Thanks a lot... This is almost the state I was when I left work today. I never thought, that will be sufficient ;-) I'll give feedback on Monday (tomorrow's holiday --> loooong weekend ;-)
Tobi On Wed, 2008-05-21 at 19:02 +0200, Uros Bizjak wrote: > Hello! > > > I am currently evaluation the feasiblitiy to add (real) 64-doubles to the > > capabilities of the avr-gcc. The current state is, that the avr-gcc > > supports floats and alias them to doubles. However, a prospective project > > demands the resolution (accordung to their research), and therefore the > > company needing it might sponsor me to implement the support. > > > > However, beside some trivial patches, I am not familiar with gcc hacking. > > Therefore it is hard for me to estimated how long this will take, but the > > numbers are cruicial to deside if I get the assignement. > > > > As far as I dugg into the gcc source, there is a soft-float library which > > is used widely among non-FPU targets. However, I am currently missing the > > link, how the target has to be configured to be aware of that. As I am > > currently stuck with that, I'd appreciate any hint, link, documents etc > > which might point me into the right direction. > > > > > > Add this code to avr/t-avr: > > --cut here-- > LIB2FUNCS_EXTRA = fp-bit.c dp-bit.c > > dp-bit.c: $(srcdir)/config/fp-bit.c > cat $(srcdir)/config/fp-bit.c > dp-bit.c > > fp-bit.c: $(srcdir)/config/fp-bit.c > echo '#define FLOAT' > fp-bit.c > cat $(srcdir)/config/fp-bit.c >> fp-bit.c > --cut here-- > > then update avr/avr.h with > > #define FLOAT_TYPE_SIZE 32 > #define DOUBLE_TYPE_SIZE 64 > #define LONG_DOUBLE_TYPE_SIZE 64 > > If everything works as expected, then you have just added soft-fp > support to avr. > > Uros.
