Well, let's see#

Sat, 09 Feb 2002 03:28:57 +0000

Well, let's see. Now we're using the software fpcontrol register, with ffi calls to read and write it using ieee[sg]etfpcontrol(). We've lost the ability to set the rounding mode, but the evidence so far available suggests that only insane people want to do that anyway. The rest appears to be working, except that in sigfpe-handler we're using the current fpcontrol instead of the one in the sigcontext. This is because (according to grep *.[chS], anyway) the kernel appears not to ever fill in the scfp_control slot in the sigcontext. The one I looked at certainly didn't seem to contain the right answer.

OK, so we have more-working-than-it-was Alpha floating point, at least. In fact, as we actually look up which trap went off when we get a SIGFPE, we presently have more featured fp support on Alpha than we do on x86. Someone who cares can fix up x86 equivalently.

The Phoenix was showing Spinal Tap last night. Definitely worth watching