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Message-ID: <20250706210554.GI288056@port70.net>
Date: Sun, 6 Jul 2025 23:05:54 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: Damian McGuckin <damianm@....com.au>
Cc: MUSL <musl@...ts.openwall.com>
Subject: Re: __expo2.c (and __expo2f.c)
* Damian McGuckin <damianm@....com.au> [2025-07-06 18:51:01 +1000]:
>
> Hi,
>
> These handle exp(x) for the cases where |x| > log(???_MAX) where
> ??? is one of DBL or FLT.
>
> Is there any documentation behind these, that is other than the comments in
> the routines themselves?
i don't think so.
i think the comments should be clear, do you have something in mind?
maybe it could say that sign is either +1.0 or -1.0.
hyperbolic funcs need exp(x)/2 for large x where exp(x) would overflow
hence the __expo2(x,sign) trickery.
instead of INSERT_WORDS nowadays i'd probably just write
static const double scale = 0x1p1021; /* scale*scale = 2^(k-1) */
>
> Thanks - Damian
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