http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53134
--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-04-27 10:23:42 UTC --- On Fri, 27 Apr 2012, bugdal at aerifal dot cx wrote: > Since even with the precision mode set correctly the exponent range of 387 fpu > registers still matches that of 80-bit long double, this mode would also imply > a store/load cycle after every single floating point operation, analogous to > -ffloat-store but on each step of calculation, not only on assignments. I I think it would also imply checks for subnormal results and fixups to avoid double rounding in those cases.
