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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projects / fw / sdcc / blobdiff