; FILE "fpu1.c"
        SECTION .text
GLOBAL foo

foo: 
        push    ebp                 ; set up stack frame
        mov     ebp,esp
        sub     esp,80

        fld     qword [ebp-64]      ; push x3 on FPU stack
        fadd    qword [ebp-56]      ; add x4 to top of FPU stack
        fadd    qword [ebp-72]      ; add x2 to top of FPU stack
        fadd    qword [ebp-80]      ; add x1 to top of FPU stack
        fstp    qword [ebp-8]       ; store result in y

        leave                       ; take down stack frame
        ret