On Thu, Apr 20, 2023 at 12:52:48AM -0700, Matthew R. Wilson wrote: > I have gcc-generated .s files built with -mcpu=power9 -mfloat128 and > they generated `bl __gcc_qadd` to perform the addition, which is why I > started going down the path of looking into the built-in functions. > > But sure enough, I just tried it with my local GCC and it does directly > generate the xsaddqp instructions now. So I'm not sure what went wrong > with the compiler flags or whatever else with the earlier tests I have. You used "long double" and you didn't use "-mabi=ieeelongdouble". You can instead use "__ieee128" for the types, which will always work (for some version of "always"... You need to compile for at least a power8). Segher
