[libc-commits] [libc] [libc][math][c23] Add linux/* entrypoints for nextup* and nextdown* (PR #85803)

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overmighty wrote:

> There already were entrypoints for linux/x86_64.

Maybe this would have been worth to add in the commit message. I first thought of naming the commit `[libc][math][c23] Add linux/{aarch64,arm,riscv} entrypoints for nextup* and nextdown*` but it seemed a bit too long (85 chars).

https://github.com/llvm/llvm-project/pull/85803