musl - Should asinf(x) raise underflow for subnormal 'x'

Message-ID: <6ee37dee-6e9-ed7e-1ba2-e565d7ac96ae@esi.com.au>
Date: Mon, 18 Aug 2025 16:43:46 +1000 (AEST)
From: Damian McGuckin <damianm@....com.au>
To: MUSL <musl@...ts.openwall.com>
Subject: Should asinf(x) raise underflow for subnormal 'x'

The routine correctly returns 'x' for subnormal 'x'.

For comparison, atan(x) for subnormal x returns 'x' and raises underflow.

Should not asinf(x) also do the same?

Also, should not both of these raise inexact when the result is small but 
still normal, i.e. the return value is just 'x'.

Curious - Damian

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