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/* 
//  Purpose:
//     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//     Unsigned internal BNU32 misc functionality
// 
//  Contents:
//     cpNLZ_BNU32()
// 
*/

#include "owncp.h"
#include "pcpbnuimpl.h"
#include "pcpbnumisc.h"
#include "pcpbnu32misc.h"

/*F*
//    Name: cpNLZ_BNU32
//
// Purpose: Returns number of leading zeros of the 32-bit BN chunk.
//
// Returns:
//       number of leading zeros of the 32-bit BN chunk
//
// Parameters:
//    x         BigNum x
//
*F*/

cpSize cpNLZ_BNU32(Ipp32u x)
{
   cpSize nlz = BITSIZE(Ipp32u);
   if(x) {
      nlz = 0;
      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++; }
   }
   return nlz;
}