[Bug middle-end/38474] compile time explosion in dataflow_set_preserve_mem_locs at -O3

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38474

--- Comment #77 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Dec  9 15:13:07 2013
New Revision: 205808

URL: http://gcc.gnu.org/viewcvs?rev=205808&root=gcc&view=rev
Log:
2013-12-09  Richard Biener  <rguenther@suse.de>

    PR middle-end/38474
    * tree-ssa-structalias.c (set_union_with_increment): Remove
    unreachable code.
    (do_complex_constraint): Call set_union_with_increment with
    the solution delta, not the full solution.
    (make_transitive_closure_constraints): Merge the two
    constraints.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-structalias.c