[libc-commits] [libc] [libc][math][c23] Add entrypoints and tests for totalorder{, f, l, f128} (PR #100593)

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overmighty wrote:

The x86 80-bit extended precision format is a bit more complicated than the IEEE binary formats. Maybe the current logic in `fputil::totalorder` doesn't work for the x86 80-bit format, I haven't looked into why exactly the `totalorderl` tests are failing.

https://github.com/llvm/llvm-project/pull/100593