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Re: [avr-gcc-list] 32 bit double precision

From: Rolf Ebert
Subject: Re: [avr-gcc-list] 32 bit double precision
Date: Wed, 22 Jun 2005 08:10:51 +0200
User-agent: Opera M2/7.54 (Win32, build 3929)

On Tue, 21 Jun 2005 19:13:20 -0700, intiha Ho gai <address@hidden> wrote:

I am planning to do floating point calculations. I tried to look at
the precision of doulbe on the avr-gcc manual, but other than that it
is 32 bit I couldnt find the number of bits for the mantissa/exponent.
Also, is there a good tutorial on optimizing performance under such
precision constraints ( I know 32 bit are not doing the job for me
directly :( ).

32 bit floats have 23 bits mantissa, which corresponds roughly to 6 decimal digits.

One is usually spoiled by the 15 decimal digits of doubles on desktop computers. I wonder which algorithm that you want to run on an AVR depends on 15 digits. Most algorithms work quite well in 6 digits.


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