There is one very simple reason there is no MVCY instruction:
the MVC instruction is 6 bytes long. Adding the two bytes needed
for long displacements would create an 8-byte instruction; the
zSeries (and ancestor) architecture(s) would require major
revisions to handle instructions longer than 3 halfwords.
John Ehrman
(------------------ Referenced Note Follows --------------------)
> From: IBM Mainframe Discussion List on behalf of Thomas Berg
> Sent: Tue 9/20/2005 9:10 PM
> Subject: Re: z/Architecture Principles of Operation (SA22-7832-04)
>
> Btw, why is there no "MVCY" instruction ?
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