[sdcc-devel] [ sdcc-Bugs-3559997 ] Z80: Wrong code generated for structure handling

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Bugs item #3559997, was opened at 2012-08-20 16:13
Message generated for change (Comment added) made by mz-fuzzy
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Category: z80 port
Group: None
Status: Open
Resolution: None
>Priority: 7
Private: No
Submitted By: Martin Matyas (mz-fuzzy)
Assigned to: Nobody/Anonymous (nobody)
Summary: Z80: Wrong code generated for structure handling

Initial Comment:
Attached example generates wrong code using command line:
sdcc -mz80 -c  --max-allocs-per-node 60000 sdccerr.c 
See sdcc.lst:
- lines 95, 95 - hl is populated by function parameter 'i'
- line 104 - ldir is done with bc=4, causing hl to be incremented by 4
- lines 120-126 - structure pointed by 'i' is being populated using hl, but hl points 4 bytes forward already - changed by ldir!

problem does not occur when omitting --max-allocs-per-node.

SDCC : mcs51/gbz80/z80/z180/r2k/r3ka/ds390/pic16/pic14/TININative/ds400/hc08/s08 3.2.1 #8054 (Jul 25 2012) (Linux)

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>Comment By: Martin Matyas (mz-fuzzy)
Date: 2012-08-20 16:14

Message:
increasing priority as a wrong code is generated silently.

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