[Bug libc/18128] New: m68k: broken 64bit atomics

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18128

            Bug ID: 18128
           Summary: m68k: broken 64bit atomics
           Product: glibc
           Version: 2.20
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: schwab@linux-m68k.org
                CC: drepper.fsp at gmail dot com
              Host: m68k-*-*

>From atomic_exchange_and_add:

               "   add%.l %2,%1;"                      \
               "   addx%.l %R2,%R1;"                  \

This is backwards.

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