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Re: [avr-libc-dev] Math accuracy

From: Björn Haase
Subject: Re: [avr-libc-dev] Math accuracy
Date: Mon, 24 Apr 2006 00:21:24 +0200
User-agent: KMail/1.7.1

David Carr wrote on Montag, 24. April 2006 09:30 :
> Just for fun I ran the "savage" benchmark on my Mega16 at 6MHz.  I
> attempted to use double precision everywhere.  (I say attempted because
> I'm no expert at this.)
> A further test reveals (to me) that sizeof(float) == sizeof(double) == 4.
> Is there a way to have sizeof(double) == 8?
You would have to write floating point emulation for 8-byte double IEEE 
numbers. So far the only thing avr-libc is having is a FP emulation for 
4-byte floats (that is IIRC not fully IEEE compliant).
Presently there is no difference concerning the code if you are writing 
"double" or "float".


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