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From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: Re: Preparing for releases 1.1.0 and 1.0.1
Date: Fri, 11 Apr 2014 17:47:54 +0200	[thread overview]
Message-ID: <20140411154752.GW3034@port70.net> (raw)
In-Reply-To: <CANv4PN=cbSuaLc_=BJ8QX20UpoKh9imJ5ixL3qC4cYL_gHLKwQ@mail.gmail.com>

* Morten Welinder <mwelinder@gmail.com> [2014-04-11 11:17:00 -0400]:
> > Yes but this leads to serious breakage if the compiler does not handle
> > the request to drop precision in a conforming way, and it still
> > doesn't help the fact that strtod depends on long double semantics.
> 
> Are you sure?
> 
> If the incoming number has at most 53 bits then there will be at most
> 24 bits left after the 2^(1+28) reduction.  The scalings by 10^9 = 2^9 * 5^9
> require at most log2(5^9) ~ 21 extra bits.
> 
> That ought to fit in valgrind's double.

formatting floats (other than %a) would work with the fixed rounding

but scanning or strtod can't be fixed easily


  reply	other threads:[~2014-04-11 15:47 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-10  2:40 Rich Felker
2014-04-10 13:11 ` Szabolcs Nagy
2014-04-11  1:39   ` Rich Felker
2014-04-11  9:46     ` Szabolcs Nagy
2014-04-11 13:07       ` Rich Felker
2014-04-11 15:17         ` Morten Welinder
2014-04-11 15:47           ` Szabolcs Nagy [this message]
2014-04-11 15:48           ` Rich Felker
2014-04-11 15:51             ` Rich Felker
2014-04-11 17:34               ` Morten Welinder

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