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The IA32 variant of InternalSyncCompareExchange64() is correct, but we can simplify it. We don't need to load the lower 32 bits of ExchangeValue into EBX in two steps (first into a general register, then into EBX); we can ask GCC to populate EBX like that itself. Cc: Liming Gao <liming.gao@intel.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1208 Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Acked-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>