[sdcc-devel] [ sdcc-Bugs-1652561 ] Bad code generated for Parity flag

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Bugs item #1652561, was opened at 2007-02-05 17:51
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Jan Rejlek (jare)
Assigned to: Nobody/Anonymous (nobody)
Summary: Bad code generated for Parity flag

Initial Comment:
This function always returns even parity:

#include <8051.h>

bit getParity(char c)
{
	ACC = c;
	return P;
}

return !P; or return !(!P); works well.

Compiled with SDCC Version 2.6.3 #4543 (Dec 31 2006) invoked by command sdcc -c test.c.


The Parity flag is overwritten by clearing accumulator before it is used.

;	genReceive
	mov	_ACC,dpl
;	test.c:6: return P;
;	genRet
	clr	a    <--- the P flag is overwritten here
	mov	c,_P
	rlc	a
	add	a,#0xff
;	Peephole 500	removed redundant label 00101$
	ret


Best Regards
Jan

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