Public bug reported:
Binary package hint: libatomic-ops-dev
AO_compare_double_and_swap_double_full in sysdeps/gcc/x86.h has
val1/val2 registers swapped, causing all updates to fail.
(Don't take my word for it though. Reading the x86 documentation makes
my head hurt.)
** Affects: libatomic-ops (Ubuntu)
Importance: Undecided
Status: New
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cmpxchg8b arguments backwards
https://bugs.launchpad.net/bugs/148293
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