[Bug rtl-optimization/87979] ICE in compute_split_row at modulo-sched.c:2393

[zhroma at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87979

--- Comment #3 from Roman Zhuykov <zhroma at gcc dot gnu.org> ---
Author: zhroma
Date: Tue Apr 23 13:14:57 2019
New Revision: 270512

URL: https://gcc.gnu.org/viewcvs?rev=270512&root=gcc&view=rev
Log:
modulo-sched: prevent division by zero (PR87979)

        PR rtl-optimization/87979
        * modulo-sched.c (sms_schedule): Start ii value "mii" should
        not equal zero.

testsuite:

        PR rtl-optimization/87979
        * gcc.dg/pr87979.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr87979.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/modulo-sched.c
    trunk/gcc/testsuite/ChangeLog