for both INT and FP.
* **reduce mode**. If used correctly, a mapreduce (or a prefix sum)
is performed. See [[svp64/appendix]].
- Note that there are comprehensive caveats when using this mode.
+ Note that there are comprehensive caveats when using this mode,
+ and it should not be confused with the Parallel Reduction [[sv/remap]].
* **pred-result** will test the result (CR testing selects a bit of CR
and inverts it, just like branch conditional testing) and if the
test fails it is as if the *destination* predicate bit was zero even