Re: [Sdcc-user] SDCC Z80 wrong assembly code

[Philipp K. K. <pk...@sp...>]

Hynek Sladky schrieb:
> I have function for caseless compare:
> int strnicmp (const char *s1, const char *s2, int maxlen) {
> [...]
> ;	genIfx
> 	ld	a,e		;overwriting A!!!
> 	or	a,d
> 	jr	Z,00114$
> ;	genIfx
> 	xor	a,a
> 	or	a,c
> 	jr	Z,00114$
> ;	genIfx
> 	xor	a,a
> 	or	a,b
> 	jr	Z,00114$
> ;	genIfx
> 	or	a,a		;seems wants to use A???
> 	jp	NZ,00112$
> 
> It seems that it wants to use previously computed result stored in A but 
> later this is overwritten. What to do to get correctly compiled program?
> 
> Thanks
> Hynek Sladky

I just tried with sdcc 2.8.9 #5392. I compiled your function using sdcc
-mz80 test.c. I could not reproduce the bug. I get the following code:

;test.c:10: } while (maxlen && c1 && c2 && c1==c2);
	ld	a,e
	or	a,d
	jr	Z,00114$
	xor	a,a
	or	a,c
	jr	Z,00114$
	xor	a,a
	or	a,b
	jr	Z,00114$
	xor	a,a
	or	a,-5 (ix)
	jp	NZ,00112$
00114$:

Philipp