https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71460
--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- On Wed, 8 Jun 2016, ch3root at openwall dot com wrote: > - padding in long double is not copied. Probably ok (in the same way as > padding > in substructures is not always copied); Yes, I think that's fine in struct copying. > - sNaNs are turned into qNaNs on x86-32 if traps are turned off. Probably ok > if > sNaNs and qNaNs are considered different representations of the same value; For *scalar* assignment that would be fine because of TS 18661-1 saying "Whether C assignment (6.5.16) (and conversion as if by assignment) to the same format is an IEC 60559 convertFormat or copy operation is implementation-defined, even if <fenv.h> defines the macro FE_SNANS_ALWAYS_SIGNAL (F.2.1).". It's rather less clear for struct assignment. I expect the present bug is essentially the same as bug 58416 (which concerns a union, where the floating-point member isn't even the active one).
