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由 Nadav Amit 提交于
The emulator does not emulate the xadd instruction correctly if the two operands are the same. In this (unlikely) situation the result should be the sum of X and X (2X) when it is currently X. The solution is to first perform writeback to the source, before writing to the destination. The only instruction which should be affected is xadd, as the other instructions that perform writeback to the source use the extended accumlator (e.g., RAX:RDX). Signed-off-by: NNadav Amit <namit@cs.technion.ac.il> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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