On Sat, Jun 24, 2017 at 11:27:47AM +0200, Martin Husemann wrote: > On Fri, Jun 23, 2017 at 10:27:40PM +0200, Kamil Rytarowski wrote: > > 3. Disable float128 in libstdc++ for everybody. > > You are missing the obvious one: > > 4. Disable float128 for all architectures that have no hardware support > for it (this would basically be all 32bit ones plus a few 64bit, > including x68_64 IIUC) and where the ABI does not require this > format for long double (for example sparc64). > > Providing this format for anything else just makes no sense to me. > The availability should not depend on the compiler used.
I am similarly skeptical about whether we should expose a floating point format not supported by the hardware and which is likely to cause ill-written or ill-configured applications to run slowly with software floating point and precision they don't actually need, instead of quickly with hardware floating point and enough precision already. Thor
