[libc-commits] [libc] [libc][math] Prevent spurious floating-point exceptions in fdim (PR #228749)

[Chen Miao via libc-commits]

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ChenMiaoi wrote:

Indeed, I overlooked the isnan check. Using an if-statement directly works for float and double. However, in this example (https://godbolt.org/z/7xvTsb6hK), simply changing the type to `long double` still causes the issue on x86, both locally and with Clang trunk at `-O2`.

https://github.com/llvm/llvm-project/pull/228749