add TODO on vector config state as a "stack"

diff --git a/simple_v_extension/specification.mdwn b/simple_v_extension/specification.mdwn
index 65c5d43dbaaa0adfa904a501dcc1b735194c5f6a..3d2fd080303affd44e99bfff8d1d76076d3c2335 100644 (file)
--- a/simple_v_extension/specification.mdwn
+++ b/simple_v_extension/specification.mdwn
@@ -2157,4 +2157,11 @@ TODO: update elwidth to be default / 8 / 16 / 32
 TODO: document different lengths for INT / FP regfiles, and provide
 as part of info register. 00=32, 01=64, 10=128, 11=reserved.
 
+---
+
+push/pop of vector config state:
+<https://groups.google.com/d/msg/comp.arch/bGBeaNjAKvc/z2d_cST7AgAJ>
 
+when Bank in CFG is altered, shift the "addressing" of Reg and
+Pred CSRs to match.  i.e. treat the Reg and Pred CSRs as a
+"mini stack".