We have some programs that need to support Y ops. I was planning to just switch the whole product to assemble with optable(yop) but I found PJ30456 which includes the unsettling comment:
New instructions must be assembled using the YOP instruction set on LINUX HLASM. The rest of the system is assembled against the ZOP instruction set >>> to avoid the use of long displacements. <<< Would this simply be so that the rest of the system would run on hardware without the long displacement facility (I assume this is a microcode level?), or is there some more serious issue I should be aware of? Ian ...
