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I've never seen such an instruction but I don't think it would help anyway. I believe that to avoid checker-boarding of memory, the system will often return an allocation larger than you asked for. For example if you ask for 64 bytes and it has a block of 96 bytes available it will give you that 96 rather than leave a (probably) unusable 32 byte "hole".


Jon Paris

www.Partner400.com
www.SystemiDeveloper.com



On Nov 19, 2010, at 12:35 PM, rpg400-l-request@xxxxxxxxxxxx wrote:

It *may* be possible to determine how much memory the system allocated for a
basing pointer using an MI instruction, but that allocated memory would
always be in increments of 16 bytes (at a minimum), so even if you could get
that value, all you'd really be able to figure out is that your
data-structure is no larger than that size.


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