Bug fixed showed by https://github.com/unicorn-engine/unicorn/pull/609
and the test case shows no problem on the most recent release.
** Changed in: qemu
Status: New => Fix Released
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Thanks for this bug report. The problem here is that QEMU is not
correctly handling the obsolete "unnormal" 80-bit floating point format.
The Intel architecture reference says that this should be handled by
raising the invalid-input exception and returning the default NaN.
See also the discussion