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From: "meissner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug regression/103318] New: Spec 2017 benchmark perlbench_r fails
 on PowerPC for -Ofast and -O3, passes with -O2
Date: Thu, 18 Nov 2021 16:13:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103318

            Bug ID: 103318
           Summary: Spec 2017 benchmark perlbench_r fails on PowerPC for
                    -Ofast and -O3, passes with -O2
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
          Assignee: unassigned at gcc dot gnu.org
          Reporter: meissner at gcc dot gnu.org
  Target Milestone: ---

The Spec 2017 benchmark perlbench_r compiles fine but produces the wrong ou=
tput
when compiled with -O3 or -Ofast options on both power9 and power10.  Using=
 -O2
produces the right results on power10.  In going back with the previous runs
that I've done on power10, it worked with sources checked out on October 17=
th,
but failed with sources checked out on November 4th and November 17th.

For power10, the options that I use are:
-g -mlittle -save-temps=3Dobj -ffast-math -Ofast -mcpu=3Dpower10 -mrecip \
-funroll-loops -m64  -fgnu89-inline -Wno-multichar -DSPEC_LP64 \
-frandom-seed=3Dspec2017 -D_XOPEN_SOURCE=3D500 -DSPEC_LINUX_PPC_LE \
-fno-strict-aliasing -std=3Dgnu11 -Wno-builtin-macro-redefined -w=