.global checkSW
.type checkSW, @function
checkSW:
pushl %ebp
movl %esp, %ebp
pushl %ebx

fnstsw %ax
xor %ebx, %ebx

movl $17 , %ecx
decl %ecx
testBits:
rol $1, %ax
setc %bl
cmp $1, %bl
je storeResult
loop testBits
movl $-1, %eax

finish:
popl %ebx
leave
ret

storeResult:
movl %ecx, %eax
decl %eax
jmp finish