You should consider how IBM macros such as STORAGE handle this
situation. It requires an absolute value for LENGTH, and if you want to
generate it dynamically, or get it from a memory location, then the user
will just have to get the value into a register himself. The two
options are an absolute value, or a register (indicated by parentheses).
If you must provide both options, either use a different operand (say,
ALENGTH=), or a cryptic option (such as LENGTH=(*,address); or just
parentheses if register notation isn't needed). Generally, though,
having such flexibility is not worth saving the user 1 instruction.
Ultimately, there is no completely valid way for a macro to determine
whether a symbol is intended to be the value or the address of the
value. In fact, there's not any solid reason why a bare number couldn't
be a valid address.
sas
On 11/2/2013 11:39, [email protected] wrote:
I have a simple macro
AMOVE &L=LENGTH,&S=SOURCE,&T=Target
L R15,&L .Length Of Move
...
...
MVCL Ra,Rb
MEXIT
MEND
In a Macro I wish to generate 3 different instructions depending on the value
supplied for &L.
If I specify AMOVE L=LENGTH
I want the macro to generate a LOAD Of a Full Word
L Rz,LENGTH
LENGTH DS F
If I Specify AMOVE L=32767
I want the macro to generate a Load Addres
LA Rz,32767
If I specify AMOVE L=EQUATE
I want the macro to generate a Load Address of
LA Rz,EQUATE
EQUATE EQI (*-BEGIN)
Could someone please provide an example as to how to test for
the conditions above in a Macro.
Paul D'Angelo
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