How to ensure compiler reordering instructions

[timber meadow]

Dear guys I'm working on a C program with atomic reads and writes with multilple threads. However the compiler doesn't reorder instructions even with relaxed memory order. In what kinda cases does the compiler reorder instructions and how should I compile my instructions so that these optimisations take place

    atomic_store_explicit(&x, 1, memory_order_relaxed);
    atomic_store_explicit(&x, 2, memory_order_relaxed);
    // atomic_thread_fence(memory_order_seq_cst);
    printf("Thread A reads: %d\n", atomic_load_explicit(&y, memory_order_relaxed));

[dark willow]

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[azure copper]

You probably have the x86[-64] memory model, no?

Does this help?

[timber meadow]

I have a x86 arch yes but im trying to create a program wich reports if there have been sc violations while executing

[azure copper]

wdym by "sc violations"?

[timber meadow]

sequential consistency violations

so basically po U mo U rf U fr cyclcity