[PATCH 1/2] z80, gas: follow historical assemblers and allow "op A,x" and "op x"

[Jan Beulich]

On 13.10.2025 22:25, H. Peter Anvin wrote:
> For arithmetic ops, Z80 syntax wants "op A,x" for ADD, ADC and SBC and
> "op x" for SUB, AND, OR, XOR, and CP. Many historical assemblers
> simply treat them orthogonally; allowing but not requiring the "A,"
> operand for any of these operations. This is widely used in legacy
> source code, and there is no reason not to.
> 
> Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Knowing nothing about the arch, this looks okay to me. Have you organized
yourself commit rights, or will this need committing on your behalf?

Jan