[sdcc-devel] [ sdcc-Bugs-466029 ] Incorrect code for comparison

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

Bugs item #466029, was opened at 2001-09-28 05:52
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=100599&aid=466029&group_id=599

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Marc Nijweide (nijweide)
Assigned to: Nobody/Anonymous (nobody)
Summary: Incorrect code for comparison

Initial Comment:
The following code:
extern void f( unsigned char x );

int main( unsigned char* a )
{
   unsigned char *p = a + 4;
   unsigned char c;

   while ((p>a) && (*p))
   {
      --p;
      c = *p - '0';
      if (c>9)                   //INCORRECT CODE
         f(c);
   }
}

generates incorrect code for the comparison:
;	test2.c 11              // c = *p - '0'
;	genPointerGet
	ld	a,(bc)
;	genMinus
	ld	e,a
	add	a,#0xD0
	ld	e,a
;	test2.c 12             // if (c>9)
;	genCmpGt
	ld	a,#0x09
	sbc	a,e            // <<== should be SUB
	jp	nc,00104$

Tested with RC2 and september 27 snapshot, both fail.
Compiler flags -mz80 -c.



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