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From: Loiseleur Michel <mloiseleur@linagora.com>
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Subject: [Qemu-devel] Re: QEMU x86_64:   sles 64,
 bug with floats (with test program) (3rd try)
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Date: Thu, 11 Jan 2007 11:00:13 -0000
To: qemu-devel@nongnu.org

Ludovic Drolez wrote:
> Hi !
>=20
> I've found a bug in Qemu x86_64 under a sles 64 10: conversion of float=
s=20
> to strings fails in some cases. For example, Ganglia (cluster monitorin=
g
>  software), shows random values and as well as PHP5 programs.
>=20
> Here is a simple test program to confirm that you have the same bug as =
me
> (maybe also under another distribution). Compile this and link with lib=
apr-1:
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3Dtest.=
c=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> #include <stdio.h>
> #include <math.h>
> #include <apr.h>
> #include <apr_strings.h>
>=20
> void main(void)
> {
>     char buf[60];
>     double d =3D M_PI;
>=20
>     snprintf(buf, 60, "%f\n", d);
>     printf(buf);
>     apr_snprintf(buf, 60, "%f\n", d);
>     printf(buf);
>=20
> }
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> Under a SLES 10/64 bits, you'll see something like:
> 3.141593
> 3.Oju=C3=A7_
>=20
> I tested with Qemu 0.8.2 and the CVS, but of course, it works on a real=

> system (a Dell PE1950).
>=20
> So it's a QEMU bug. Is it triggered by weird code produced by gcc 4.1.0=
 ? Or a
> FPU emulation bug ? Any ideas ?
>=20
A bug in apr, maybe, no ?


Rgds,
--=20
Michel Loiseleur