[Bug rtl-optimization/82044] runtime signed integer overflow in check_mem_read_rtx() and all_positions_needed_p() in dse.c

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82044

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Nov 22 09:04:47 2017
New Revision: 255046

URL: https://gcc.gnu.org/viewcvs?rev=255046&root=gcc&view=rev
Log:
2017-11-22  Richard Biener  <rguenther@suse.de>

        Revert
        2017-11-21  Martin Liska  <mliska@suse.cz>

        Backport from mainline
        2017-11-21  Martin Liska  <mliska@suse.cz>

        PR rtl-optimization/82044
        PR tree-optimization/82042
        * dse.c (check_mem_read_rtx): Check for overflow.

Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/dse.c