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/* 
//  Purpose:
//     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//     Internal Unsigned BNU misc functionality
// 
//  Contents:
//     cpNTZ_BNU()
// 
*/

#include "owncp.h"
#include "pcpbnumisc.h"


/*F*
//    Name: cpNTZ_BNU
//
// Purpose: Returns number of trailing zeros of the BNU.
//
// Returns:
//       number of trailing zeros of the BNU
//
// Parameters:
//    x         BigNum x
//
*F*/

cpSize cpNTZ_BNU(BNU_CHUNK_T x)
{
   cpSize ntz = BNU_CHUNK_BITS;
   if(x) {
      ntz = 0;
      #if (BNU_CHUNK_BITS==BNU_CHUNK_64BIT)
      if( 0==(x & 0x00000000FFFFFFFF) ) { ntz+=32; x>>=32; }
      if( 0==(x & 0x000000000000FFFF) ) { ntz+=16; x>>=16; }
      if( 0==(x & 0x00000000000000FF) ) { ntz+= 8; x>>= 8; }
      if( 0==(x & 0x000000000000000F) ) { ntz+= 4; x>>= 4; }
      if( 0==(x & 0x0000000000000003) ) { ntz+= 2; x>>= 2; }
      if( 0==(x & 0x0000000000000001) ) { ntz++; }
      #else
      if( 0==(x & 0x0000FFFF) )         { ntz+=16; x>>=16; }
      if( 0==(x & 0x000000FF) )         { ntz+= 8; x>>= 8; }
      if( 0==(x & 0x0000000F) )         { ntz+= 4; x>>= 4; }
      if( 0==(x & 0x00000003) )         { ntz+= 2; x>>= 2; }
      if( 0==(x & 0x00000001) )         { ntz++; }
      #endif
   }
   return ntz;
}