LLVM Atomic instructions example

atomics.ll

store atomic i32 1, ptr %ptr, seq_cst,   align 4
store atomic i32 2, ptr %ptr, release,   align 4
store atomic i32 3, ptr %ptr, monotonic, align 4
store atomic i32 4, ptr %ptr, unordered, align 4
store        i32 5, ptr %ptr,            align 4 ;; NotAtomic
...
%r1 = load atomic i32, ptr %ptr, seq_cst,   align 4
%r2 = load atomic i32, ptr %ptr, release,   align 4
%r3 = load atomic i32, ptr %ptr, monotonic, align 4
%r4 = load atomic i32, ptr %ptr, unordered, align 4
%r5 = load        i32, ptr %ptr,            align 4 ;; NotAtomic
... 
fence acquire
fence release
fence seq_cst