Date: Sun, 12 Aug 2012 23:02:26 -0000 From: Stephen Montgomery-Smith <stephen@missouri.edu> To: Bruce Evans <brde@optusnet.com.au> Cc: Diane Bruce <db@db.net>, John Baldwin <jhb@freebsd.org>, David Chisnall <theraven@freebsd.org>, Bruce Evans <bde@freebsd.org>, Steve Kargl <sgk@troutmask.apl.washington.edu>, David Schultz <das@freebsd.org>, Peter Jeremy <peter@rulingia.com>, Warner Losh <imp@bsdimp.com> Subject: Re: Use of C99 extra long double math functions after r236148 Message-ID: <500E09FE.8020607@missouri.edu> Resent-Message-ID: <20120812230219.GB20453@server.rulingia.com> In-Reply-To: <20120724100014.I934@besplex.bde.org> References: <5004A5C7.1040405@missouri.edu> <5004DEA9.1050001@missouri.edu> <20120717040118.GA86840@troutmask.apl.washington.edu> <20120717042125.GF66913@server.rulingia.com> <20120717043848.GB87001@troutmask.apl.washington.edu> <20120717225328.GA86902@server.rulingia.com> <20120717232740.GA95026@troutmask.apl.washington.edu> <20120718001337.GA87817@server.rulingia.com> <20120718123627.D1575@besplex.bde.org> <20120722121219.GC73662@server.rulingia.com> <20120722220031.GA7791@server.rulingia.com> <20120723141319.P1189@besplex.bde.org> <500CD98E.9080103@missouri.edu> <500D6182.8010003@missouri.edu> <20120724100014.I934@besplex.bde.org>
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I am committing the software - as is - to you guys. I feel that I worked extremely hard to get an error less than about 3.8 ULP (from 10,000,000 test cases) for the complex arc-trig and arc-hyperbolic functions. My skill is writing numerical software that works, with an awareness of where various numerical issues might arise. I am very proud of the work I have done in the last few days. Now this software requires a different skill set, getting it to conform to various styles, looking for smart efficiencies to overcome defects in the compiler, and checking that NaN's work properly. This is a skill set which you guys have in far greater amounts than I have. And it is something that doesn't engage my interest. If you find problems, like unwanted overflows/underflows or numerical errors occurring in edge cases, then by all means get back to me, and I will attempt to fix it. Thus far, the only fault I have found so far is in catanh, where I forgot to set the "inexact flag" when computing "hp" and "hm" when |y| is very small. I will still continue working hard on getting the numerics in clog to work correctly. Stephen
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