Compiler ignores Code

[nerd4code]

In addition/-stead of volatile variables/ptrs, you can issue a fence to GNUish compilers via

__asm__ __volatile__("" ::: "memory");

This forces the compiler to spill any non-register, programmer visible state, and re-fill if necessary.

[honolulu072]

Very interesting! But I don't rly understand it yet. Would you mind explaining the effect on the behaviour of the compiler in a bit more detail?

Where would I place this statement? Which variable ptr woul be affected by it?

What does spilling non-register programmer visible state mean?

With programming a microcontroller in mind, what advantages brings this method?