.syntax unified
.cpu cortex-m4
.thumb

.global lab1_v1

#define A 0xED76
#define B 0xFA53
#define C 10

lab1_v1:
    push.n {r0, r1, r2}

    ldr.n r0, =A
    ldr.n r1, =B

    and r0, r1

    mov r1, #C
    mov r2, 1

    _fac:
    mul r2, r2, r1
    sub r1, #1
    cmp.n r1, #1
    bgt _fac

    add r2, r2, r0, lsr #1
    mov r11, r2

    pop {r0, r1, r2}

    mov pc, lr