Arm/add64

Write a function that returns the sum of its two parameters. The parameters and return values are both 64-bit integers. 64-bit operands are passed in two consecutive registers. Thus, the first parameter is in r0 and r1, while the second parameter is in r2 and r3, with the return value returned in r0 and r1.

long long add64 (long long a, long long b);

Expected solution length: Around 3 lines.

Sample Input

(1, 1)

Sample Output

.global _start
_start:
    mov r0, #1  // Lower 32 bits of a
    mov r1, #0  // Upper 32 bits of a
    mov r2, #1  // Lower 32 bits of b
    mov r3, #0  // Upper 32-bits of b
    bl add64
    1: b 1b    // Done

.global add64
add64:

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arm/add64

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Arm/add64

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Sample Output

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