// issue-0013: += on global variables reads initial value instead of current value
//
// `g_counter += 1` compiles as `store(initial_value + 1)` instead of
// `store(load(g_counter) + 1)`. So it always produces the same result.
//
// Workaround: use `g_counter = g_counter + 1` instead of `g_counter += 1`

#import "modules/std.sx";

g_counter : s64 = 0;

tick :: () {
    g_counter += 1;
    print("counter={}\n", g_counter);
}

main :: () -> void {
    // Test 1: += always produces 1 (BUG)
    out("--- Test 1: += (broken) ---\n");
    out("Expected: 1, 2, 3\n");
    i : s64 = 0;
    while i < 3 {
        tick();
        i += 1;
    }

    // Test 2: manual read-modify-write works correctly
    out("--- Test 2: = x + 1 (works) ---\n");
    out("Expected: 2, 3, 4\n");
    g_counter = g_counter + 1;
    print("counter={}\n", g_counter);
    g_counter = g_counter + 1;
    print("counter={}\n", g_counter);
    g_counter = g_counter + 1;
    print("counter={}\n", g_counter);
}