[Bug c++/78655] gcc doesn't exploit the fact that the result of pointer addition can not be nullptr

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78655

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Aug 20 14:01:05 2018
New Revision: 263662

URL: https://gcc.gnu.org/viewcvs?rev=263662&root=gcc&view=rev
Log:
2018-08-20  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/78655
        * tree-vrp.c (extract_range_from_binary_expr_1): Make
        pointer + offset nonnull if either operand is nonnull work.

        * gcc.dg/tree-ssa/evrp11.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/evrp11.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c