[sdcc-devel] [ sdcc-Bugs-3566114 ] z80 memset bug

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Bugs item #3566114, was opened at 2012-09-09 12:10
Message generated for change (Comment added) made by 
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Category: z80 port
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: gp2k00 ()
Assigned to: Nobody/Anonymous (nobody)
Summary: z80 memset bug

Initial Comment:
With two calls to memset() in the same function using constant expressions one of them will get the incorrect address.  In fact, it appears to re-use the address of the first call.

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>Comment By: gp2k00 ()
Date: 2012-09-09 12:15

Message:
membug.c contains build instructions, compiler version and more specifics
of the problem which I'd meant to put in the description.

This excerpt from membug.asm shows HL loaded with 0x8000 in both instances
rather than 0x9000 in second as it should.

;membug.c:9: memset((char *)0x8000, 1, 0x1000);
        ld      hl,#0x8000                                                 
                    ; Correct
        ld      (hl), #0x01 
        ld      e, l
        ld      d, h
        inc     de
        ld      bc, #0x0FFF
        ldir
;membug.c:10: memset((char *)0x8000 + 0x1000, 2, 0x1000);
        ld      hl,#0x8000                                                 
                    ; WRONG
        ld      (hl), #0x02
        ld      e, l
        ld      d, h
        inc     de
        ld      bc, #0x0FFF
        ldir
        ret
_main_end::

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