Uses ROUNDSS which is only available from SSE4.1
@lokobeta1 reported in #22 (closed) that Loko doesn't work on his old laptop that doesn't have SSE4.1:
The condition has 5 components:
1. &error &serious
2. &who
who: flinteger?
3. &message
message: "The program has used an unsupported CPU instruction"
4. &irritants
irritants: ((roundss xmm1 xmm1 3))
5. &program-counter
program-counter: 2236221
End of condition components.
Let's find some SSE2 instructions for rounding. (IIRC they were less convenient to use than ROUNDSS).