[Sdcc-user] Variable Allocation bug ? [Was] Bug in SDCC, ( mcs51 port ??)

[Story, L. <Lenny.Story@Alcatel.com>]

greetings,

The problem you are seeing can happen if optimizers are turned on.
Specifically the peep optimizer, as it changes the code at the last =
possible
moment before emitting the actuall instructions. The compiler can not =
know
that locations have changes, in fact the stack can have gaps because of =
it.=20

You can set the Environment variable "SDCC_DEBUG_VAR_STORAGE" and it =
will
tell you which areas the variables are allocated too.

Write back if you still have issues.

-Lenny


-----Original Message-----
From: Martin Helmling [mailto:mh...@oc...]
Sent: Tuesday, May 06, 2003 2:55 AM
To: sdc...@li...
Subject: [Sdcc-user] Bug in SDCC, ( mcs51 port ??)


Hi,

there is a bug in the sdcc compiler, to generate the correct allocated=20
register name to debug output and assembler :

example.c:

typedef unsigned char uchar;

uchar usecount[8][2];

uchar cacheTxStatus( uchar n )
{
     return n + 5;
}

void cacheTxAnalogValue( uchar n, uchar m )
{

}

void _main (void)
{
     uchar i,j,ok;

     for ( i=3D0 ; i < 8 ; i++ )
     {
         ok =3D cacheTxStatus( i );
         if ( ok )
         {
             for ( j=3D0 ; j < 7 ; j++ )
                 cacheTxAnalogValue(i,j);
             ok =3D 5;
         }
         for ( j=3D0 ; j < 2; j++ )
         {
             usecount[i][j] =3D ok;
         }
     }

}

output of example.asm:

;------------------------------------------------------------
;Allocation info for local variables in function '_main'
;------------------------------------------------------------
;i                         Allocated to registers
;j                         Allocated to registers
;ok                        Allocated to registers r3
;------------------------------------------------------------

and example.adb:

S:L_main$i$1$1({1}SC:U),R,0,0,[]
S:L_main$j$1$1({1}SC:U),R,0,0,[]
S:L_main$ok$1$1({1}SC:U),R,0,0,[r3]

really in the code  i is mapped to r2 and j is mapped to r4, so code is =
ok.

--=20

Thanks

Martin Helmling

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