[Bug middle-end/71762] [5/6/7 Regression] ~X & Y to X < Y doesn't work for uninitialized values

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71762

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Nov 23 11:33:03 2016
New Revision: 242747

URL: https://gcc.gnu.org/viewcvs?rev=242747&root=gcc&view=rev
Log:
2016-11-23  Richard Biener  <rguenther@suse.de>

        PR middle-end/71762
        * match.pd ((~X & Y) -> X < Y, (X & ~Y) -> Y < X,
        (~X | Y) -> X <= Y, (X | ~Y) -> Y <= X): Remove.

        * gcc.dg/torture/pr71762-1.c: New testcase.
        * gcc.dg/torture/pr71762-2.c: Likewise.
        * gcc.dg/torture/pr71762-3.c: Likewise.
        * gcc.dg/tree-ssa/forwprop-28.c: XFAIL.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr71762-1.c
    trunk/gcc/testsuite/gcc.dg/torture/pr71762-2.c
    trunk/gcc/testsuite/gcc.dg/torture/pr71762-3.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/match.pd
    trunk/gcc/testsuite/ChangeLog