Question

Convert the following C code to PIC24 assembly instructions:

uint16 j, k, p, q;

if ( (j < p) && (k >= p) ) {

q = q + 4;

}

else {

q = q + 8;

}

Answer 1

C program to Assembly Code Conversion

C CODE: test.c

#include<stdio.h>

#include<inttypes.h>

main()

{

uint16_t j,k,p,q;

if((j<p)&&(k>=q))

{

q=q+4;

}

else

{

q=q+8;

}

}

ASSEMBLY CODE:

  .file "test.c"

  .text

  .globl main

  .type main,@function

main:

.LFB0:

  .cfi_startproc

  pushq %rbp

  .cfi_def_cfa_offset 16

  .cfi_offset 6,-16

  movq %rsp,%rbp

  .cfi_def_cfa_register 6

  movzwl -2(%rbp), %eax

  cmpw -4(%rbp), %ax

  jnb .L2

  movzwl -6(%rbp), %eax

  cmpw -8(%rbp), %ax

  jb .L2

  addw $4, -8(%rbp)

  jmp .L4

.L2:

  addw $8,-8(%rbp)

.L4:

  popq %rbp

  .cfi_def_cfa 7, 8

  ret

  .cfi_endproc

.LFE0:

.size main, .-main

.ident "GCC: (GNU) 4.8.5 20150623 (Red Hat 4.8.5-11)"

.section .note.GNU-stack,"",@progbits