c2_4_3.asm

dsp入门与实践一书的源代码

              	.def    	start
				.data
multiplicand	.word		9000h
multiplier	.word		9000h
		.bss		result,4,0,0

				.text
start:     		MVKL	multiplicand,A11 
				MVKH	multiplicand,A11   
				MVKL	multiplier,B11
				MVKH	multiplier,B11
				LDW	*A11,A12 
				LDW	*B11,B12
				NOP	5
				MPYU	A12,B12,A11
				
				MPYHLU	A12,B12,B11
				MPYH	A12,B12,B12
				MPYLHU	A12,B12,A12
				NOP
				ADD 	B11,A12,B11
				SHR	B11,16,A12
				SHL	B11,16,B11
				ADD 	A11,B11,A11
				ADD 	A12,B12,A12
				MVKL	result,B11
				MVKH	result,B11
				STW	A11,*B11++
				STW	A12,*B11
				NOP	5
loop:           B      loop
               	NOP     5