(no commit message)

diff --git a/openpower/sv/biginteger.mdwn b/openpower/sv/biginteger.mdwn
index 6a7392e9cc90609a78d7601f13a79be83b730f6f..83122ee5005acea44cbda3b8bca9961b2303812d 100644 (file)
--- a/openpower/sv/biginteger.mdwn
+++ b/openpower/sv/biginteger.mdwn
@@ -59,7 +59,9 @@ is Z23-Form in "overwrite" on RT.
 
 Both instructions take two 64-bit sources, concatenate
 them together then extract 64 bits from it, the offset
-location determined by a third source.
+location determined by a third source.  So as to avoid
+costly 4-reg (VA-Form) a 2-bit mode `sm` gives four
+potential overwrite and zero-source options instead.
 
 # maddedu