[Bug middle-end/52355] [4.7 regression] address difference between array elements is not considered to be a compile time constant anymore

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52355

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-02-24 
11:14:24 UTC ---
Author: rguenth
Date: Fri Feb 24 11:14:17 2012
New Revision: 184548

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=184548
Log:
2012-02-24  Richard Guenther  <rguent...@suse.de>

    PR middle-end/52355
    * fold-const.c (fold_addr_of_array_ref_difference): New function.
    (fold_binary_loc): Use it to extend the existing &a[i] - &a[j]
    folding.

    * gcc.dg/pr52355.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/pr52355.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog