[sdcc-devel] [ sdcc-Bugs-688922 ] Compiler fails to pass multiple byte arguments to functions

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Bugs item #688922, was opened at 2003-02-18 10:48
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=688922&group_id=599

Category: pic target
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Compiler fails to pass multiple byte arguments to functions

Initial Comment:
For the following test program:

void
int_function(int i)
{
  while(i--)
    ;
}

void
char_function(const char * s)
{
  while(*s++)
    ;
}

main()
{
  int_function( 10000 );
  int_function( 20000 );
  char_function("string1");
  char_function("string2");
}

the compile and the assembly work fine but the
generated code do not pass the arguments properly:

;  int_function( 10000 );
        MOVLW   0x10
        MOVWF   s0xFFF
        MOVLW   0x27
        CALL    _int_function

the parameter passed in W is discarded
ther is a missing "MOVWF   r0x56" in the generated
code:
;  int_function(int i)
        MOVF    s0xFFF,W
        MOVWF   r0x55
_00105_DS_
        MOVF    r0x55,W
        MOVWF   r0x57
        MOVF    r0x56,W
        MOVWF   r0x58

The same thing happens for the string address 
passing:
;  char_function("string1");
        MOVLW   LOW(__str_0+0)
        MOVWF   s0xFFF
        MOVLW   (((__str_0+0) >> 8)&0xff)
        CALL    _char_function
There is a mising "MOVWF   r0x5C" at the function 
start:
;  char_function(const char * s)
        MOVF    s0xFFF,W
        MOVWF   r0x5B
_00110_DS_
        CALL    _00116_DS_
        GOTO    _00117_DS_
_00116_DS_
        MOVF    r0x5C,W
        MOVWF   _PCLATH
        MOVF    r0x5B,W
        MOVWF   PCL

The bug is present in the latest CVS version. Test 
program attached
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