Motion 4: revised wording
I agree with the rationale, but what bothers me is that the motion
itself appears to exclude variants of 754-2008 explicitly designed
to simplify support of IA. Such a deviation would most likely be
under some configuration control, e.g. a new FP control bit that
says "in directed rounding modes, do this rather than that", so
that most of ordinary FP arithmetic (with default rounding) would
not be affected. Nevertheless, setting this bit would technically
render the system non-754-compliant, *unless* 754-2013 explicitly
supports that mode...
Now if the motion said "except for minor deviations specifically
designed to help IA, or known not to affect IA", it would be ok.
The second caveat would cover things like missing subnormals.
Michel.
---Sent: 2009-04-10 18:45:15 UTC