[sdcc-devel] [ sdcc-Bugs-700121 ] sdcc does not clear high byte here

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Bugs item #700121, was opened at 2003-03-08 23:52
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=700121&group_id=599

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Frieder Ferlemann (frief)
Assigned to: Nobody/Anonymous (nobody)
Summary: sdcc does not clear high byte here

Initial Comment:
// The code does not make much sense, but the result is not OK. 
// hl_byte doesn't clear high byte.  
// Recent cvs. Generated .asm is appended. (z80 looks similar). 
 
unsigned int hl_byte(unsigned int i) 
{ 
    i = 0xabcd; 
    i&= 0x00ff; 
    return i; 
} 
 
main() 
{ 
    while( 0x00cd !=  hl_byte(0x1234) ) 
        ; 
} 
 
 
 
#if 0 
 
;test.c:5: unsigned int hl_byte(unsigned int i) 
;       ----------------------------------------- 
;        function hl_byte 
;       ----------------------------------------- 
_hl_byte: 
;test.c:9: return i; 
;     genRet 
        mov     dpl,#0xCD 
00101$: 
        ret 
 
#endif 

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>Comment By: Bernhard Held (bernhardheld)
Date: 2003-03-10 14:10

Message:
Logged In: YES 
user_id=203539

?
It's a bug, don't know why you're talking about arguments. 
Look at the return value of hl_byte()!

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Comment By: Jan Rejlek (jare)
Date: 2003-03-10 13:49

Message:
Logged In: YES 
user_id=672939

I think that this is completely O.K.,  because the arguments
in C are passed by value ind therefore the function cannot
change the argument in the calling function.

Regards,
Jan Rejlek

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=700121&group_id=599