1） For GCC, please try below method:

pragma GCC push_options

pragma GCC optimize ("O0")

your code

pragma GCC pop_options

to disable optimizations since GCC 4.4.

2） For Microsoft compiler, it also supports below grammar:

pragma optimize( "[optimization-list]", {on | off} )

3）For ARM AC5/AC6, I do a quick go through but I don't find it. Maybe I miss it.
Anyway, you can try it as what GCC does.

4) The last method is to try a unnecessary "volatile" to your function.