.L5:                            /** loop body **/
    movl    -12(%ebp), %eax     /* *rand_stream                 */
    movl    %eax, (%esp)        /*                  -> stack[0] */
    call    fgetc               /* call fgetc with 1 arg from stack */
    movl    %eax, -20(%ebp)     /* x                -> -20(%ebp) */
    cmpl    $126, -20(%ebp)     /* cmp(126,x)       -> %eax */ 
    jg      .L3                 /* if (cmp) goto assign 1 */

                                /** x is <127  => assign -1 **/
    movl    $-1, -36(%ebp)      /* -1               -> -36(%ebp) */

    jmp     .L4                 /* goto pos += ... */

.L3:                            /** x is >=127 => assign 1 **/
    movl    $1, -36(%ebp)       /* 1                -> -36(%ebp) */

.L4:                            /** pos += ... **/
    movl    -36(%ebp), %eax     /* add(1 or -1,              */
    addl    %eax, -4(%ebp)      /*              pos) -> pos  */
    addl    $1, -16(%ebp)       /* add(1, i)         -> i */