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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/102943] New: VRP threader compile-time hog
 with 521.wrf_r
Date: Tue, 26 Oct 2021 11:13:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102943

            Bug ID: 102943
           Summary: VRP threader compile-time hog with 521.wrf_r
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

Compiling 521.wrf_r with -Ofast -march=3Dznver2 -flto results in one LTRANS=
 unit
(unit 105) showing

 tree VRP threader                  : 122.22 ( 44%)   0.04 (  3%) 124.84 ( =
44%)
   18M (  2%)
 TOTAL                              : 280.88          1.23        286.88=20=
=20=20=20=20=20=20
  849M

note WRF is prone to run into RTL DF scalability issues as well where other
LTRANS units spend 40% of the compile-time in but the VRP threader issue is
new.=