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From: "mednafen at sent dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/113255] New: wrong code with -O2 -mtune=k8
Date: Sat, 06 Jan 2024 23:24:09 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c
X-Bugzilla-Version: 13.2.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: mednafen at sent dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113255

            Bug ID: 113255
           Summary: wrong code with -O2 -mtune=3Dk8
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mednafen at sent dot com
  Target Milestone: ---
            Target: x86_64-pc-linux-gnu

Created attachment 57000
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57000&action=3Dedit
test case

Linux x86_64

$ /usr/local/gcc-13.2.0/bin/gcc -Wall -O2 -o sprite sprite.c && ./sprite
1

$ /usr/local/gcc-13.2.0/bin/gcc -Wall -O2 -mtune=3Dk8 -o sprite sprite.c &&
./sprite
0
Aborted


The problem appears to have started around version 10.2.0.=