[Bug tree-optimization/66642] transform_to_exit_first_loop_alt doesn't use result of low iteration count loop

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66642

--- Comment #6 from vries at gcc dot gnu.org ---
Author: vries
Date: Tue Jul  7 16:25:22 2015
New Revision: 225521

URL: https://gcc.gnu.org/viewcvs?rev=225521&root=gcc&view=rev
Log:
Add empty loop exit block in transform_to_exit_first_loop_alt

2015-07-07  Tom de Vries  <tom@codesourcery.com>

        PR tree-optimization/66642
        * tree-parloops.c (transform_to_exit_first_loop_alt): Update function
        header comment.  Rename split_edge variable to edge_at_split.  Split
        exit edge to create new loop exit bb.  Insert loop exit phis in new
loop
        exit bb.

        * testsuite/libgomp.c/parloops-exit-first-loop-alt-3.c (main): Test low
        iteration count case.
        * testsuite/libgomp.c/parloops-exit-first-loop-alt.c (init): New
        function, factor out of ...
        (main): ... here.  Test low iteration count case.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-parloops.c
    trunk/libgomp/ChangeLog
    trunk/libgomp/testsuite/libgomp.c/parloops-exit-first-loop-alt-3.c
    trunk/libgomp/testsuite/libgomp.c/parloops-exit-first-loop-alt.c