https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68128
Bug ID: 68128
Summary: A huge regression in Parboil v2.5 OpenMP CUTCP test
(2.5 times lower performance)
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: t.artem at mailcity dot com
Target Milestone: ---
According to Phoronix,
http://www.phoronix.com/scan.php?page=article&item=fedora-2023-bench&num=4 ,
for Parboil v2.5 OpenMP CUTCP test GCC in Fedora 22/23 produces the code which
runs 2.5 times slower than the code produced by Fedora 20.
Fedora 20: GCC 4.8.2 (good performance)
Fedora 21: GCC 4.9.1 (good performance)
Fedora 22: GCC 5.1.1 with patches (huge regression)
Fedora 23: GCC 5.1.1 with even more patches (huge regression)
