Path: aioe.org!.POSTED!not-for-mail From: WE@completely.invalid (Wolfgang Ehrhardt) Newsgroups: comp.lang.pascal.misc Subject: ANN: DAMath for 64-bit FreePascal and Delphi Date: Wed, 06 Feb 2013 08:40:38 GMT Organization: Aioe.org NNTP Server Lines: 32 Message-ID: <5112162f.5321...@news.aioe.org> NNTP-Posting-Host: 2H8GDv+gP2BXBhuPU9DKHA.user.speranza.aioe.org X-Complaints-To: ab...@aioe.org X-Notice: Filtered by postfilter v. 0.8.2 X-Newsreader: Forte Free Agent 1.21/32.243 Xref: aioe.org comp.lang.pascal.misc:305 The DAMath archive contains units for double precision accurate mathematical methods without using multi precision arithmetic or assembler. The main purpose is to make the AMath functions available for 64-bit system without Extended Precision or 387-FPU, but they can be used with 32-bit systems. Native Delphi has made some of progress for the 64-bit numerical math routines (there still great inaccuracies for some functions in specific ranges), but unfortunately native FreePascal shows some very bad results: On Win64 from the 53 bits of double precision it looses up to - 28 bits for trigonometric functions (sin,cos etc, range <= 1e10) - 26 bits for lnxp1 (range 0..1e-4), despite the fact that lnxp1 is specifically designed for small arguments - 13 bits for sinh (whole range) - 13 bits for exp (arg range 500..700) and more examples. On Win7/64 the 64-bit DAMath one argument elementary transcendental functions and power have peak relative errors < 4.4e-16, the RMS values are < 1.3e-16. DAMath is open source (zlib license) available from <http://wolfgang-ehrhardt.de/misc_en.html#damath> _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-devel
Since the zlib license is compatible with the (modified) LGPL, it
should be possible to reuse parts of that unit to improve/replace
parts of our softfloat code in rtl/inc/softpu.pp (used on win64 and
pretty every non-x86 platform).
