Avi Kivity <avi@xxxxxxxxxx> wrote: > Even if Intel processors behave that way, other processors (real and > emulated) use those manuals as a specification. Emulated processors are > unlikely to touch an undefined register, but real processors may. > > (qemu tcg appears not to touch the output) Possibly because the AMD64 spec specifies that the destination will be unchanged if the source was 0. David -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html