[Bug tree-optimization/67328] range test rather than single bit test for code testing enum values

[chefmax at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67328

--- Comment #7 from chefmax at gcc dot gnu.org ---
Author: chefmax
Date: Tue Jun 13 11:13:52 2017
New Revision: 249149

URL: https://gcc.gnu.org/viewcvs?rev=249149&root=gcc&view=rev
Log:
2017-06-13  Yury Gribov  <tetra2...@gmail.com>

gcc/
        PR tree-optimization/67328
        * fold-const.c (maskable_range_p): New function.
        (build_range_check): Generate bittests if possible.

gcc/testsuite/
        PR tree-optimization/67328
        * c-c++-common/fold-masked-cmp-1.c: New test.
        * c-c++-common/fold-masked-cmp-2.c: Likewise.
        * gcc.dg/pr46309.c: Fix pattern.
        * gcc.dg/pr46309-2.c: Likewise.

Added:
    trunk/gcc/testsuite/c-c++-common/fold-masked-cmp-1.c
    trunk/gcc/testsuite/c-c++-common/fold-masked-cmp-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/pr46309-2.c
    trunk/gcc/testsuite/gcc.dg/pr46309.c