[Bug middle-end/52835] [4.7/4.8 Regression] -O3 wrongly optimizes loop __builtin_memcpy away

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52835

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-04-03 
08:49:18 UTC ---
Author: jakub
Date: Tue Apr  3 08:49:14 2012
New Revision: 186101

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186101
Log:
    PR tree-optimization/52835
    * tree-data-ref.c (build_rdg): Return NULL if
    compute_data_dependences_for_loop failed.

    * gfortran.dg/pr52835.f90: New test.

Added:
    trunk/gcc/testsuite/gfortran.dg/pr52835.f90
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-data-ref.c