[sdcc-devel] [ sdcc-Bugs-974835 ] Bug in bit logical operation.

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Bugs item #974835, was opened at 2004-06-17 09:25
Message generated for change (Tracker Item Submitted) made by Item Submitter
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Category: msc51(8051) target
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Bug in bit logical operation.

Initial Comment:
#include "8051.h"
unsigned char value;
//--------------------------------
// This does not work..P1_2 is always 1, even if 
value=2...
//--------------------------------
void func1()
   {
      P1_2= (value==2)? 0: ~P1_0;
      
     return;
   }

//This Works fine( same job):-   
void func2()
   {
      if(value==2)
         P1_2=0;
      else
         P1_2= ~P1_0;

      return;
   }
//===========================

The 1st function (func1())is compiled (erroneously)as 
below(I have removed the genxxx & peephole comments)
_func1:
	ar2 = 0x02
	ar3 = 0x03
	ar4 = 0x04
	ar5 = 0x05
	ar6 = 0x06
	ar7 = 0x07
	ar0 = 0x00
	ar1 = 0x01

;E:/sdcode/Trials/trial.c:7: P1_2= (value==2)? 0: ~P1_0;
	mov	a,_value
	cjne	a,#0x02,00103$
;00106$:
00107$:
	mov	r2,#0x00
	sjmp	00104$
00103$:
	clr	a
	mov	c,_P1_0
	rlc	a
	cpl	a
	mov	r2,a ;<------if P1_0==1, then 
r2=0xfe, else r2=0xff;
00104$:
	mov	a,r2  
	add	a,#0xff ;<------in both cases c will 
be set..
	mov	_P1_2,c ; <-----so P1_2 will always 
be output as 1.
;E:/sdcode/Trials/trial.c:9: return;
;     genRet
00101$:
	ret
;-----------------------------------------------------
-------


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