KanRobert wrote:

> @KanRobert , any comments?

Okay for me. Is there a perf data? 

BTW, could we  have a better name
```
def TuningPreferSetCC
    : SubtargetFeature<"prefer-setcc", "PreferSetCC", "true",
                       "Prefer to emit legacy SetCC.">;
```
To me, `SETZUCC`  is also a kind of SetCC with zero upper semantic, this name 
is a little confusing. 

https://github.com/llvm/llvm-project/pull/173965
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