[Bug lto/85574] [9 Regression] LTO bootstapped binaries differ

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85574

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Fri May  4 07:25:54 2018
New Revision: 259922

URL: https://gcc.gnu.org/viewcvs?rev=259922&root=gcc&view=rev
Log:
2018-05-04  Richard Biener  <rguenther@suse.de>

        PR middle-end/85574
        * fold-const.c (negate_expr_p): Restrict negation of operand
        zero of a division to when we know that can happen without
        overflow.
        (fold_negate_expr_1): Likewise.

        * gcc.dg/torture/pr85574.c: New testcase.
        * gcc.dg/torture/pr57656.c: Use dg-additional-options.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr85574.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/torture/pr57656.c