amd64: Fix 32b cmpxchg unmodified register writeback #63
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32b register writes are zero-extended. In case a register should not be modified by cmpxchg, preserve the entire 64b value. Discovered via QEMU differential tests.
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32b register writes are zero-extended. In case a register should not be modified by cmpxchg, preserve the entire 64b value. Discovered via QEMU differential tests.
Submitted upstream at https://bugs.kde.org/show_bug.cgi?id=275024#c1