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/* rounding.c -- file for functions iterating over rounding modes.
Copyright (C) 2013, 2014 INRIA
This file is part of GNU MPC.
GNU MPC is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see http://www.gnu.org/licenses/ .
*/
#include "mpc-tests.h"
/* helper functions for iterating over mpfr rounding modes */
#define FIRST_MPFR_RND_MODE MPFR_RNDN
static mpfr_rnd_t
next_mpfr_rnd_mode (mpfr_rnd_t curr)
{
switch (curr)
{
case MPFR_RNDN:
return MPFR_RNDZ;
case MPFR_RNDZ:
return MPFR_RNDU;
case MPFR_RNDU:
return MPFR_RNDD;
default:
/* return invalid guard value in mpfr_rnd_t */
#if MPFR_VERSION_MAJOR < 3
return MPFR_RNDNA;
#else
return MPFR_RNDA; /* valid rounding type, but not used in mpc */
#endif
}
}
static int
is_valid_mpfr_rnd_mode (mpfr_rnd_t curr)
/* returns 1 if curr is a valid rounding mode, and 0 otherwise */
{
if ( curr == MPFR_RNDN || curr == MPFR_RNDZ
|| curr == MPFR_RNDU || curr == MPFR_RNDD)
return 1;
else
return 0;
}
static mpc_rnd_t
next_mpc_rnd_mode (mpc_rnd_t rnd)
{
mpfr_rnd_t rnd_re = MPC_RND_RE (rnd);
mpfr_rnd_t rnd_im = MPC_RND_IM (rnd);
rnd_im = next_mpfr_rnd_mode (rnd_im);
if (!is_valid_mpfr_rnd_mode (rnd_im))
{
rnd_re = next_mpfr_rnd_mode (rnd_re);
rnd_im = FIRST_MPFR_RND_MODE;
}
return MPC_RND(rnd_re, rnd_im);
}
static int
is_valid_mpc_rnd_mode (mpc_rnd_t rnd)
/* returns 1 if curr is a valid rounding mode, and 0 otherwise */
{
mpfr_rnd_t rnd_re = MPC_RND_RE (rnd);
mpfr_rnd_t rnd_im = MPC_RND_IM (rnd);
return is_valid_mpfr_rnd_mode (rnd_re) && is_valid_mpfr_rnd_mode (rnd_im);
}
/* functions using abstract parameters */
static void
first_mode (mpc_fun_param_t *params, int index)
{
switch (params->T[index])
{
case MPC_RND:
params->P[index].mpc_rnd =
MPC_RND(FIRST_MPFR_RND_MODE, FIRST_MPFR_RND_MODE);
break;
case MPFR_RND:
params->P[index].mpfr_rnd = FIRST_MPFR_RND_MODE;
break;
default:
printf ("The rounding mode is expected to be"
" the last input parameter.\n");
exit (-1);
}
}
static void
next_mode (mpc_fun_param_t *params, int index)
{
switch (params->T[index])
{
case MPC_RND:
params->P[index].mpc_rnd =
next_mpc_rnd_mode (params->P[index].mpc_rnd);
break;
case MPFR_RND:
params->P[index].mpfr_rnd =
next_mpfr_rnd_mode (params->P[index].mpfr_rnd);
break;
default:
printf ("The rounding mode is expected to be"
" the last input parameter.\n");
exit (-1);
}
}
static int
is_valid_mode (mpc_fun_param_t *params, int index)
/* returns 1 if params->P[index] is a valid rounding mode, and 0 otherwise */
{
switch (params->T[index])
{
case MPC_RND:
return is_valid_mpc_rnd_mode (params->P[index].mpc_rnd);
case MPFR_RND:
return is_valid_mpfr_rnd_mode (params->P[index].mpfr_rnd);
default:
printf ("The rounding mode is expected to be"
" the last input parameter.\n");
exit (-1);
}
}
void
first_rnd_mode (mpc_fun_param_t *params)
{
int rnd_mode_index;
for (rnd_mode_index = params->nbout + params->nbin - params->nbrnd;
rnd_mode_index < params->nbout + params->nbin;
rnd_mode_index++)
{
first_mode (params, rnd_mode_index);
}
}
void
next_rnd_mode (mpc_fun_param_t *params)
/* cycle through all valid rounding modes and finish with an invalid one */
{
int last = params->nbout + params->nbin - 1;
int index = params->nbout + params->nbin - params->nbrnd;
int carry = 1;
while (carry && index <= last) {
next_mode (params, index);
if (!is_valid_mode (params, index) && index < last)
first_mode (params, index);
else
carry = 0;
index++;
}
}
int
is_valid_rnd_mode (mpc_fun_param_t *params)
/* returns 1 if all rounding parameters are set to a valid rounding mode,
and 0 otherwise */
{
int index;
for (index = params->nbout + params->nbin - params->nbrnd;
index < params->nbout + params->nbin;
index++)
if (! is_valid_mode (params, index))
return 0;
return 1;
}
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