On 02/13/2018 11:46 AM, Tom Hughes wrote:
Given that -mcet seems to turn on extra instructions is this not an
issue for compatibility with older processors? or are they sequences
which decode as no-ops on older processors?


They are NOPs on all current CPUs. They trap on some older CPUs, but we coordinated this change with the x86 SIG to make sure that it matches their requirements.

Thanks,
Florian
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