Lecture Practice Quiz 20                          

Write a C function equivlaent to the following assembly language function.

        .file   "quiz20.c"
        .text
.globl quiz20
        .type   quiz20, @function
quiz20:
        pushl   %ebp
        movl    %esp, %ebp
        subl    $16, %esp
        movl    12(%ebp), %eax
        movl    8(%ebp), %edx
        leal    (%edx,%eax), %eax
        subl    $10, %eax
        movl    %eax, -8(%ebp)
        movl    16(%ebp), %eax
        subl    $20, %eax
        movl    %eax, -4(%ebp)
        movl    -4(%ebp), %eax
        movl    -8(%ebp), %edx
        movl    %edx, %ecx
        subl    %eax, %ecx
        movl    %ecx, %eax
        leave
        ret
        .size   quiz20, .-quiz20
        .ident  "GCC: (GNU) 4.4.5 20101112 (Red Hat 4.4.5-2)"
        .section        .note.GNU-stack,"",@progbits


Answer

int quiz20(int x, int y, int z) {

   int a, b;

   a = x + y - 10;

   b = z - 20;

   return a - b;

}