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From: "meissner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/103498] New: Spec 2017 imagick_r is 2.62% slower on
 Power10 with pc-relative addressing compared to not using pc-relative
 addressing
Date: Tue, 30 Nov 2021 16:14:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103498

            Bug ID: 103498
           Summary: Spec 2017 imagick_r is 2.62% slower on Power10 with
                    pc-relative addressing compared to not using
                    pc-relative addressing
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: meissner at gcc dot gnu.org
  Target Milestone: ---

I was doing some Spec 2017 rate runs on a single power10 little endian 64-b=
it
CPU.  One of the runs disabled pc-relative addressing.  One benchmark
(imagick_r) was faster if PC-relative addressing was disabled.

For this run I used the options:
    -DSPEC \
    -DNDEBUG \
    -I. \
    -DSPEC_AUTO_SUPPRESS_OPENMP \
    -g \
    -save-temps=3Dobj \
    -Ofast \
    -mcpu=3Dpower10 \
    -mrecip \
    -funroll-loops \
    -msave-toc-indirect \
    -mno-pcrel \
    -fgnu89-inline \
    -Wno-multichar \
    -DSPEC_LP64 \
    -frandom-seed=3Dspec2017=