Extract and Modify Field in a 32-bit Register

Code

#include <stdio.h>
#include <stdint.h>

uint32_t update_register(uint32_t reg) {
    // Get the field
    uint32_t field = (reg >> 10) & 0x1f;

    // Add 1
    if (((~field) & 0x1f) != 0) {
        // Maybe later I'll come back and do a bitwise full adder
        field++;
    }

    // Write back to register
    reg &= ~((0b11111) << 10);
    reg |= field << 10;

    return reg;
}

int main() {
    uint32_t reg;
    scanf("%u", &reg);
    uint32_t updated = update_register(reg);
    printf("%u", updated);
    return 0;
}

Solving Approach

 

 

 

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Input

15360

Expected Output

16384