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Re: [avr-libc-dev] 64-bit doubles

From: Dave N6NZ
Subject: Re: [avr-libc-dev] 64-bit doubles
Date: Sat, 20 Dec 2008 16:38:36 -0800
User-agent: Thunderbird 1.5 (X11/20051201)

Ron Kreymborg wrote:
-----Original Message-----
From: Weddington, Eric [mailto:address@hidden
Sent: Sunday, 21 December 2008 6:00 AM
To: Ron Kreymborg; address@hidden
Subject: RE: [avr-libc-dev] 64-bit doubles

-----Original Message-----
org] On Behalf Of Ron Kreymborg
Sent: Saturday, December 20, 2008 5:03 AM
To: address@hidden
Subject: [avr-libc-dev] 64-bit doubles

A quick look at AVR Libc for 20081205 still lists doubles as
only 32-bit. Is
this so? If yes does anyone know of a 64-bit double library?
I am pointing
heliostats and 32-bits are just not enough.

Hi Ron,

Yes, that is correct. Floats and doubles are 32-bits. No, I don't know
of a library. We (the avr-libc developers) have been advertising for
volunteers to help put together 64-bit double support for quite some
time. Nobody has volunteered yet.

Eric Weddington

Ok. For this project my good sense is saying go to a mcf52xx or M16C and a
commercial compiler, but I have written fp code for now ancient processors
and used the CORDIC transformations for transcendentals, so I'll have a look
at AVRs over the xmas break. No promises...


Is support for 64 bit double limited only by availability of a math library? I would expect that 8-byte variables, register allocations, etc, would also be an issue, since avr-gcc doesn't have anything bigger than a 32-bit long or 32-bit float right now.

Isn't there some compiler infrastructure that would have to happen also?


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