http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47977
--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2011-03-04 15:35:20 UTC --- On Fri, 4 Mar 2011, m.lazzarotto at robox dot it wrote: > My target is effectively an e500v2. > I also tried to pass -mabi=spe, with no difference in the output. > Is using --enable-e500-double compile-time equivalent to use -mdouble-float > runtime? It is roughly equivalent to -mfloat-gprs=double - but it may not work sensibly except for the e500-specific targets such as powerpc-eabispe. And this is only useful with -mabi=spe. e500v2 should follow the soft-float ABI (in particular, double arguments are passed in two GPRs, not one; the only time all 64 bits of a GPR are used for argument passing or return is for SPE vectors). Because of the error-prone nature of passing all the required options manually, I advise configuring for powerpc-eabispe.
