static void
check_overflow (void)
{
mpfr_t x, y, z1, z2;
mpfr_exp_t emin, emax;
emin = mpfr_get_emin ();
emax = mpfr_get_emax ();
set_emin (-1021);
set_emax (1024);
mpfr_inits (x, y, z1, z2, (mpfr_ptr) 0);
mpfr_set_str1 (x, "8.00468257869324898448e+307");
mpfr_set_str1 (y, "7.44784712422708645156e+307");
mpfr_add1sp (z1, x, y, MPFR_RNDN);
mpfr_add1 (z2, x, y, MPFR_RNDN);
if (mpfr_cmp (z1, z2))
{
printf ("Overflow bug in add1sp.\n");
exit (1);
}
mpfr_clears (x, y, z1, z2, (mpfr_ptr) 0);
set_emin (emin);
set_emax (emax);
}
static void
check_random (mpfr_prec_t p)
{
mpfr_t a1,b,c,a2;
int r;
int i, inexact1, inexact2;
mpfr_inits2 (p, a1, b, c, a2, (mpfr_ptr) 0);
for (i = 0 ; i < 500 ; i++)
{
mpfr_urandomb (b, RANDS);
mpfr_urandomb (c, RANDS);
if (MPFR_IS_PURE_FP(b) && MPFR_IS_PURE_FP(c))
{
if (MPFR_GET_EXP(b) < MPFR_GET_EXP(c))
mpfr_swap(b, c);
if (MPFR_IS_PURE_FP(b) && MPFR_IS_PURE_FP(c))
for (r = 0 ; r < MPFR_RND_MAX ; r++)
{
inexact1 = mpfr_add1(a1, b, c, (mpfr_rnd_t) r);
inexact2 = mpfr_add1sp(a2, b, c, (mpfr_rnd_t) r);
if (mpfr_cmp(a1, a2))
STD_ERROR;
if (inexact1 != inexact2)
STD_ERROR2;
}
}
}
mpfr_clears (a1, a2, b, c, (mpfr_ptr) 0);
}
static void
check_special (void)
{
mpfr_t a1,a2,b,c;
int r;
mpfr_prec_t p;
int i = -1, inexact1, inexact2;
mpfr_inits (a1, a2, b, c, (mpfr_ptr) 0);
for (r = 0 ; r < MPFR_RND_MAX ; r++)
{
SET_PREC(53);
mpfr_set_str1 (b, "1@100");
mpfr_set_str1 (c, "1@1");
inexact1 = mpfr_add1(a1, b, c, (mpfr_rnd_t) r);
inexact2 = mpfr_add1sp(a2, b, c, (mpfr_rnd_t) r);
if (mpfr_cmp(a1, a2))
STD_ERROR;
if (inexact1 != inexact2)
STD_ERROR2;
mpfr_set_str_binary (b, "1E53");
mpfr_set_str_binary (c, "1E0");
inexact1 = mpfr_add1(a1, b, c, (mpfr_rnd_t) r);
inexact2 = mpfr_add1sp(a2, b, c, (mpfr_rnd_t) r);
if (mpfr_cmp(a1, a2))
STD_ERROR;
if (inexact1 != inexact2)
STD_ERROR2;
}
mpfr_set_prec (c, 2);
mpfr_set_prec (a1, 2);
mpfr_set_prec (a2, 2);
mpfr_set_str_binary (c, "1.0e1");
mpfr_set_str_binary (a2, "1.1e-1");
mpfr_set_str_binary (a1, "0.11E2");
mpfr_add1sp (a2, c, a2, MPFR_RNDN);
if (mpfr_cmp (a1, a2))
{
printf ("Regression reuse test failed!\n");
exit (1);
}
mpfr_clears (a1, a2, b, c, (mpfr_ptr) 0);
}
int
mpfr_sub (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mpfr_rnd_t rnd_mode)
{
MPFR_LOG_FUNC (("b[%#R]=%R c[%#R]=%R rnd=%d", b, b, c, c, rnd_mode),
("a[%#R]=%R", a, a));
if (MPFR_ARE_SINGULAR (b,c))
{
if (MPFR_IS_NAN (b) || MPFR_IS_NAN (c))
{
MPFR_SET_NAN (a);
MPFR_RET_NAN;
}
else if (MPFR_IS_INF (b))
{
if (!MPFR_IS_INF (c) || MPFR_SIGN (b) != MPFR_SIGN(c))
{
MPFR_SET_INF (a);
MPFR_SET_SAME_SIGN (a, b);
MPFR_RET (0); /* exact */
}
else
{
MPFR_SET_NAN (a); /* Inf - Inf */
MPFR_RET_NAN;
}
}
else if (MPFR_IS_INF (c))
{
MPFR_SET_INF (a);
MPFR_SET_OPPOSITE_SIGN (a, c);
MPFR_RET (0); /* exact */
}
else if (MPFR_IS_ZERO (b))
{
if (MPFR_IS_ZERO (c))
{
int sign = rnd_mode != MPFR_RNDD
? ((MPFR_IS_NEG(b) && MPFR_IS_POS(c)) ? -1 : 1)
: ((MPFR_IS_POS(b) && MPFR_IS_NEG(c)) ? 1 : -1);
