[sdcc-devel] [ sdcc-Bugs-772861 ] optimizer too optimistic, uses stale data

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Bugs item #772861, was opened at 2003-07-17 04:00
Message generated for change (Settings changed) made by epetrich
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Category: None
Group: None
Status: Open
>Resolution: Accepted
Priority: 5
Submitted By: Bjorge Dijkstra (zzaxxon)
>Assigned to: Erik Petrich (epetrich)
Summary: optimizer too optimistic, uses stale data

Initial Comment:
sdcc sometimes produces code that uses stale data.
e.g. in the attached sample code the contents of array
s1[k]
is stored in a sloc.
The program continues and k is changed. 
Another check of s1[k] uses the previously stored value
at the sloc instead of getting the new value for s1[k].

1. sample code attached (bug.c)

2. command line used to compile:
    sdcc -c bug.c

3. sdcc version:
 SDCC :
mcs51/gbz80/z80/avr/ds390/pic14/pic16/TININative/xa51/ds400
2.3.5 (Jul 15 2003) (UNIX)

4. n/a

5. bj...@gm...



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