[Bug tree-optimization/45397] [5/6 Regression] Issues with integer narrowing conversions

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45397

--- Comment #31 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Feb 27 08:51:28 2017
New Revision: 245752

URL: https://gcc.gnu.org/viewcvs?rev=245752&root=gcc&view=rev
Log:
2017-02-27  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/45397
        * tree-ssa-pre.c (eliminate_insert): Handle BIT_AND_EXPR.
        * tree-ssa-sccvn.c (valueized_wider_op): New helper.
        (visit_nary_op): Add pattern matching for CSEing sign-changed
        or truncated operations with wider ones.

        * gcc.dg/tree-ssa/pr45397.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr45397.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-pre.c
    trunk/gcc/tree-ssa-sccvn.c