[Bug sanitizer/81065] UBSAN: false positive as a result of distribution involving different types

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81065

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Jun 13 07:07:08 2017
New Revision: 249144

URL: https://gcc.gnu.org/viewcvs?rev=249144&root=gcc&view=rev
Log:
2017-06-13  Richard Biener  <rguent...@suse.de>

        PR middle-end/81065
        * fold-const.c (extract_muldiv_1): Remove bogus distribution
        case of C * (x * C2 + C3).
        (fold_addr_of_array_ref_difference): Properly fold index difference.

        * c-c++-common/ubsan/pr81065.c: New testcase.

Added:
    trunk/gcc/testsuite/c-c++-common/ubsan/pr81065.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog