[LLVMdev] Is it correct to access non-atomic variables using atomic operations?

[Lei Zhao]

Hi Everyone,

  This might be more a C/C++11 question than a LLVM question: I wondering if it is semantically correct to access an ordinary variable via atomic operations, like:

int val;
void foo(){ atomic_store((atomic_int *)(&val), 42); }

  I tried this simple program on clang+llvm and 42 seems to be correctly stored to val. But, is this just by luck or a right way to go? 

Thanks.

- Lei