[PATCH] D67897: Fix __is_signed builtin

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith added a comment.

In D67897#1678388 <https://reviews.llvm.org/D67897#1678388>, @Quuxplusone wrote:

> But `std::is_signed_v<float>` needs to yield `false`.


It should yield `true`; the spec says "If is_­arithmetic_­v<T> is true, the same result as T(-1) < T(0); otherwise, false".


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  https://reviews.llvm.org/D67897/new/

https://reviews.llvm.org/D67897