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#define MB2SIZE(mb)  ((mb) << 20)
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#define MB2SIZE(mb)  ((mb) << 20)
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#define STRING(arg)      STRING_ARG(arg)
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#define STRING(arg)      STRING_ARG(arg)
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#define STRING_ARG(arg)  #arg
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#define STRING_ARG(arg)  #arg
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#define LOWER32(arg)  ((arg) & 0xffffffff)
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#define UPPER32(arg)  (((arg) >> 32) & 0xffffffff)
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#define MERGE_LOUP32(lo, up) \
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    ((((uint64_t) (lo)) & 0xffffffff) \
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        | ((((uint64_t) (up)) & 0xffffffff) << 32))
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/** Pseudorandom generator
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/** Pseudorandom generator
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 *
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 *
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 * A pretty standard linear congruential pseudorandom
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 * A pretty standard linear congruential pseudorandom
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 * number generator (m = 2^32 or 2^64 depending on architecture).
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 * number generator (m = 2^32 or 2^64 depending on architecture).
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 *
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 *