; Recitation 6 ; Author: ; Date: ; Email: ; Class: CS270 ; ; Description: Implements integer (16-bit) addition and subtraction ; ;------------------------------------------------------------------------------ ; Begin reserved section: do not change ANYTHING in reserved section! .ORIG x3000 BR Main ; A jump table defined as an array of addresses Functions .FILL IntAdd ; address of add routine (option 0) .FILL IntSub ; address of subtract routine (option 1) .FILL IntMul ; address of multiply routine (option 2) Main LEA R0,Functions ; get base of jump table LD R1,Option ; get option to use, no error checking ADD R0,R0,R1 ; add index of array LDR R0,R0,0 ; get address of function JSRR R0 ; call selected function HALT ; Parameters and return values for all functions Option .BLKW 1 ; which function to call Param1 .BLKW 1 ; space to specify first parameter Param2 .BLKW 1 ; space to specify second parameter Result .BLKW 1 ; space to store result ; End reserved section: do not change ANYTHING in reserved section! ;------------------------------------------------------------------------------ IntAdd ; Your code goes here ; Solution has ~4 instructions RET ;------------------------------------------------------------------------------ IntSub ; Your code goes here ; Solution has ~6 instructions RET ;------------------------------------------------------------------------------ IntMul ; Your code goes here ; Solution has ~9 instructions RET ;------------------------------------------------------------------------------ .END