[sdcc-devel] [ sdcc-Bugs-805445 ] Z80: bitwise XOR write back bug

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

Bugs item #805445, was opened at 2003-09-12 20:13
Message generated for change (Comment added) made by epetrich
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=805445&group_id=599

Category: z80 port
>Group: fixed
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Akiya ISHIDA (akiya-i)
>Assigned to: Erik Petrich (epetrich)
Summary: Z80: bitwise XOR write back bug

Initial Comment:
"int ^= int;" is compiled into wrong code.



Sample code doing "a^=b;", this line was compiled into 



	ld	a,6(ix) ; load low byte of b

	xor	a,4(ix) ; xor with low byte of a

	ld	4(ix),a ; write back to low byte of 

axor lowbyte

	ld	a,7(ix) ; load high byte of b

	xor	a,5(ix) ; xor with high byte of a

	ld	4(ix),a ; write high byte back to not 

HIGH but LOW BYTE of a!!

			; '4(ix)' should be '5(ix)'



source: (xor.c)

int *xor(int a,int b)

{

	a ^= b;

	return &a;

}





sdcc version:

  SDCC : 

mcs51/gbz80/z80/avr/ds390/pic14/pic16/TININative/xa51

/ds400 2.3.5 (Aug 18 2003) (UNIX)



compile option:

  sdcc -mz80 -c xor.c

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

>Comment By: Erik Petrich (epetrich)
Date: 2003-09-12 21:16

Message:
Logged In: YES 
user_id=635249

Fixed in src/z80/gen.c 1.118



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

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=100599&aid=805445&group_id=599