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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