On 11/8/2021 1:45 AM, Tony Thigpen wrote:
I decided to put the constant in-line and use BRAS to acquire it's
address:
AIF ('&PARM'(1,1) NE '''').N0004
BRAS &TREG,N2&SYSNDX
&TVAL SETC '&PARM'(2,K'&PARM-2)
N1&SYSNDX DC CL&SIZE'&TVAL'
N2&SYSNDX DS 0H
AGO .N0099
.N0004 ANOP
Back in the day, it was quite common to see this technique used in IBM
macros. However, they now use literals -- a better choice from a
performance perspective since I- and D-cache has been split since the
first z/Architecture boxes hit the market back in 1999. Because of this
split, an inline constant such as this will require a D-cache line be
populated from memory even though it's already present in the I-cache.
If this code is not in the performance path, then what you're doing
should be fine...
--
Phoenix Software International
Edward E. Jaffe
831 Parkview Drive North
El Segundo, CA 90245
https://www.phoenixsoftware.com/
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