[Bug tree-optimization/89772] memchr for a character not in constant nul-padded string not folded

[junma at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89772

--- Comment #3 from junma at gcc dot gnu.org ---
Author: junma
Date: Thu Jun 27 09:50:35 2019
New Revision: 272740

URL: https://gcc.gnu.org/viewcvs?rev=272740&root=gcc&view=rev
Log:
        PR tree-optimization/89772
        * gimple-fold.c (gimple_fold_builtin_memchr): consider trailing nuls in
        out-of-bound accesses checking.

        gcc/testsuite
        * gcc.dg/builtin-memchr-4.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/builtin-memchr-4.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-fold.c
    trunk/gcc/testsuite/ChangeLog