Date: Tue, 30 Jul 2013 04:26:21 +0200 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: Conformance issues to address after 0.9.12 release * Rich Felker <dalias@...ifal.cx> [2013-07-29 17:04:48 -0400]: > On Mon, Jul 29, 2013 at 06:00:46PM +0200, Szabolcs Nagy wrote: > > * Rich Felker <dalias@...ifal.cx> [2013-07-29 02:34:56 -0400]: > > > - i387 math asm does not truncate excess precision. Whether or not > > > this omission is conforming in terms of the return value, it results > > > in lost underflow exceptions, as demonstrated by nsz's math tests. > > > > the underflow problem is not i387 or excess precision related: > > many (odd) math functions are almost the identity function > > around x==0 (sin,asin,tan,atan,sinh,atanh,..) > > In the case of asin, etc it _is_ the excess precision. > ah yes functions with x87 asm are different but the c code for asin has the issues i described so it should fail to raise underflow on arm as well
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