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1906 serge 1 
/*
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 * Written by J.T. Conklin .
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 * Changes for long double by Ulrich Drepper
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 * Public domain.
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 */
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#include
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double
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logb (double x)
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{
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  double res;
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  asm ("fxtract\n\t"
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       "fstp	%%st" : "=t" (res) : "0" (x));
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  return res;
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}