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Message-ID: <20120812124021.GE20243@port70.net>
Date: Sun, 12 Aug 2012 14:40:22 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Priorities for next release?
* Rich Felker <dalias@...ifal.cx> [2012-08-11 18:25:22 -0400]:
> Actually not quite as easy as I thought. Do we also want the float and
> ld versions? And how are they supposed to behave on inf/nan? I think
bsd only seem to have significand and significandf
so no ld version
actually the same is true for scalb
(musl declares scalbl but only defines
scalb and scalbf, so i guess scalbl can
be reomved from math.h)
> an optimal implementation would be something like:
>
> if (isnormal(x.d)) return x.rep = (x.rep&mask|exp_0), x.d;
> else return scalbn(x, -ilogb(x));
>
freebsd just returns scalbn(x, -ilogb(x))
we can do that as well
(eventhough it's not very efficient for normal values)
(the i386 asm version uses fxtract which does the same)
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