llvm / llvm/llvm-project

[libc][math] pre-rounding underflow raises FE_UNDERFLOW

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libc
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Description

#186734 Shows that `FE_UNDERFLOW` could be raised when the pre-rounding intermediate value underflows (even if the final rounded result might not).

We should investigate other functions and add tests covering “pre-rounding underflow” cases where applicable.

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