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A comment on An introduction to reverse-engineering x86 microcode and writing it. Parent comment

Re:An introduction to reverse-engineering x86 microcode and ... by mschuster91 on Friday December 29, 2017 @10:59AM (#16030065)
> Only the last one can improve by hacking microcode

You can implement entirely new instructions in microcode.

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Re:An introduction to reverse-engineering x86 microcode and ... by madez on Saturday December 30, 2017 @01:25AM (#16034135)
The authors say in the talk that that likely wouldn't be significantly faster than the equivalent x86 instructions.
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