MPFR_SET_SIGN (a, sign);
MPFR_SET_ZERO (a);
MPFR_RET(0); /* 0 - 0 is exact */
}
else
return mpfr_neg (a, c, rnd_mode);
}
else
{
MPFR_ASSERTD (MPFR_IS_ZERO (c));
return mpfr_set (a, b, rnd_mode);
}
}
MPFR_ASSERTD (MPFR_IS_PURE_FP (b) && MPFR_IS_PURE_FP (c));
if (MPFR_LIKELY (MPFR_SIGN (b) == MPFR_SIGN (c)))
{ /* signs are equal, it's a real subtraction */
if (MPFR_LIKELY (MPFR_PREC (a) == MPFR_PREC (b)
&& MPFR_PREC (b) == MPFR_PREC (c)))
return mpfr_sub1sp (a, b, c, rnd_mode);
else
return mpfr_sub1 (a, b, c, rnd_mode);
}
else
{ /* signs differ, it's an addition */
if (MPFR_GET_EXP (b) < MPFR_GET_EXP (c))
{ /* exchange rounding modes toward +/- infinity */
int inexact;
rnd_mode = MPFR_INVERT_RND (rnd_mode);
if (MPFR_LIKELY (MPFR_PREC (a) == MPFR_PREC (b)
&& MPFR_PREC (b) == MPFR_PREC (c)))
inexact = mpfr_add1sp (a, c, b, rnd_mode);
else
inexact = mpfr_add1 (a, c, b, rnd_mode);
MPFR_CHANGE_SIGN (a);
return -inexact;
}
else
{
if (MPFR_LIKELY (MPFR_PREC (a) == MPFR_PREC (b)
&& MPFR_PREC (b) == MPFR_PREC (c)))
return mpfr_add1sp (a, b, c, rnd_mode);
else
return mpfr_add1 (a, b, c, rnd_mode);
}
}
}
int
mpfr_add (mpfr_ptr a, mpfr_srcptr b, mpfr_srcptr c, mpfr_rnd_t rnd_mode)
{
MPFR_LOG_FUNC (("b[%#R]=%R c[%#R]=%R rnd=%d", b, b, c, c, rnd_mode),
("a[%#R]=%R", a, a));
if (MPFR_ARE_SINGULAR(b,c))
{
if (MPFR_IS_NAN(b) || MPFR_IS_NAN(c))
{
MPFR_SET_NAN(a);
MPFR_RET_NAN;
}
/* neither b nor c is NaN here */
else if (MPFR_IS_INF(b))
{
if (!MPFR_IS_INF(c) || MPFR_SIGN(b) == MPFR_SIGN(c))
{
MPFR_SET_INF(a);
MPFR_SET_SAME_SIGN(a, b);
MPFR_RET(0); /* exact */
}
else
{
MPFR_SET_NAN(a);
MPFR_RET_NAN;
}
}
else if (MPFR_IS_INF(c))
{
MPFR_SET_INF(a);
MPFR_SET_SAME_SIGN(a, c);
MPFR_RET(0); /* exact */
}
/* now either b or c is zero */
else if (MPFR_IS_ZERO(b))
{
if (MPFR_IS_ZERO(c))
{
/* for round away, we take the same convention for 0 + 0
as for round to zero or to nearest: it always gives +0,
except (-0) + (-0) = -0. */
MPFR_SET_SIGN(a,
(rnd_mode != MPFR_RNDD ?
((MPFR_IS_NEG(b) && MPFR_IS_NEG(c)) ? -1 : 1) :
((MPFR_IS_POS(b) && MPFR_IS_POS(c)) ? 1 : -1)));
MPFR_SET_ZERO(a);
MPFR_RET(0); /* 0 + 0 is exact */
}
return mpfr_set (a, c, rnd_mode);
}
else
{
MPFR_ASSERTD(MPFR_IS_ZERO(c));
return mpfr_set (a, b, rnd_mode);
}
}
MPFR_ASSERTD(MPFR_IS_PURE_FP(b) && MPFR_IS_PURE_FP(c));
if (MPFR_UNLIKELY(MPFR_SIGN(b) != MPFR_SIGN(c)))
{ /* signs differ, it's a subtraction */
if (MPFR_LIKELY(MPFR_PREC(a) == MPFR_PREC(b)
&& MPFR_PREC(b) == MPFR_PREC(c)))
return mpfr_sub1sp(a,b,c,rnd_mode);
else
return mpfr_sub1(a, b, c, rnd_mode);
}
else
{ /* signs are equal, it's an addition */
if (MPFR_LIKELY(MPFR_PREC(a) == MPFR_PREC(b)
&& MPFR_PREC(b) == MPFR_PREC(c)))
if (MPFR_GET_EXP(b) < MPFR_GET_EXP(c))
return mpfr_add1sp(a, c, b, rnd_mode);
else
return mpfr_add1sp(a, b, c, rnd_mode);
else
if (MPFR_GET_EXP(b) < MPFR_GET_EXP(c))
return mpfr_add1(a, c, b, rnd_mode);
else
return mpfr_add1(a, b, c, rnd_mode);
}
}
