X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=doc%2Frandom-notes.txt;h=fc8f443d24aed5f59b21b5074f917aab48801a4f;hb=615000d5b61a78df5d530c3eda32753ce5503c1e;hp=3df388cf43b8344dcd41cca54c28ec7dd750fd22;hpb=bb757430d461522091e8a41477a0c961a0072e41;p=fw%2Fsdcc

diff --git a/doc/random-notes.txt b/doc/random-notes.txt
index 3df388cf..fc8f443d 100644
--- a/doc/random-notes.txt
+++ b/doc/random-notes.txt
@@ -208,3 +208,175 @@ which is more like:
 First looking in SDCCicode.c for the stuff that generates function calls:
 Probably a bug in geniCodeParams.
 Nope, a bug in my stuff :)
+
+Michael
+-------
+Comparing the dhrystone code vs Hitech C v7.50
+
+cp:
+	ld	hl,__r
+	ld	(_Next_Ptr_Glob),hl
+vs:
+	ld	hl,#__r
+	ld	iy,#_Next_Ptr_Glob
+	ld	0(iy),l
+	ld	1(iy),h
+
+cp:
+	ld	a,#<__r
+	add	a,#0x27
+	ld	iy,#_Ptr_Glob
+	ld	0(iy),a
+	ld	a,#>__r
+	adc	a,#0x00
+	ld	1(iy),a
+vs:
+	ld	hl,__r+027h
+	ld	(_Ptr_Glob),hl
+
+cp:
+	ld	iy,#_Next_Ptr_Glob
+	ld	a,0(iy)
+	ld	(hl),a
+	inc	hl
+	ld	a,1(iy)
+	ld	(hl),a
+
+vs:
+	ld	bc,(_Next_Ptr_Glob)
+	ld	hl,(_Ptr_Glob)
+	ld	(hl),c
+	inc	hl
+	ld	(hl),b
+
+
+cp:
+	ld	bc,(_Ptr_Glob)
+	ld	l,c
+	ld	h,b
+	inc	hl
+	inc	hl
+	ld	(hl),#0x00
+	inc	hl
+	ld	(hl),#0x00
+vs:
+	ld	iy,(_Ptr_Glob)
+	ld	(iy+2),0
+	ld	(iy+3),0
+
+
+strcpy is inlined as:
+u12:
+	ld	a,(hl)
+	ldi
+	or	a
+	jp	nz,u12
+
+cp:
+	ld	a,#<_Arr_2_Glob
+	add	a,#0x2E
+	ld	-80(ix),a
+	ld	a,#>_Arr_2_Glob
+	adc	a,#0x03
+	ld	-79(ix),a
+;	genAssign (pointer)
+;	AOP_STK for _main_sloc1_1_0
+	ld	l,-80(ix)
+	ld	h,-79(ix)
+	ld	(hl),#0x0A
+	inc	hl
+	ld	(hl),#0x00
+vs:
+	ld	hl,0Ah
+	ld	(_Arr_2_Glob+032Eh),hl
+
+cp:
+	ld	a,-72(ix)
+	or	a,a
+	jp	nz,00126$
+	ld	a,-71(ix)
+	and	a,#0x03
+; Rule 4: Changed jp order
+	jp	z,00127$
+00126$:
+	jp	00102$
+00127$:
+
+vs:        
+	ld	(ix+-7),c
+	ld	(ix+-6),b
+	ld	a,c
+	ld	l,a
+	ld	a,b
+	and	03h
+	ld	h,a
+	ld	a,l
+	or	h
+	jp	nz,l12
+
+cp:
+	ld	a,-82(ix)
+	or	a,-81(ix)
+	sub	a,#0x01
+	ld	a,#0x00
+	rla
+	ld	iy,#_Bool_Glob
+	ld	0(iy),a
+	ld	1(iy),#0x00
+
+vs:
+	ld	a,l
+	or	h
+	ld	hl,01h
+	jp	z,u42
+	dec	hl
+u42:
+	ld	(_Bool_Glob),hl
+
+;C:\TEMP\DHRY.C: 173: Int_3_Loc = 5 * Int_1_Loc - Int_2_Loc;
+is turned into:
+	ld	l,(ix+-13)
+	ld	h,(ix+-12)
+	ld	d,h
+	ld	e,l
+	add	hl,hl
+	add	hl,hl
+	add	hl,de
+   
+Comapring two types of cmpeq:
+	ld	a,c		; 4
+	cp	a,#0xFB         ; 7
+	jp	nz,00119$	; 10
+	ld	a,b		; 4
+	cp	a,#0xFF		; 7
+; Rule 5: Changed jump logic
+	jp	z,00101$	; 10
+00119$:
+        ; 21 to 42
+
+vs:
+        ld      hl,#val		; 10
+        or      a		; 4
+        sbc     hl,bc		; 15 
+        jp      z,...		; 10
+        ; Always 39 - worse
+
+Comaring break even point for shift:
+	ld	a,#0x03+1	; 7
+	jp	00114$		; 10
+00113$:
+	sra	b		; 8
+	rr	c		; 8
+00114$:
+	dec	a		; 4
+	jp	nz,00113$	; 10
+
+        ; Bytes: 2+3+1+1+1+3 = 11
+        ; t-states = 17+n*30
+vs
+        sra     b
+        rr      c ...
+        ; Bytes: 2*n
+        ; t-states = 16*n         
+
+        Ah, pick 4
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