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Re: [Help-gsl] Double vs Long Double
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From: |
Brian Gough |
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Subject: |
Re: [Help-gsl] Double vs Long Double |
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Date: |
Tue, 09 Oct 2007 09:41:40 +0100 |
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User-agent: |
Wanderlust/2.14.0 (Africa) Emacs/22.1 Mule/5.0 (SAKAKI) |
At Fri, 5 Oct 2007 18:31:01 +0000 (GMT),
dave wrote:
> With xmm registers present in an x86, fp can be computed either using the NPX
> math unit
> or else using the xmm registers. Would changing 'double' to 'DOUBLE'
> everwhere in the GSL
> source and then adding -DDOUBLE='long double' or -DDOUBLE='double' to the
> CFLAGS work as a
> means of generating either a library that used NPX temp real mode or a
> library using XMM
> double mode?
No, it's not that simple unfortunately. Without support from the
compiler it's not possible to work with extended precision for every
operation.
--
Brian Gough
Network Theory Ltd,
Publishing Free Software Manuals --- http://www.network-theory.co.uk/