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Date: Thu, 11 Oct 2007 09:52:58 +0200
From: Angelo Graziosi <Angelo DOT Graziosi AT roma1 DOT infn DOT it>
To: Marco Atzeri <marco_atzeri AT yahoo DOT it>
cc: newlib AT sources DOT redhat DOT com, cygwin AT cygwin DOT com
Subject: Re: A problem with tgamma function
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In any case, it seems that 'tgamma' has some problem, as this bug report
says (your results are the same):

    http://sources.redhat.com/bugzilla/show_bug.cgi?id=5159


   Angelo.


On Thu, 11 Oct 2007, Marco Atzeri wrote:

>
> --- Angelo Graziosi <Angelo DOT Graziosi AT roma1 DOT infn DOT it> ha
> scritto:
>
> >
> > For the sake of completeness I want to flag this.
> >
> > A recent failure of GFortran tests, regarding the
> > usage of GAMMA
> > functions, results in the following problem with
> > 'tgamma' on Cygwin
> > (gcc-3.4.4-3):
>
> Not confirmed on latest snapshot
>
> $ uname -vo
> 20070920 12:04:04 Cygwin
>
> $ gcc -v
> Reading specs from
> /bin/../lib/gcc/i686-pc-cygwin/3.4.4/specs
> Configured with:
> /usr/build/package/orig/test.respin/gcc-3.4.4-3/configure
> --verbose --prefix=/usr --exec-prefix=/usr
> --sysconfdir=/etc --libdir=/usr/lib
> --libexecdir=/usr/lib --mandir=/usr/share/man
> --infodir=/usr/share/info
> --enable-languages=c,ada,c++,d,f77,pascal,java,objc
> --enable-nls --without-included-gettext
> --enable-version-specific-runtime-libs --without-x
> --enable-libgcj --disable-java-awt --with-system-zlib
> --enable-interpreter --disable-libgcj-debug
> --enable-threads=posix --enable-java-gc=boehm
> --disable-win32-registry --enable-sjlj-exceptions
> --enable-hash-synchronization --enable-libstdcxx-debug
> Thread model: posix
> gcc version 3.4.4 (cygming special, gdc 0.12, using
> dmd 0.125)
>
>
> > $ ./a.exe
> > Segmentation fault (core dumped)
>
> ./a.exe
> Arg: 18.5, Exact: 1.4986121e+15, tgamma:
> 1.4986145e+15, diff: 1.6121044e-06
> Arg: 19.5, Exact: 2.7724323e+16, tgamma: 2.772436e+16,
> diff: 1.3167939e-06
> Arg: 23.5, Exact: 5.3613034e+21, tgamma:
> 5.3612978e+21, diff: 1.0500245e-06
> Arg: 29.5, Exact: 1.6348124e+30, tgamma:
> 1.6348178e+30, diff: 3.3277006e-06
> Arg: 30.5, Exact: 4.8226972e+31, tgamma:
> 4.8226831e+31, diff: 2.9078208e-06
> Arg: 31.5, Exact: 1.4709225e+33, tgamma:
> 1.4709265e+33, diff: 2.7352257e-06
> Arg: 32.5, Exact: 4.633406e+34, tgamma: 4.6333912e+34,
> diff: 3.2061253e-06
> Arg: 33.5, Exact: 1.5058569e+36, tgamma:
> 1.5058626e+36, diff: 3.7881605e-06
> Arg: 34.5, Exact: 5.0446211e+37, tgamma:
> 5.0446287e+37, diff: 1.5077254e-06
>
> Regards
> Marco
>
>
>
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