ext/ipp/sources/ippcp/pcpbnu_arith_sub.c

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/* 
//  Purpose:
//     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
//     Internal Unsigned arithmetic
// 
//  Contents:
//     cpSub_BNU()
// 
*/

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


/*F*
//    Name: cpSub_BNU
//
// Purpose: Subtraction of two BigNums.
//
// Returns:
//    borrow of result of sub two BigNums.
//
// Parameters:
//    pA    source BigNum A
//    pB    source BigNum B
//    pR    resultant BigNum
//    ns    size of BigNums
*F*/
#if defined(_USE_C_cpSub_BNU_)
#pragma message ("C version of cpSub_BNU: ON")
#else
#pragma message ("C version of cpSub_BNU: OFF")
#endif

#if !((_IPP==_IPP_W7) || \
      (_IPP==_IPP_T7) || \
      (_IPP==_IPP_V8) || \
      (_IPP==_IPP_P8) || \
      (_IPP>=_IPP_G9) || \
      (_IPP==_IPP_S8) || \
      (_IPP32E==_IPP32E_M7) || \
      (_IPP32E==_IPP32E_U8) || \
      (_IPP32E==_IPP32E_Y8) || \
      (_IPP32E>=_IPP32E_E9) || \
      (_IPP32E==_IPP32E_N8)) || \
      defined(_USE_C_cpSub_BNU_)
BNU_CHUNK_T cpSub_BNU(BNU_CHUNK_T* pR, const BNU_CHUNK_T* pA, const BNU_CHUNK_T* pB, cpSize ns)
{
   BNU_CHUNK_T borrow = 0;
   cpSize i;
   for(i=0; i<ns; i++) {
      SUB_ABC(borrow, pR[i], pA[i], pB[i], borrow);
   }
   return borrow;
}
#endif