lab4a.asm

几个TMS320C54xx的程序

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*  lab4a.asm      y= a1*x1+a2*x2+a3*x3+a4*x4   *
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        .title   "lab4a.asm"
	.mmregs
STACK   .usect   "STACK",10h      ;allocate space for stack
        .bss     x,5              ;allocate 9 word for variates
        .bss     a,5                              
        .bss     y,1
        .def     start
        .data                                     
table:  .word    1*32768/10,2*32768/10,3*32768/10,4*32768/10,5*32768/10
        .word    1*32768/10,2*32768/10,3*32768/10,4*32768/10,5*32768/10
        .text                     ;code follows ...
start:  STM      #STACK+10h,SP    ;set stack pointer 
        STM      #table,AR1       ;AR1 point to table
        STM      #x,AR2           ;AR2 point to x
        STM      #9,AR0
        LD       #0,A
	STM	#0,SWWSR
loop:   LD       *AR1+,A          ;move 10 values
        STL      A,*AR2+          ;from data memory
        BANZ     loop,*AR0-       ;into data memory
        SSBX     FRCT
        CALL     SUM              ;call SUM subrotine
end:    B        end
SUM:    STM      #a,AR3           ;The subrotine lmplememt
        STM      #x,AR4           ;multiply--accumulate
        RPTZ     A,#4
        MAC      *AR3+,*AR4+,A
        STH      A,@y
        RET
       .end