[PATCH] D108151: [NFC][clang] Use X86 Features declaration from X86TargetParser

[Erich Keane via Phabricator via cfe-commits]

erichkeane added inline comments.


================
Comment at: clang/lib/Basic/Targets/X86.cpp:1071
+    assert(llvm::is_contained(Priorities, Priority) &&
+           "Priorites don't form consequtive range!");
+  }
----------------
craig.topper wrote:
> erichkeane wrote:
> > If all you care about is whether they are a consecutive range, why not just use `std::is_sorted`?
> The Priorities array isn't sorted. It's just whatever order the X86_FEATURE_COMPAT lists them.
> 
> The values need to be unique and in a contiguous range.
Then I'd suggest something like: `llvm::sort`, then `assert *(end - 1) - *begin == std::distance(begin, end) && llvm::adjacent_find` or something.

I definitely didn't get that point out of this odd for-loop and is_contained.  There is perhaps at trick with std::min and std::max too.  Though, it looks like this is perhaps trying to prove that the range is 0 to the the array size, right?  In that case, perhaps there is something easier.

Also a nit, it is `consecutive` in that case.


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  https://reviews.llvm.org/D108151/new/

https://reviews.llvm.org/D108151