[sdcc-devel] [ sdcc-Bugs-1195691 ] Z80 assembler does not support 'CP <byte>' opcode

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Bugs item #1195691, was opened at 2005-05-05 07:12
Message generated for change (Comment added) made by maartenbrock
You can respond by visiting: 
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Category: assembler
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Z80 assembler does not support 'CP <byte>' opcode

Initial Comment:
I'm trying to use as-z80 from sdcc 2.4.0 to build a
very simple assembly program.  The code in question
looks like this:

  BKSP    =       0x08

  START:  call    CLS
  LOOP:   call    GETCH
          ld      A,H

          bit     0,L
          jp      Z,DISPLAY

          cp      BKSP        ; This line causes an error.
          jp      NZ,LOOP

          xor     A
          ret

The assembler fails with the following error on the
'cp' opcode:

  Error: <a> machine specific addressing or addressing
mode error

My reading of the various Z80 materials I've found
online suggests that this is a perfectly valid opcode
and addressing mode (compiling to FE<byte>).  The same
code compiles fine on other assemblers (crasm, z80-asm).

th...@ya...



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>Comment By: Maarten Brock (maartenbrock)
Date: 2005-05-05 09:31

Message:
Logged In: YES 
user_id=888171

I'm not sure but I think this is what's going on. Immediate 
operands are represented as #n in as-z80. Try:
BKSP = #0x08
cp BKSP

Please report back with your results.

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