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From: Lonnie VanZandt <lonnie.vanzandt@ngc.com>
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Subject: Re: Number of significand bits in long double?
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On Thursday 04 August 2005 10:26 am, Steve Kargl wrote:
> Can someone confirm or refute that the long double type
> has 53 bits in its significand on i386?  Which header
> file in /usr/include provides this info?

Would a reference such as 
http://babbage.cs.qc.edu/IEEE-754/IEEE-754references.html help you?