Ludovic Courtès wrote: > >> Should we conclude that this is a GCC bug? > > > > Possibly. And what result do you get with "gcc -mieee" ? > > It works (returns 1). > > The GCC manual (info "(gcc) DEC Alpha Options") reads this: > > `-mieee' > > [...] > This option generates code fully IEEE compliant code [...] > > The resulting code is less efficient but is able to correctly > support denormalized numbers and exceptional IEEE values such as > not-a-number and plus/minus infinity.
OK. So my conclusion is that without -mieee flag (or -ieee for cc), the compiler does not deal with NaNs. GCC probably optimizes more aggressively than cc in this case. > So people compiling with GCC on this platform should pass `-mieee' > (`configure' could add it automatically.) The gnulib module 'fpieee' adds it automatically. Bruno
