From: "McKown, John" <john.mck...@healthmarkets.com>
Sent: Tuesday, 28 August 2012 1:34 AM
Destroys the contents of R15, so I guess I would load R15 into, say, R0 and do
the OR operation on R0. However, I'm on
a z9 and will likely never be on anything more advanced. So I'll need to load
the mask into another register, say R1.
That would either require an L R1,variable or literal (=X'FFFFFFFC'), or do an:
AHI R1,X'04' followed by an LCR R1,R1.
I don't know which of those is "better". I guess the Load would be more easily
understood by even a novice.
LR R0,R15
L R1,=A(-4)
OR R0,R1
CR R0,R1
JNE BAD_RC
Simpler is:
SLL 15,30
LTR 15,15
BNZ ...
or, if worried about preserving R15
LR 0,15
SLL 0,30
LTR 0,0
BNZ ...
