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diff --git a/openpower/sv/mv.vec.mdwn b/openpower/sv/mv.vec.mdwn
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+# move to/from vec2/3/4
+
+See <https://bugs.libre-soc.org/show_bug.cgi?id=230#c30>
+
+Basic idea: mv operations where either the src or dest is specifically marked as having SUBVL apply to it, but, crucially, the *other* argument does *not*.
+
+     mv.srcvec  r3, r4.vec2
+     mv.destvec r2.vec4, r5
+