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#include "bid_trans.h"

BID_TYPE0_FUNCTION_ARGTYPE1(BID_UINT64, bid64_tanh, BID_UINT64, x)

// Declare local variables

  BID_UINT64 res;
  BID_F80_TYPE xd, yd;

// Check for NaN and just return the same NaN, quieted and canonized

  if ((x & NAN_MASK64) == NAN_MASK64)
   {
     #ifdef BID_SET_STATUS_FLAGS
     if ((x & SNAN_MASK64) == SNAN_MASK64)
        __set_status_flags (pfpsf, BID_INVALID_EXCEPTION);
     #endif
     res = x & 0xfc03ffffffffffffull;
     if ((res & 0x0003ffffffffffffull) > 999999999999999ull)
        res &= ~0x0003ffffffffffffull;
     BID_RETURN(res);
   }

// Otherwise just do the operation "naively".
// We inherit the tanh([-]inf) = [-]1 case from the binary function
// rather than having a special case for it.

  BIDECIMAL_CALL1(bid64_to_binary80,xd,x);
  __bid_f80_tanh( yd, xd );
  BIDECIMAL_CALL1(binary80_to_bid64,res,yd);
  BID_RETURN (res);
}
