News to me and I could not find any trace in the archives.

 

With z/OS v1.8 and later, r15 behavior has changed for a conditional
storage obtain/getmain.  For a successful request, the register may
contain: 00000010_00000000

 

IBM has (poorly) documented this behavior at
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/IEA2A980/67.2
.8?SHELF=IEA2BK80&DT=20070514031429&CASE=

 

Which states:

When running in an AMODE64 environment, only the low half of GPR15
contains a return code. There is no guarantee for the contents of the
high half of GPR15. 

 

IOW, do not use LTGR to test for a successful getmain/storage obtain
unless preceded by LLGFR.

 

...chris.

 

bmcsoftware

10431 Morado Circle

Austin, Tx. 78759

 


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