> Meh, PoP is now behind a paywall, trying to get through ... I wonder > if there's a nice online html documenting the s390 len_load/store > instructions to better understand the need for the bias.
https://publibfp.dhe.ibm.com/epubs/pdf/a227832c.pdf Look for vector load with length (store). The length operand specifies the highest bytes to load instead of the actual length. Regards Robin