[Bug middle-end/80100] simplify-rtx.c sanitizer detects undefined behaviour with optimization

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80100

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Apr 11 17:21:51 2017
New Revision: 246851

URL: https://gcc.gnu.org/viewcvs?rev=246851&root=gcc&view=rev
Log:
        PR middle-end/80100
        * simplify-rtx.c (simplify_binary_operation_1) <case IOR>: Perform
        left shift in unsigned HOST_WIDE_INT type.

        * gcc.dg/pr80100.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/pr80100.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/simplify-rtx.c
    trunk/gcc/testsuite/ChangeLog