> > -----Original Message----- > > From: > > avr-libc-dev-bounces+eweddington=cso.atmel....@nongnu.org > > [mailto:avr-libc-dev-bounces+eweddington=cso.atmel....@nongnu. > > org] On Behalf Of Dave N6NZ > > Sent: Saturday, December 20, 2008 5:39 PM > > Cc: avr-libc-dev@nongnu.org > > Subject: Re: [avr-libc-dev] 64-bit doubles > > > > 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? > > Yes, we need to have both the library support, as well as the compiler > support. The compiler work might be easier than the library work, but > this is just conjecture. > > Eric
For the moment I am thinking of implementing fp doubles as the typedef "longfp" in long longs. As Preston has mentioned, this would be outside the compiler. They would have the IEEE format, ie 52-bit mantissa and 11-bit exponent. Obviously not the most efficient but very testable. Ron E-mail message checked by Spyware Doctor (6.0.0.386) Database version: 5.11380 http://www.pctools.com/en/spyware-doctor-antivirus/ _______________________________________________ AVR-libc-dev mailing list AVR-libc-dev@nongnu.org http://lists.nongnu.org/mailman/listinfo/avr-libc-dev
