HLASM already does exactly that.  RTFM for EQU attributes.

sas


On 7/22/2017 9:54, graeme wrote:
I use r0:r15 for 32 bit reg references, g0:g15 for 64 bit reg references.

Where the instruction references, or sets, bits 0:31 of a 64 bit reg, I use the appropriate 
"gn" symbolic to identify the register, else I use the appropriate "rn" 
symbolic.

For the assembler to "police" this in some way I'd imagine having a set of 32 
directives like:
g0   gpr64 0
g1   gpr64 1
..
r0   gpr32  0
r1   gpr32  1
..

which would both define the symbols -and- authorise the assembler to issue a warning 
message if, for example, it found a "gpr32" symbolic used where an instruction 
operand references a 64 bit reg.

Cheers,
Graeme G.

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