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diff --git a/openpower/sv/implementation.mdwn b/openpower/sv/implementation.mdwn
index 71e9925ba606d04aeed8197921c2a5219ed6a2d2..2f62b8ec55c43cdb6db24b6573086b3310b694cb 100644 (file)
--- a/openpower/sv/implementation.mdwn
+++ b/openpower/sv/implementation.mdwn
@@ -140,9 +140,11 @@ unit tests:
 
 * GPR
 * SPRs (yes, really: mtspr and mfspr are SV Context-extensible)
-* Condition Registers
+* Condition Registers.  see note below
 * FPR (if present)
 
+When Rc=1 is encountered in an SVP64 Context the destination is different (TODO) i.e. not CR0 or CR1.  Implicit Rc=1 Condition Registers are still Vectorised but do **not** have EXTRA2/3 spec adjustments.  The only part if the EXTRA2/3 spec that is observed and respected is whether the CR is Vectorised (isvec).
+
 ## Increasing register file sizes
 
 TODO.  INTs, FPs, CRs, these all increase to 128.  Welcome To Vector ISAs.