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Message-ID: <20210205201229.GD2447252@port70.net>
Date: Fri, 5 Feb 2021 21:12:29 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: Paul Zimmermann <Paul.Zimmermann@...ia.fr>, musl@...ts.openwall.com
Subject: Re: issue with sinhf
* Szabolcs Nagy <nsz@...t70.net> [2021-02-05 21:09:34 +0100]:
> * Paul Zimmermann <Paul.Zimmermann@...ia.fr> [2021-02-05 09:01:09 +0100]:
> > $ cat test_sinh_musl.c
> > #include <stdio.h>
> > #include <stdlib.h>
> > #include <math.h>
> >
> > int
> > main ()
> > {
> > float x = 0x1.62e4p+6;
> > float y = sinhf (x);
> > printf ("x=%a y=%a\n", x, y);
> > }
> ...
> > $ gcc -fno-builtin test_sinh_musl.c $FILES
> > $ ./a.out
> > x=0x1.62e4p+6 y=-nan
>
> this seems to be a bug, attaching a fix
that one was for the acoshf bug, the sinhf issue was a bug
in expm1f (overflowed too early, although sinhf could have
used a less tight threshold that would have prevented this
causing an issue there)
View attachment "0001-math-fix-expm1f-overflow-threshold.patch" of type "text/x-diff" (1128 bytes)
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