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diff --git a/openpower/sv/executive_summary.mdwn b/openpower/sv/executive_summary.mdwn
index ced048274023618d1072ae62d3e21dc46e4faa8d..f0e2ca470ac8e40e8ea971e4d79a8039b625d082 100644 (file)
--- a/openpower/sv/executive_summary.mdwn
+++ b/openpower/sv/executive_summary.mdwn
@@ -7,6 +7,12 @@ allocation of opcodes (five) to implement, whereas any other Vector
 implementation would require an intrusive fundamental overhaul of the
 Power ISA.
 
+*If not done as carefully as SVP64, the addition of any other Scalable
+Vector Extension would require a significant number of opcodes, putting
+further pressure on Major Opcode space which was never designed with
+Scalable Vectors in mind in the first place.  Contrast with RISC-V which was
+designed over a 7 year period with Cray-style Vectors right from the start.*
+
 It is extremely important to think of Simple-V as a 2-Dimensional ISA:
 instructions vertical and registers horizontal otherwise it will be
 difficult to grasp and appreciate its RISC simplicity.