[Bug tree-optimization/88217] [8 Regression] Compile time and memory hog w/ -O2 -fstrict-enums -fno-tree-forwprop -fno-tree-fre

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88217

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Nov 28 13:04:27 2018
New Revision: 266557

URL: https://gcc.gnu.org/viewcvs?rev=266557&root=gcc&view=rev
Log:
2018-11-28  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/88217
        * vr-values.c (vr_values::extract_range_from_phi_node): Make
        sure to handle results > +INF and < -INF correctly when
        trying to drop down to +INF - 1 or -INF + 1.

        * g++.dg/pr88217.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/pr88217.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/vr-values.c