[sdcc-devel] [ sdcc-Bugs-883855 ] SDCC generating incorrect code for pointer decrement

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Bugs item #883855, was opened at 2004-01-24 23:24
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Category: msc51(8051) target
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Onno Kortmann (onno)
Assigned to: Nobody/Anonymous (nobody)
Summary: SDCC generating incorrect code for pointer decrement

Initial Comment:
Hi, I'm in the progress of porting Adam Dunkels uip
(see http://www.dunkels.com/adam/uip/) to SDCC/8051.

Appended is a fragment which is essentially a scaled
down version of memb.c in A. Dunkels code which shows a
rather strange behaviour. If you run it with the marked
line commented out, it will not execute the decrement
of ptr2's content. I also tested the -- operator, this
gives the same result. If you add the dummy function
call, it works.

I invoke sdcc as 

sdcc --i-code-in-asm --model-large -c

The --model-large seemingly makes no difference.
My version of sdcc is SDCC :
mcs51/gbz80/z80/avr/ds390/pic14/pic16/TININative/xa51/ds400/hc08
2.3.5 (Nov 19 2003) (UNIX) from debian testing.

The board I'm testing this code on uses an Atmel AT89S8252.

Thanks for any help,

Best regards

Onno

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