[sdcc-devel] [ sdcc-Bugs-1440527 ] bad pic16 code generated for constant pointer

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Bugs item #1440527, was opened at 2006-02-28 19:54
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Category: pic16 target
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Borut Razem (borutr)
Assigned to: Nobody/Anonymous (nobody)
Summary: bad pic16 code generated for constant pointer

Initial Comment:
1 - sample code:
-------------------------------------
void 
func(unsigned char a)
{
  a;
}

void
main(void)
{
  unsigned char c=*((unsigned char*)(0xa000));

  func(c); 
}
-------------------------------------

2 - sdcc command:
sdcc -mpic16 -S t.c

3 - sdcc version:
>sdcc -v
SDCC :
mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08
2.5.4 #1212 (Feb 19 2006) (MINGW32)

4 - bad code generated:
-------------------------------------
S_t2__main	code
_main:
;	.line	8; t2.c	main(void)
	MOVFF	r0x00, POSTDEC1
;	.line	11; t2.c	unsigned char c=*((unsigned
char*)(0xa000));
	MOVFF	x«l, FSR0L     <== bad code
	MOVFF	8¬l, PRODL     <== bad code
	MOVF	0x00, W
	CALL	__gptrget1
	MOVWF	r0x00
;	.line	13; t2.c	func(c); 
	MOVF	r0x00, W
	MOVWF	POSTDEC1
	CALL	_func
	INCF	FSR1L, F
	MOVFF	PREINC1, r0x00
	RETURN
-------------------------------------

This is actually a minimized version of the regression
test bug-460010.c

Borut


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