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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/110015] New: openjpeg is slower when built with
 gcc13 compared to clang16
Date: Sun, 28 May 2023 19:15:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110015

            Bug ID: 110015
           Summary: openjpeg is slower when built with gcc13 compared to
                    clang16
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org
  Target Milestone: ---

I tried to reproduce openjpeg benchmarks from Phoronix
https://www.phoronix.com/review/gcc13-clang16-raptorlake/5

On zen3 hardware I get 42607ms for clang build and 45702ms for gcc build th=
at
is a 7% difference (Phoronix reports 10% on RaptorLake)

perf of clang build:
  88.64%  opj_t1_cblk_encode_processor
   6.68%  opj_dwt_encode_and_deinterleave_v
   1.30%  opj_dwt_encode_and_deinterleave_h_one_row

opj_t1_cblk_encode_processor is huge with no obvious hot spots.

perf of gcc build:

  70.36% opj_t1_cblk_encode_processor=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
  16.12% opj_t1_enc_refpass.lto_priv.0=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20
   3.88% opj_dwt_encode_and_deinterleave_v=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20
   2.46% pj_dwt_fetch_cols_vertical_pass=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
   2.35% opj_mqc_byteout=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20

So we apparently inline less even at -O3=