2.4.4多字节有符号数除法.txt

来自「二进制浮点运算」· 文本 代码 · 共 100 行

FDIV: 
INC	R0 
MOV	A,@R0
INC	R0
ORL	A,@R0
DEC	R0
DEC	R0
JNZ	DIV1
MOV	@R0,#41H				
CLR	OV      				
RET
 
DIV1:   
INC	R1 
MOV	A,@R1 
INC	R1 
ORL	A,@R1 
DEC	R1 
DEC	R1 
JNZ	DIV2 
SETB	OV 					
RET 
DIV2: 
LCALL	MVR0 				 
MOV	A,@R0 
XRL	A,@R1 				
RLC	A 
MOV	1FH,C 				
LCALL	MVR1 				 
LCALL	DIV3 				
LJMP	MOV0 				
DIV3: 
CLR	C 					
MOV	A,R4 
SUBB	A,R7 
MOV	A,R3 
SUBB	A,R6 
JC	DIV4 
LCALL	RR1 				
SJMP	DIV3 
DIV4: 
CLR	A 					
XCH	A,R0 				
PUSH	ACC 
CLR	A 
XCH	A,R1 
PUSH	ACC 
MOV	A,R2 
PUSH	ACC 
MOV	B,#10H 				
DIV5: 
CLR	C 
MOV	A,R1 
RLC	A 
MOV	R1,A 
MOV	A,R0 
RLC	A 
MOV	R0,A 
MOV	A,R4 
RLC	A 
MOV	R4,A 
XCH	A,R3 
RLC	A 
XCH	A,R3 
MOV	F0,C 
CLR	C 
SUBB	A,R7 
MOV	R2,A 
MOV	A,R3 
SUBB	A,R6 
ANL	C,/F0 
JC	DIV6 
MOV	R3,A 
MOV	A,R2 
MOV	R4,A 
INC	R1 
DIV6: 
DJNZ	B,DIV5 
MOV	A,R6 					
CLR	C 
RRC	A 
SUBB	A,R3 
CLR	A 
ADDC	A,R1 					
MOV	R4,A 
CLR	A 
ADDC	A,R0 
MOV	R3,A 
POP	ACC 					
MOV     	R2,A 
POP      	ACC 
MOV    	 R1,A 
POP     	 ACC 
MOV     	R0,A 
MOV     	A,R2 				
CLR      	C 
SUBB     	A,R5 
LCALL    	MD 					
LJMP     	RLN