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efriedma added a comment.
So gcc has two different behaviors on ARM:
- On linux, prefers `__sync` calls, and generates inline code for load/store.
- On baremetal, gcc chooses what sort of atomic call to generate based on how
the source code is written: if the user writes `__sync`, you get `__syn
john.brawn added a comment.
Looking at GCC it looks like there (for cortex-m0 at least) the behaviour is
that loads and stores are generated inline, but more complex operations go to
the atomic library calls (not the sync library calls). e.g. for
int x, y;
int fn() {
return __atomic_loa
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