[libcxx-commits] [libcxx] [libc++] <experimental/simd> Fix conversion constructor (PR #74693)

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joy2myself wrote:

@ldionne If I understand correctly, you want me to compare `long double`s within a error tolerance. I pushed a the code about it. But in my local test, this does not seem to solve the problem under the `-O3` option. The `long double` does not seem to have an error, but is not written correctly.

https://github.com/llvm/llvm-project/pull/74693