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[Bug tree-optimization/76490] [5 Regression] when use -O2 -fcheck-founds compiler appears to hang and consumes all memory
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 24 Aug 2016 07:40:13 +0000
- Subject: [Bug tree-optimization/76490] [5 Regression] when use -O2 -fcheck-founds compiler appears to hang and consumes all memory
- Auto-submitted: auto-generated
- References: <bug-76490-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=76490
--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Aug 24 07:39:42 2016
New Revision: 239729
URL: https://gcc.gnu.org/viewcvs?rev=239729&root=gcc&view=rev
Log:
2016-08-24 Richard Biener <rguenther@suse.de>
Backport from mainline
2016-08-17 Richard Biener <rguenther@suse.de>
PR tree-optimization/76490
* tree-vrp.c (update_value_range): Preserve overflow infinities
when intersecting with ranges from get_range_info.
(operand_less_p): Handle overflow infinities correctly.
(value_range_constant_singleton): Use vrp_operand_equal_p
to handle overflow max/min correctly.
(vrp_valueize): Likewise.
(union_ranges): Likewise.
(intersect_ranges): Likewise.
(vrp_visit_phi_node): Improve iteration limitation to only
apply when we'll possibly re-visit the PHI via a changed argument
on the backedge.
* gfortran.fortran-torture/compile/pr76490.f90: New testcase.
* gcc.dg/pr52904.c: XFAIL.
Added:
branches/gcc-6-branch/gcc/testsuite/gfortran.fortran-torture/compile/pr76490.f90
Modified:
branches/gcc-6-branch/gcc/ChangeLog
branches/gcc-6-branch/gcc/testsuite/ChangeLog
branches/gcc-6-branch/gcc/testsuite/gcc.dg/pr52904.c
branches/gcc-6-branch/gcc/tree-vrp.c