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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/108130] New: [13 Regression] LTO compile time hog seen on
 bootstrap-lto config since r13-4684-g7450b25566b7a7
Date: Thu, 15 Dec 2022 15:47:05 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: ipa
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: compile-time-hog
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108130

            Bug ID: 108130
           Summary: [13 Regression] LTO compile time hog seen on
                    bootstrap-lto config since r13-4684-g7450b25566b7a7
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jamborm at gcc dot gnu.org, marxin at gcc dot gnu.org
  Target Milestone: ---

I noticed linking of e.g. cc1plus gets much slower in stage2 with a WPA hog=
 in:

    58.15%  lto1                [.] lto_symtab_encoder_lookup
    19.95%  lto1                [.] may_need_named_section_p
    18.77%  lto1                [.] rename_statics
     0.50%  lto1                [.] lto_symtab_encoder_lookup
     0.09%  lto1                [.] lto_symtab_encoder_encode_body_p

The WPA phase takes >5 minutes, while it used to take ~30 seconds on my
machine.=