?rev=255725&root=gcc&view=rev
Log:
        Backported from mainline
        2017-12-08  Joseph Myers  <jos...@codesourcery.com>
                    Alexander Monakov  <amona...@ispras.ru>
                    Jakub Jelinek  <ja...@redhat.com>

        PR target/81906
        * config/i386/i386.c (ix86_expand_rint): Handle flag_rounding_math.

        * gcc.target/i386/pr81906.c: New test.

Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.target/i386/pr81906.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/config/i386/i386.c
    branches/gcc-7-branch/gcc/testsuite/ChangeLog