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        "0:\n"
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        "0:\n"
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        "ldx %0, %1\n"
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        "ldx %0, %1\n"
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        "add %1, %3, %2\n"
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        "add %1, %3, %2\n"
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        "casx %0, %1, %2\n"
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        "casx %0, %1, %2\n"
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        "cmp %1, %2\n"
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        "cmp %1, %2\n"
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        "bne 0b\n"
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        "bne 0b\n"      /* The operation failed and must be attempted again if a != b. */
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        "nop\n"
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        "nop\n"
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        : "=m" (*((__u64 *)x)), "=r" (a), "=r" (b)
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        : "=m" (*((__u64 *)x)), "=r" (a), "=r" (b)
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        : "r" (i)
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        : "r" (i)
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    );
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    );
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