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[X86] AMD Zen 3: same-reg CMP is a zero-cycle dependency-breaking instruction

Authored by lebedev.ri on May 9 2021, 1:45 PM.

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[X86] AMD Zen 3: same-reg CMP is a zero-cycle dependency-breaking instruction

As measured by exegesis, and confirmed by ref docs.

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Committed
lebedev.riMay 9 2021, 2:03 PM
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rG9a31efa2f51b: [NFC][X86][MCA] AMD Zen 3: add tests for CMP dependency breaking
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