[sdcc-devel] [ sdcc-Bugs-1430967 ] bad pic14 code for address of parameter

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Bugs item #1430967, was opened at 2006-02-13 21:44
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Borut Razem (borutr)
Assigned to: Nobody/Anonymous (nobody)
Summary: bad pic14 code for address of parameter

Initial Comment:
1 - code sample:
-------------------------------
void
f2(int *p1)
{
  int t = *p1;
}

void
f1(int p1)
{
  f2(&p1); // <== bad asm code for address of parameter
}

void
main (void)
{
  f1 (0x1234);
}
-------------------------------
Already included in src\regression\ptrarg.c pic14
regression test

2 - sdcc command:
$ sdcc -mpic14 -pp16f877 t.c

3 - sdcc version:
$ sdcc --version
SDCC :
mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08
2.5.4 #1205 (Feb 13 2006) (MINGW32)

4 - no error message, bad code generated for f1():
_f1	;Function start
	MOVF	STK00,W
	BANKSEL	r0x25
	MOVWF	r0x25
	MOVWF	STK01
	MOVF	r0x25,W
	MOVWF	STK00
	MOVLW	0x00
	CALL	_f2
	RETURN	
; exit point of _f1

The bigest problem is that the lo byte of the parameter
is passed in STK00 and high byte in W register, so how
can we get the address of parameter?!  :-(

Borut


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