On Mon, Jul 04, 2016 at 11:45:42AM +1000, sisyphus1@xxxxxxxxxxxxxxx wrote: > ld is: 7fff8000000000000000 This is +Inf in 80-bit 8087 format. > f128 is: 7fff8000000000000000000000000000 This is a NaN in standard format (Inf would be 7fff0000000000000000000000000000). > It's only when this long double value is cast to __float128 that it behaves > as a NaN. > > Where to from here ? Look at the generated machine code for the cast? The value returned from strtold looks correct. Segher
