Question

For this ARM assembly code: AREA Prog, CODE, READONLY ENTRY COUNT EQU 128 func MOV R1, #0 loop CMP R1, #COUNT BGE exit LDR R2, [R3, R1, LSL #2]; ADD RO, RO, R2; ADD R1, R1, #2 B loop MOV PC, LR (a) How many bytes of memory does this program occupy? [2 marks] (b) Data processing instructions take one clock cycle and control flow and memory access instructions take 3 clock cycles. If the above code is running on a system clocked at 100 MHz frequency, what is the time taken in seconds to run the above code? [5 marks] (c) Optimise and re-write the above assembly program so that only one branch instruction is used. [6 marks] (d) For your optimised code in (c), what is the code size and execution time? [6 marks]

          For this ARM assembly code:
AREA	Prog, CODE, READONLY
ENTRY
COUNT	EQU 128
func
MOV	R1, #0
loop
CMP	R1, #COUNT
BGE	exit
LDR	R2, [R3, R1, LSL #2];
ADD	RO, RO, R2;
ADD	R1, R1, #2
B	loop
MOV	PC, LR
(a) How many bytes of memory does this program occupy? [2 marks]
(b) Data processing instructions take one clock cycle and control flow and memory access instructions take 3 clock cycles. If the above code is running on a system clocked at 100 MHz frequency, what is the time taken in seconds to run the above code? [5 marks]
(c) Optimise and re-write the above assembly program so that only one branch instruction is used. [6 marks]
(d) For your optimised code in (c), what is the code size and execution time? [6 marks]

For this ARM assembly code:
AREA Prog, CODE, READONLY
ENTRY
COUNT EQU 128
func
MOV R1, #0
loop
CMP R1, #COUNT
BGE exit
LDR R2, [R3, R1, LSL #2];
ADD RO, RO, R2;
ADD R1, R1, #2
B loop
MOV PC, LR
(a) How many bytes of memory does this program occupy? [2 marks]
(b) Data processing instructions take one clock cycle and control flow and memory access instructions take 3 clock cycles. If the above code is running on a system clocked at 100 MHz frequency, what is the time taken in seconds to run the above code? [5 marks]
(c) Optimise and re-write the above assembly program so that only one branch instruction is used. [6 marks]
(d) For your optimised code in (c), what is the code size and execution time? [6 marks]

Added by Gregory P.

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