[sdcc-devel] More on pointers

[Michael H. <mic...@ea...>]

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It's messier than I thought :)  The first optimisation seems to be pointer
fetch/inc dependent.  This code:

Is:						Should be:
- ----------------------------------------	--------------------
; genAssign
	ld	-4(ix),e	; tmp = d	-4(ix) = de
	ld	-3(ix),d
; genPlus
; genPlusIncr
	ld	c,e				inc de
	ld	b,d				(ie really bad !)
	inc	bc		
; genAssign
	ld	e,c
	ld	d,b
; genAssign
	ld	l,-2(ix) ; 0			hl = -2(ix)
	ld	h,-1(ix) ; 1
; genPlus
; genPlusIncr
	ld	c,-2(ix) ; 0			inc -2(ix)
	ld	b,-1(ix) ; 1			jr
	inc	bc				inc -1(ix)
; genAssign
	ld	-2(ix),c
	ld	-1(ix),b
; genPointerGet
	ld	a,(hl)				a = (hl)
	ld	c,a
; genAssign (pointer)
	ld	l,-4(ix) ; 0			hl = -4(ix)
	ld	h,-3(ix) ; 1
	ld	(hl),c				ld (hl),a
; genGoto
	jp	00101$				jp

is generated from part of a standard memcpy:
	*d++ = *s++

- -- Michael

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