[Bug rtl-optimization/64081] [5 Regression] r217827 prevents RTL loop unroll

[ienkovich at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64081

--- Comment #3 from ienkovich at gcc dot gnu.org ---
Author: ienkovich
Date: Mon Jan 19 13:58:54 2015
New Revision: 219842

URL: https://gcc.gnu.org/viewcvs?rev=219842&root=gcc&view=rev
Log:
gcc/

    PR rtl-optimization/64081
    * loop-iv.c (def_pred_latch_p): New function.
    (latch_dominating_def): Allow specific cases with non-single
    definitions.
    (iv_get_reaching_def): Likewise.
    (check_complex_exit_p): New function.
    (check_simple_exit): Use check_complex_exit_p to allow certain cases
    with exits not executing on any iteration.

gcc/testsuite/

    PR rtl-optimization/64081
    * gcc.dg/pr64081.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/pr64081.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/loop-iv.c
    trunk/gcc/testsuite/ChangeLog