Date: Wed, 08 May 2019 20:16:50 +0000 From: bugzilla-noreply@freebsd.org To: numerics@FreeBSD.org Subject: [Bug 237800] pow(3) returns inaccurate results Message-ID: <bug-237800-18636-R8M7CtVYjJ@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-237800-18636@https.bugs.freebsd.org/bugzilla/> References: <bug-237800-18636@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D237800 --- Comment #4 from sgk@troutmask.apl.washington.edu --- When you say you get the correct value on Linux, are you using clang 8.0.0 = on Linux or some version of gcc? gcc will constant fold pow(10,29) using MPFR= .=20 Clang will generated a call to pow() in libm. In any event, the library is computing pow(10,29) as exp(29*log(10)) where special polynomial approximations are being used. With a ULP of 0.51, I suppose reading Goldberg's paper is merited. --=20 You are receiving this mail because: You are the assignee for the bug.=
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