From what I understood from that link, /Qspectre is for variant 1, while retpoli... | Hacker News

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cesarb on Jan 24, 2018 | parent | context | favorite | on: The new microcode from Intel and AMD adds three ne...

From what I understood from that link, /Qspectre is for variant 1, while retpoline is for variant 2, so it's not equivalent.

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