kc3-lang/libtommath/mp_copy.c

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• Hash : bcda8fc6
  Author :
  Date : 2019-10-29T22:38:49
  

  simplifications: remove unnecessary optimization * these double checks are not necessary * the compiler will move the early return outside of the called function, basically the functions is partially inlined * however lto/amalgamation needed for the optimization

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• mp_copy.c

• #include "tommath_private.h"
  #ifdef MP_COPY_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* copy, b = a */
  mp_err mp_copy(const mp_int *a, mp_int *b)
  {
     mp_err err;
  
     /* if dst == src do nothing */
     if (a == b) {
        return MP_OKAY;
     }
  
     /* grow dest */
     if ((err = mp_grow(b, a->used)) != MP_OKAY) {
        return err;
     }
  
     /* copy everything over and zero high digits */
     s_mp_copy_digs(b->dp, a->dp, a->used);
     s_mp_zero_digs(b->dp + a->used, b->used - a->used);
     b->used = a->used;
     b->sign = a->sign;
  
     return MP_OKAY;
  }
  #endif
  

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