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Message-ID: <20140411154813.GS26358@brightrain.aerifal.cx>
Date: Fri, 11 Apr 2014 11:48:13 -0400
From: Rich Felker <dalias@...ifal.cx>
To: musl@...ts.openwall.com
Subject: Re: Preparing for releases 1.1.0 and 1.0.1
On Fri, Apr 11, 2014 at 11:17:00AM -0400, Morten Welinder wrote:
> > 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.
Are you basing this on a reading of how long double is used in the
source file, or just generalities? The rounding logic depends on
exactly how many places are kept/dropped when a certain addition is
performed.
Rich
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