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

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


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

cpSize cpNLZ_BNU(BNU_CHUNK_T x)
{
   cpSize nlz = BNU_CHUNK_BITS;
   if(x) {
      nlz = 0;
      #if (BNU_CHUNK_BITS == BNU_CHUNK_64BIT)
      if( 0==(x & 0xFFFFFFFF00000000) ) { nlz +=32; x<<=32; }
      if( 0==(x & 0xFFFF000000000000) ) { nlz +=16; x<<=16; }
      if( 0==(x & 0xFF00000000000000) ) { nlz += 8; x<<= 8; }
      if( 0==(x & 0xF000000000000000) ) { nlz += 4; x<<= 4; }
      if( 0==(x & 0xC000000000000000) ) { nlz += 2; x<<= 2; }
      if( 0==(x & 0x8000000000000000) ) { nlz++; }
      #else
      if( 0==(x & 0xFFFF0000) ) { nlz +=16; x<<=16; }
      if( 0==(x & 0xFF000000) ) { nlz += 8; x<<= 8; }
      if( 0==(x & 0xF0000000) ) { nlz += 4; x<<= 4; }
      if( 0==(x & 0xC0000000) ) { nlz += 2; x<<= 2; }
      if( 0==(x & 0x80000000) ) { nlz++; }
      #endif
   }
   return nlz;
}