April 2006 Saeid Nooshabadi

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April 2006 Saeid Nooshabadi saeid@unsw.edu.au ELEC2041 Microprocessors and Interfacing Lectures 17: Functions in C/ Assembly - III - Extra http://webct.edtec.unsw.edu.au/ April 2006 Saeid Nooshabadi saeid@unsw.edu.au

Factorial in ARM and C fact: stmfd sp!, {v1,lr} sub fp, ip, #4 body: mov v1, a1 ; copy of n for mul cmp v1, #1 ; n==1 sub a1, a1, #1 ; n -1 for fact(n-1) mov a2, v1 ; return value if n=1 beq fin ; return bl fact ; recursion with n-1 mul a2, a1, v1 ; n*fact(n-1) fin: mov a1, a2 ; return 1 or n*fact(n-1) ldmfd sp!, {v1,pc} unsigned int fact(unsigned int n) {if (n == 1)return 1; else return n*fact(n-1); }

Stack Growth and Shrinkage (#1/2) sp fact(3) sp lr v1 fact(2) sp v1 lr fact(1) sp v1 lr unsigned int fact(unsigned int n) {if (n == 1)return 1; else return n*fact(n-1); }

Stack Growth and Shrinkage (#2/2) sp 6 fact(3) sp lr v1 2 fact(2) sp v1 lr 1 fact(1) sp v1 lr unsigned int fact(unsigned int n) {if (n == 1)return 1; else return n*fact(n-1); }