Read-Write Hazards on single-bit global resources, having a significant
detrimental effect.
-Consequently in SV, XER.SO and CR.OV behaviour is disregarded. XER is
+Consequently in SV, XER.SO and CR.OV behaviour is disregarded (including in cmp ibstructions) . XER is
simply neither read nor written. This includes when `scalar identity behaviour` occurs. If precise OpenPOWER v3.0/1 scalar behaviour is desired then OpenPOWER v3.0/1 instructions should be used without an SV Prefix.
An interesting side-effect of this decision is that the OE flag is now free for other uses when SV Prefixing is used.