(no commit message)

diff --git a/openpower/sv/compliancy_levels.mdwn b/openpower/sv/compliancy_levels.mdwn
index adadccb217f961eeb32cd5ba97c209bef81ca8e8..65c79446894da64651ce497f13fb9921aa6b8125 100644 (file)
--- a/openpower/sv/compliancy_levels.mdwn
+++ b/openpower/sv/compliancy_levels.mdwn
@@ -18,6 +18,13 @@ To achieve full soft-emulated interoperability, all implementations
 all SPRs including all reserved SPRs, all SVP64-related Context
 instructions (REMAP), as well as for the entire SVP64 Prefix space.
 
+*Even if the Power ISA Scalar Specification states that a given
+Scalar
+instruction need not or must not raise an illegal instruction on UNDEFINED
+behaviour, unimiplemented parts of SVP64 *MUST* raise an illegal
+instruction trap when (and only when)
+that same Scalar instruction is Prefixed*.
+
 Summary of Compliancy Levels, each Level includes all lower levels:
 
 * **Ultra-embedded**: `setvl` instruction and context-switching of SVSTATE