Thanks, but the purpose of a mnemonic is to help you remember.
That' s the general idea, but it' s effectiveness usually depends on the associativity capability of the users neurons
and when the number of abbreviations grows the objective gets more difficult to achieve
Hence L, LA, LM, LR all do a Load of one sort or another. I could give you bunches of examples of this, but I don't think you need that.
What I would like to know precisely is this, does the "G" or the "GF" that have been included have such a mnemonic meaning?
depends of what You intend for precise and mnemonic...
if You had read and meditated a few seconds on the paragraph
General Instructions for 64-Bit Integers
( in page 1-2 of the z/Architecture Principles of Operation SA22-7832-08 )
The 32-bit-binary-integer instructions of ESA/390
have new analogs in z/Architecture that operate on
64-bit binary integers. There are two types of analogs:
â€¢ Analogs that use two 64-bit binary integers to
produce a 64-bit binary integer. For example, the
ESA/390 ADD instruction (A for a storage-to-register
operation or AR for a register-to-register
operation) has the analogs AG (adds 64 bits from
storage to the contents of a 64-bit general register)
and AGR (adds the contents of a 64-bit general
register to the contents of another 64-bit
general register). These analogs are distinguished
by having â€œGâ€ in their mnemonics.
â€¢ Analogs that use a 64-bit binary integer and a
32-bit binary integer to produce a 64-bit binary
integer. The 32-bit integer is either sign-extended
or extended on the left with zeros, depending on
whether the operation is signed or unsigned,
respectively. For example, the ESA/390 ADD (A
or AR) instruction has the analogs AGF (adds 32
bits from storage to the contents of a 64-bit general
register) and AGFR (adds the contents of bit
positions 32-63 of a 64-bit general register to the
contents of another 64-bit general register).
These analogs are distinguished by having â€œGFâ€
in their mnemonics.
You would have had no need to ask ...
but if You do not trust the IT developer and You want to double check
You will have to go thru all the instructions with the G and the GF and check accordingly
You indicate "Grande" as an example. Is this of your own design?
stupid remark/question when I answer I always check that reasonable evidence exists
if You had googled for 'grande instructions' You would have found quite a few references
SHARE presentations, Assembler manuals from Tachyon and Dignus,
unfortunately, unless I missed something, nothing explicit IBM
Often, having the real meaning of the letter(s) is helpful in understanding it's use.
as said before ... depends on the associativity capability of the users neurons
and on having read and understood the above quoted paragraph
Oh, just as aside, I wrote my first ibm bal program for a 360 in 77
irrelevant to the discussion, i did that quite a few years before that
such a long experience should have warned You on the obscure ways of IBM
but on the other side the quote from the manual is not that obscure
if you post a few of these, it will help someone clarify for you. . . I'm not sure which instructions you are asking about
Dick! seems to me that the gentleman is just arguing about the G and GF <mnemonicity>