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Rev 3425 Rev 4377
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        "nop\n"
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        "nop\n"
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    "1:\n"
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    "1:\n"
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        "ldx %0, %2\n"
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        "ldx %0, %2\n"
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        "brz %2, 0b\n"
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        "brz %2, 0b\n"
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        "nop\n"
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        "nop\n"
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        "ba 1b\n"
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        "ba %xcc, 1b\n"
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        "nop\n"
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        "nop\n"
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    "2:\n"
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    "2:\n"
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        : "+m" (*((uint64_t *) x)), "+r" (tmp1), "+r" (tmp2) : "r" (0)
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        : "+m" (*((uint64_t *) x)), "+r" (tmp1), "+r" (tmp2) : "r" (0)
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    );
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    );
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