LC3Pointers

YouTube Excerpt: Pointers/References in LC3 explained; Use of Instructions LEA,LD,LDR, LDI and ST, STR,STI in the context of pointers shown ; Pointers/References in LC3 ; Author: Ramesh Yerraballi ; Date: 10/25/2019 ; This code is to accompany a video ; hosted at: https://youtu.be/Ks_A2Zi5L34 ; Assume x300F holds a "thing" .ORIG x3000 LD R0,#9 ; R0 = M[x3001+9] = M[x300A] ; R0 = 42 (R0 holds a copy of thing) LEA R1,#8 ; R1 = x3002+8 = x300A ; R1 holds the address of thing OR ; R1 is a pointer/reference to thing ST R1,#12 ; R1(x300A) = M[x3003+12] = M[x300F] ; M[x300F] is a pointer/reference to thing LDR R2,R1,#0 ; R2 = M[R1+0] = M[x300A] ; R2=42; De-reference R1 to get that ; which R1 points to LDI R3,#10 ; R3 = M[M[x3005+10]] = M[M[x300F]] ; = M[x300A] = 42 ; De-reference the pointer at x300F ADD R2,R2,#1 ; R2 = 43 STR R2,R1,#0 ; De-reference R1 for writing ; M[R1+0] = M[x300A] gets 43 STI R0, #7 ; De-reference Memory Location for writing ; M[M[x3008+7]] = 42; Set thing back to 42 TRAP x21 ; Print char in R0 to Console (OUT) TRAP x25 ; HALT .FILL #42 ; "thing" is 42 at location x300A .END .ORIG x300F .BLKW #1 ; A pointer/reference to thing will go here .END

Pointers/References in LC3 explained; Use of Instructions LEA,LD,LDR, LDI and ST, STR,STI in the context of pointers shown ; Pointers/References in...

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