[Bug middle-end/78153] strlen return value can be assumed to be less than PTRDIFF_MAX

[prathamesh3492 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78153

--- Comment #1 from prathamesh3492 at gcc dot gnu.org ---
Author: prathamesh3492
Date: Wed Nov 23 18:04:14 2016
New Revision: 242786

URL: https://gcc.gnu.org/viewcvs?rev=242786&root=gcc&view=rev
Log:
2016-11-23  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

        PR middle-end/78153
        * gimple-fold.c (fold_stmt_1): Handle case for GIMPLE_RETURN.
        * tree-vrp.c (extract_range_basic): Handle case for
        CFN_BUILT_IN_STRLEN.

testsuite/
        * gcc.dg/tree-ssa/pr78153-1.c: New test.
        * gcc.dg/tree-ssa/pr78153-2.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr78153-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr78153-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-fold.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c