kit

kit
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builtin_26_sync_synchronize.c (416B)

      1 /* __sync_synchronize() is the legacy GCC full (sequentially-consistent) memory
      2  * barrier: no operands, no result. SQLite uses it for sqlite3MemoryBarrier().
      3  * Single-threaded it has no observable effect, so we just confirm it parses,
      4  * lowers to a fence, and the surrounding arithmetic still runs. */
      5 int test_main(void) {
      6   int x = 21;
      7   __sync_synchronize();
      8   x = x * 2;
      9   __sync_synchronize();
     10   return x;
     11 }