add comment about vector length / dot-product

diff --git a/simple_v_extension/vector_ops/discussion.mdwn b/simple_v_extension/vector_ops/discussion.mdwn
index 9f88759042446bdfff42228d1b3673dda9e87926..05e346d15a1fa23b39b14cc0ed92e7dbbb4b716d 100644 (file)
--- a/simple_v_extension/vector_ops/discussion.mdwn
+++ b/simple_v_extension/vector_ops/discussion.mdwn
@@ -127,6 +127,8 @@ From <https://github.com/suyashmahar/cordic-algorithm-python>
 
 # Vector Length
 
+<http://lists.libre-riscv.org/pipermail/libre-riscv-dev/2019-October/002982.html>
+
 > With VLENGTH being also expressible as dotproduct followed by scalar
 > sqrt, is it reasonable to have both normalisation as well as VLENGTH
 > as macro op fused sequences?