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Message-ID: <CA+fZqCU0JtM1h_4yfWQgDmUv6Ln0JjB0tymDNzzPO1Kt9=M5dg@mail.gmail.com>
Date: Tue, 30 Aug 2022 12:17:50 +0200
From: ardi <ardillasdelmonte@...il.com>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: Do you recommend using fmt_fp() and
On Tue, Aug 23, 2022 at 7:30 PM Rich Felker <dalias@...c.org> wrote:
>
> See how strtod.c uses sh_fromstring and how sh_fromstring does not
> define any io callbacks (so that calling __uflow would necessarily
> result in a call to a null or ununitialized function pointer). From
> that, it's clear that it must not be reachable (or the existing code
> in musl would be broken).
Thanks a lot. Understood. While in the process of adapting the code,
I came across the implementation of scalbnl(), and I'm not sure if
I found a mistake or if it's correct: lines 23 to 27 of src/math/scalbnl.c
use MANT_DIG but hardcode it as 113 both when long double is
binary128 and when it's 80bit extended (where MANT_DIG is 64).
By comparison, looking at the source of the scalbn() versions for
float and double, I'd say there's a mistake in the long double version,
but I've never written that function myself, so I'm not in a position
to affirm it for sure.
Kind regards, and thanks a lot,
César
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