[sdcc-devel] [ sdcc-Bugs-3401973 ] code generator error

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Bugs item #3401973, was opened at 2011-09-01 04:26
Message generated for change (Comment added) made by spth
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Category: z80 port
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Lee Morrison (enigmalee)
>Assigned to: Philipp Klaus Krause (spth)
Summary: code generator error

Initial Comment:
sdcc.exe  -mz80 --nostdlib --nostdinc --fverbose-asm -I../include  -c buggy_dequeue.c

SDCC : z80/r2k/r4k/pic16/pic14/hc08 3.0.4 #6784 (Aug 30 2011) (CYGWIN)

see ASSERTS in the source code

I suspect it is a bug in an optimization pass.  A wrong value gets store in a file scope variable, and
the array update is lost.



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>Comment By: Philipp Klaus Krause (spth)
Date: 2011-09-14 17:15

Message:
Fixed in revision #6851.

Philipp


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Comment By: Philipp Klaus Krause (spth)
Date: 2011-09-02 10:27

Message:
The bug occours in line 39/40:
next_head = delay_next[delaying_task_head];
delay_next[delaying_task_head] = NULL_IDX;
iy is overwritten with &delaying_task_head, at the end of the code for
line 39, but line 40 assumes that it still holds delay_next +
delaying_task_head

I have added the attachment to sdcc in revision #6803 as regression test
bug3401973.c. It is disabled for the z80 until the bug is fixed.

Philipp


Philipp


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