[sdcc-devel] [ sdcc-Bugs-1365641 ] Assignments lost.

[SourceForge.net <no...@so...>]

Bugs item #1365641, was opened at 2005-11-24 16:18
Message generated for change (Settings changed) made by bernhardheld
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=1365641&group_id=599

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: grasbon (grasbon)
>Assigned to: Bernhard Held (bernhardheld)
Summary: Assignments lost.

Initial Comment:
Assignments lost.
-----------------

Version:
SDCC:
mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08
2.5.4 #1168 (Nov 24 2005) (MINGW32)

Call:
"sdcc Main.c"


In the following code, the assignments for 'i' in line
17 (i = 42) and line 24 (i = 24) of "main.c" are skipped.
Hence the P1-assignment in line 27 becomes wrong.

Here's the Main.c:
-------------------------

#include <8052.h>

void
main(void)
{
    unsigned char    i;
    unsigned char    u;
    static code char c = '?';

    u = 0;
    while( 1 )
    {   i=0;
        switch( u )
        {   case 0:
                P1 = 0;
                i = 42; // Absent in "main.asm"
                break;
            case 1:
                while( c != 'x' && i < 9 ) i++;
                break;
            default:
                P1 = 2;
                i = 24; // Absent in "main.asm"
        }
        P1 = i;
        u++;
    }
}


-------------------------


Therefor have a look at Main.asm, line 380 ff:
------------
  00101$:
  ;Main.c:16: P1 = 0;
  ;     genAssign
    mov _P1,#0x00
  ;Main.c:18: break;
---------
and line 416 ff:
---------
 00107$:
;Main.c:23: P1 = 2;
;     genAssign
    mov _P1,#0x02
;Main.c:26: }
---------



To turn off the peephole optimizer (--no-peep) has no
effect.


Reimar Grasbon



----------------------------------------------------------------------

Comment By: grasbon (grasbon)
Date: 2005-11-25 08:50

Message:
Logged In: YES 
user_id=1374486

Additional info: A workaround for that problem (in my
projects) is to disable the loop induction by using the
"--noinduction" option for compiling.

Reimar


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=1365641&group_id=599