[Bug middle-end/46932] Inefficient code sequence to access local variable

["wilco at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46932

--- Comment #9 from Wilco <wilco at gcc dot gnu.org> ---
Author: wilco
Date: Mon Aug 14 11:18:50 2017
New Revision: 251087

URL: https://gcc.gnu.org/viewcvs?rev=251087&root=gcc&view=rev
Log:
Add check_effective_target_autoincdec.

Add check_effective_target_autoincdec that returns true if a target
runs the auto_inc_dec optimization pass.

    gcc/
        * doc/sourcebuild.texi (autoincdec): Add autoincdec description.

    gcc/testsuite/
        PR middle-end/46932
        * gcc.dg/pr46932.c: Use dg-require-effective-target autoincdec.
        * lib/target-supports.exp: Add check_effective_target_autoincdec.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/doc/sourcebuild.texi
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/pr46932.c
    trunk/gcc/testsuite/lib/target-supports.exp