Greetings! Rick Younie <[EMAIL PROTECTED]> writes:
> Camm Maguire wrote: > > Greetings! I have one Debian machine (m68k) which is producing very > > small numerical discrepancies on the results of the two floating point > > intensive tests in rtest8.mac: > > Hi, > > That rang a bell. There's this in the gcc man page: > > -ffloat-store > Do not store floating point variables in registers. This pre- > vents undesirable excess precision on machines such as the 68000 > where the floating registers (of the 68881) keep more precision > than a double is supposed to have. > > For most programs, the excess precision does only good, but a > few programs rely on the precise definition of IEEE floating > point. Use `-ffloat-store' for such programs. That did it -- thanks! As Richard Fateman observed, its quite surprising the magnitude of the difference was so large. Apparently m68k has the more accurate answer, right? In any case, I'm adding -ffloat-store to gcl's compile flags on m68k to avoid testing problems. Take care, > > Rick > -- > > -- Camm Maguire [EMAIL PROTECTED] ========================================================================== "The earth is but one country, and mankind its citizens." -- Baha'u'llah
