[Bug middle-end/86554] [7/8/9 Regression] Incorrect code generation with signed/unsigned comparison

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86554

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Jan  8 13:05:47 2019
New Revision: 267725

URL: https://gcc.gnu.org/viewcvs?rev=267725&root=gcc&view=rev
Log:
2019-01-08  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/86554
        * tree-ssa-sccvn.c (eliminate_dom_walker, rpo_elim,
        rpo_avail): Move earlier.
        (visit_nary_op): When value-numbering to expressions
        with different overflow behavior make sure there's an
        available expression on the path.

        * gcc.dg/torture/pr86554-1.c: New testcase.
        * gcc.dg/torture/pr86554-2.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr86554-1.c
    trunk/gcc/testsuite/gcc.dg/torture/pr86554-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-sccvn.c