Bug #20633 ยป patch-vm_insnhelper.c.diff
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This is a no-op in all cases we've looked at (https://godbolt.org/z/3oxd1446K), but should guarantee it for all
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future/untested compilers/platforms. */
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#ifdef HAVE_DECL_ATOMIC_SIGNAL_FENCE
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#if defined HAVE_DECL_ATOMIC_SIGNAL_FENCE && HAVE_DECL_ATOMIC_SIGNAL_FENCE
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atomic_signal_fence(memory_order_seq_cst);
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#endif
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