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x86: Decode AMD "Extended Feature Extensions ID EBX" bits

Description

x86: Decode AMD "Extended Feature Extensions ID EBX" bits

In particular, this determines CPU support for the CLZERO instruction.

(No, I am not making this name up.)

Sponsored by: Dell EMC Isilon

Details

Provenance
cemAuthored on
Parents
rS323821: Document r323333, pw(8) allow empty secondary group list.
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