Arm/invert

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Write a function that returns the bitwise inversion of its parameter.

int invert (int n);

Expected solution length: Around 2 lines.

Sample Input

1

Sample Output

0xfffffffe

.global _start
_start:
    mov r0, #1
    bl invert
    1: b 1b    // Done

.global invert
invert:

Hint...

ARM has an instruction for inversion, but it is oddly named: "move inverse".

Write your solution here

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.global _start _start:

​x

 

1

.global _start

2

_start:

3

    mov r0, #1

4

    bl invert

5

    1: b 1b    // Done

6

​

7

.global invert

8

invert:

9

10

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• nios/cachehits2
• nios/memaddr
• nios/memsize
• nios/memtiling
• nios/memenable
• nios/memenable2
• arm/return
• arm/return123 ·

arm/invert

• · arm/odd
• arm/abs
• arm/add
• arm/shiftu
• arm/shifts
• arm/shiftl
• arm/bswap
• arm/popcount

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