[Bug middle-end/90726] exponential behavior on SCEV results everywhere

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90726

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Jun  5 08:26:36 2019
New Revision: 271950

URL: https://gcc.gnu.org/viewcvs?rev=271950&root=gcc&view=rev
Log:
2019-06-05  Richard Biener  <rguent...@suse.de>

        PR middle-end/90726
        * tree-ssa-loop-niter.c (expand_simple_operations): Do not
        turn an expression graph into a tree.

        * gcc.dg/pr90726.c: Enable IVOPTs.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/pr90726.c
    trunk/gcc/tree-ssa-loop-niter.c