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  modification, are permitted provided that the following conditions are met:

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      may be used to endorse or promote products derived from this software 
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#include "bid_internal.h"

#if DECIMAL_CALL_BY_REFERENCE
void
bid64_logb (BID_UINT64 * pres, BID_UINT64 * px
	    _EXC_FLAGS_PARAM _EXC_MASKS_PARAM _EXC_INFO_PARAM) {
  BID_UINT64 x = *px;
#else
DFP_WRAPFN_DFP(64, bid64_logb, 64)
BID_UINT64
bid64_logb (BID_UINT64 x _EXC_FLAGS_PARAM _EXC_MASKS_PARAM _EXC_INFO_PARAM) {
#endif
  int ires, exponent_x;
  BID_UINT64 sign_x, coefficient_x;
  BID_UINT64 valid_x, res;

  valid_x = unpack_BID64 (&sign_x, &exponent_x, &coefficient_x, x);

  if (!valid_x) {
    // test if x is NaN/Inf
if ((x & 0x7800000000000000ull) == 0x7800000000000000ull) {
#ifdef BID_SET_STATUS_FLAGS
  if ((x & 0x7e00000000000000ull) == 0x7e00000000000000ull)	// sNaN
    __set_status_flags (pfpsf, BID_INVALID_EXCEPTION);
#endif
	res = (coefficient_x) & QUIET_MASK64;
if ((x & 0x7c00000000000000ull) == 0x7800000000000000ull) 
    res &= 0x7fffffffffffffffull;
	BID_RETURN (res);
}
  // x is 0
#ifdef BID_SET_STATUS_FLAGS
    __set_status_flags (pfpsf, BID_ZERO_DIVIDE_EXCEPTION);
#endif
	res = 0xf800000000000000ull;
	BID_RETURN (res);
}

  BIDECIMAL_CALL1_NORND (bid64_ilogb, ires, x);
  if (ires & 0x80000000)
    res = 0xb1c0000000000000ull | (BID_UINT64)(-ires); 
  else
    res = 0x31c0000000000000ull | (BID_UINT64)ires; 
  BID_RETURN (res);
}
