test4.s

THIS DESIGNE PROGRAM.

X		EQU		9
n		EQU		8

;--------------------------------------		

		AREA	Example4,CODE,READONLY
		ENTRY
		CODE32
		
;--------------------------------------

START	LDR		SP,=0x40003f00
		LDR		R0,=X
		LDR		R1,=n
		LDR		R2,=0X33333333
		LDR		R3,=0X44444444
		LDR		R4,=0X55555555
		LDR		R5,=0X66666666
		LDR		R12,=0X12121212
		BL		POW
		
;--------------------------------------

HALT	B		HALT

;--------------------------------------

POW		STMFD	SP!,{R1-R12,LR}
		MOVS	R2,R1
		
		MOVEQ	R0,#1
		BEQ		POW_END
		
		CMP		R2,#1
		BEQ		POW_END
		
		MOV		R1,R0
		SUB		R2,R2,#1
POW_L1	BL		DO_MUL
		SUBS	R2,R2,#1
		BNE		POW_L1		
		
POW_END	LDMFD	SP!,{R1-R12,PC}

;--------------------------------------

DO_MUL	MUL		R0,R1,R0
		MOV		PC,LR
		
;--------------------------------------

		END