From: Michael Schierl <schierlm@gmx.de>
To: Andreas Enge <andreas@enge.fr>
Cc: guix-devel@gnu.org
Subject: Re: Procps in core-updates
Date: Mon, 20 Mar 2023 21:02:01 +0100 [thread overview]
Message-ID: <83194a1d-4589-aed9-09a3-5d1495d06699@gmx.de> (raw)
In-Reply-To: <ZBhzvdPsXmFnrCkr@jurong>
Hello Andreas,
Am 20.03.2023 um 15:54 schrieb Andreas Enge:
> Hello Michael,
>
> I am attaching a simplified C file and the corresponding assembly
> output; which I cannot read, but there are differences between the two
> invocations of fprintf.
Seems that you accidentally attached the object file (binary) instead of
the assembly output. :-)
> The weirdest thing is that actually the value is the integer 123. So it
> should be stored in any kind of register exactly.
123 as a normalized binary floating point number would be
1.921875 × 2⁶
and you would have to represent the mantissa in binary (1.111011₂).
Still this should fit into most floating point registers easily.
But possibly the value computed by the algorithm of parsing the number
resulted in e.g.
1.111011000000000000000000000000000000000000000000000001011₂ × 2⁶
which is still 123 when converted back to a 52-bit mantissa, but
something ever so slightly larger when treated as an 80-bit float with
64 bits mantissa.
Or maybe I'm missing something :-)
Regards,
Michael
next prev parent reply other threads:[~2023-03-20 20:02 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-18 12:32 Procps in core-updates Andreas Enge
2023-03-18 17:38 ` Leo Famulari
2023-03-18 17:44 ` Andreas Enge
2023-03-19 17:36 ` Michael Schierl
2023-03-20 14:54 ` Andreas Enge
2023-03-20 20:02 ` Michael Schierl [this message]
2023-03-20 21:25 ` Andreas Enge
2023-03-19 17:49 ` Felix Lechner via Development of GNU Guix and the GNU System distribution.
2023-03-19 19:22 ` Kaelyn
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