Update v.tex

1 files changed, 4 insertions, 0 deletions

diff --git a/src/v.tex b/src/v.tex
index 7bd62d7..2d24696 100644
--- a/src/v.tex
+++ b/src/v.tex
@@ -389,6 +389,10 @@ The number of vector predicate registers supported in
   predicate registers, but it is not clear these would be used
   frequently enough to warrant increased the architectural cost for
   all implementations.
+  
+  roger: we should force the minimum number of vp registers to 2, so that vp0
+   and vp1 are always available to the compiler. This would work nicer with
+   the encoding that has a bit that allows selecting vp0 or vp1.
 \end{discussion}
 
 When {\tt vnp} is 0, any instruction that reads a vector predicate