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From: "hejinyang at loongson dot cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107713] New: Wrong implementation atomic_exchange<short>
 on LoongArch
Date: Wed, 16 Nov 2022 03:07:34 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 13.0
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X-Bugzilla-Who: hejinyang at loongson dot cn
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107713

            Bug ID: 107713
           Summary: Wrong implementation atomic_exchange<short> on
                    LoongArch
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hejinyang at loongson dot cn
  Target Milestone: ---

Created attachment 53905
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53905&action=3Dedit
preprocessed file

Target: loongarch64-unknown-linux-gnu
Configured with: ../configure --prefix=3D/usr --libdir=3D/usr/lib64
--build=3Dx86_64-cross-linux-gnu --host=3Dloongarch64-unknown-linux-gnu
--target=3Dloongarch64-unknown-linux-gnu --enable-__cxa_atexit
--enable-threads=3Dposix --with-system-zlib --enable-libstdcxx-time
--enable-checking=3Drelease --with-build-sysroot=3D/opt/mylaos/sysroot
--enable-default-pie --enable-languages=3Dc,c++,fortran,objc,obj-c++,lto
gcc version 13.0.0 20220801 (experimental) (GCC)=20

test_of_sync_lock_test_and_set.c:
char lock;
char hello()
{
  return __sync_lock_test_and_set (&lock, 1);
}

Cmdline:
gcc test_of_sync_lock_test_and_set.c -S --save-temps

Output Fragment:
        1:
        ll.w    $r12,$r16,0
        and     $r19,$r12,$r14
        bne     $r19,$r15,2f          <--- Wrong
        and     $r19,$r12,$r17
        or      $r19,$r19,$r18
        sc.w    $r19,$r16,0
        beq     $zero,$r19,1b
        b       3f
        2:
        dbar    0x700
        3:=