How to understand whether your program will support non-SSE2 processors?

Question

Processors

Let's say I write a program in any language using any compiler. How can I find out if this program will work on processors without SSE2?

Answer 1

In order for the program to start using sse2, you need to either use sse2 with assembler inserts, or enable the appropriate optimization option on the compiler. Also, sse2 can be used by brought dependencies. See the documentation for the libraries and compiler you are going to use.

Answer 2

compile - disassemble - search for commands available in the SSE2 kit - you will find it - it will not work.
depends on the compiler/settings and compilation options of ready-made libraries, if you use them.